Answer with Invalidity Contentions
Combined answer and Patent Local Rule 3-3 invalidity contentions for a patent defendant — responds to each complaint allegation while building the invalidity record for trial.
Prerequisites
- Complaint — all numbered paragraphs requiring response
- Asserted patent(s) — specification, claims, and prosecution history
- Prior art — patents, publications, products, or public uses with qualifying dates
- Jurisdiction — district court and applicable local patent rules (PLR 3-3 or equivalent)
- Effective filing date — pre-AIA (before March 16, 2013) vs. AIA § 102 framework
- Accused product/method — for non-infringement admissions and denials
Output Structure
1. Caption and Introduction
- Full party names, civil action number, division
- Title: DEFENDANT'S ANSWER AND INVALIDITY CONTENTIONS
- Jury demand if not previously filed (FRCP 38)
- Opening denial of infringement of any valid, enforceable claim
2. Admissions and Denials (FRCP 8(b))
Respond paragraph-by-paragraph mirroring complaint numbering.
| Response |
When |
Language |
| Admit |
Verifiable facts (jurisdiction, patent issuance) |
"Defendant admits U.S. Patent No. X was issued on [date]." |
| Admit in part / Deny in part |
Mixed fact and legal conclusion |
"Admits it manufactures [product]; denies infringement of any valid claim." |
| Lack of knowledge (8(b)(5)) |
Within plaintiff's peculiar knowledge |
"Lacks sufficient knowledge; treated as denial." |
| Deny |
False facts and all legal conclusions |
"Defendant denies." |
- Address each sub-part of compound paragraphs individually
- Close: "All allegations not expressly admitted are denied." (FRCP 8(b)(6))
3. Affirmative Defenses
Number separately. Apply Twombly/Iqbal plausibility with brief factual predicates.
| # |
Defense |
Notes |
| 1 |
Non-infringement |
Literal and DOE |
| 2 |
Invalidity — §§ 101, 102, 103, 112 |
Claim charts in § 5; pled in alternative |
| 3 |
Inequitable conduct |
FRCP 9(b) particularity; reserved pending discovery |
| 4 |
Prosecution laches / Equitable estoppel |
If prosecution history supports |
| 5 |
License / Exhaustion |
If authorized sale or course of dealing |
| 6 |
Failure to state a claim |
Missing claim specificity |
| 7 |
Statute of limitations |
35 U.S.C. § 286 (6-year bar) |
| 8 |
Unclean hands / Waiver |
As facts support |
Defenses not raised may be waived under FRCP 8(c) — err toward inclusion.
4. Counterclaims (if applicable)
- DJ of non-infringement (28 U.S.C. § 2201)
- DJ of invalidity
- State jurisdictional basis separately
5. Invalidity Contentions
Each contention requires: (a) reference identification, (b) prior art qualification, (c) claim chart.
Reference header: Title, authors/inventors, publication date, publisher/assignee, patent or publication number, prior art basis (AIA § 102(a)(1)/(a)(2) or pre-AIA § 102(a)/(b)/(e)/(g)).
§ 102 — Anticipation
One chart per reference per claim. Map every limitation.
| Claim Limitation |
Prior Art Disclosure (col:line or pg:¶) |
Analysis |
| [Preamble] |
[Ref. p. X, ¶ Y] |
[Disclosure explanation] |
| [Element 1a] |
[Ref. col. 3:12–25] |
[Mapping] |
- Patents: presumed enabling
- NPL: address In re Wands enablement factors
- Show anticipation under any reasonable claim construction
§ 103 — Obviousness
Apply Graham v. John Deere (scope of art, differences, POSITA level, objective indicia). Motivation to combine per KSR v. Teleflex: explicit suggestion, problem-solution, obvious to try, known elements in established functions.
| Claim Limitation |
Primary Ref. |
Secondary Ref. |
Combination Rationale |
| [Element 1a] |
Ref. A, col. 2:10 |
— |
Taught by A alone |
| [Element 1b] |
— |
Ref. B, p. 5 |
POSITA would combine: [motivation] |
Rebut secondary considerations: commercial success (non-claimed features), long-felt need (art already suggested), failure of others (lack of motivation), unexpected results (predictable to POSITA).
§ 112 Contentions
| Ground |
Standard |
Identify |
| § 112(a) Written description |
Inventor possessed full claim scope at filing |
Broad terms unsupported by spec |
| § 112(a) Enablement |
No undue experimentation (Wands factors) |
Claim breadth vs. spec disclosure |
| § 112(b) Indefiniteness |
Reasonably certain to POSITA (Nautilus v. Biosig) |
Subjective/relative terms, unbounded functional language |
| § 112(f) Means-plus-function |
Spec must disclose corresponding structure |
Nonce words without disclosed structure |
§ 101 — Subject Matter Eligibility (if applicable)
Alice/Mayo two-step: (1) directed to abstract idea, law of nature, or natural phenomenon? (2) inventive concept beyond routine/conventional activity?
6. Prayer for Relief
- No infringement of any valid, enforceable claim
- All asserted claims invalid under §§ 101, 102, 103, 112
- Patent unenforceable (if inequitable conduct pled)
- Dismissal with prejudice; costs and fees under § 285
- Declaratory relief; such other relief as the Court deems proper
7. Signature Block (FRCP 11)
- Attorney name, bar number, firm, address, contact
- Check local rules for corporate verification requirements
Guidelines
- Completeness — Federal Circuit may preclude invalidity theories omitted from initial contentions; PLR 3-3 omissions can be fatal at trial
- Concurrent production — prior art references must be produced to plaintiff with service of contentions (unless publicly available)
- Page limits — most districts cap at 35–50 pages; check local rules
- Pre-AIA vs. AIA — confirm effective filing date; pre-AIA § 102 subsections differ materially from AIA § 102(a)(1)/(a)(2)
- Internal consistency — admitted facts in § 2 must not contradict predicates in § 3 or § 5
- Verify citations — confirm statute versions, case holdings, and local PLR numbering for the specific district [VERIFY]
- Scope — U.S. federal courts only; ITC proceedings use different procedural rules
1---2name: answer-with-invalidity-contentions3description: Drafts a defendant's Answer with Invalidity Contentions responding to a U.S. patent infringement complaint. Covers FRCP 8(b) admissions/denials, affirmative defenses, and PLR 3-3 invalidity contentions with claim charts under 35 U.S.C. §§ 101, 102, 103, 112. Use when representing a defendant in the pleadings phase of federal patent litigation who must respond to an infringement suit and assert prior art, anticipation, obviousness, or § 112 defenses.4---5
6# Answer with Invalidity Contentions
7
8Combined answer and Patent Local Rule 3-3 invalidity contentions for a patent defendant — responds to each complaint allegation while building the invalidity record for trial.
9
10## Prerequisites
11
121. **Complaint** — all numbered paragraphs requiring response
132. **Asserted patent(s)** — specification, claims, and prosecution history
143. **Prior art** — patents, publications, products, or public uses with qualifying dates
154. **Jurisdiction** — district court and applicable local patent rules (PLR 3-3 or equivalent)
165. **Effective filing date** — pre-AIA (before March 16, 2013) vs. AIA § 102 framework
176. **Accused product/method** — for non-infringement admissions and denials
18
19## Output Structure
20
21### 1. Caption and Introduction
22- Full party names, civil action number, division
23- Title: DEFENDANT'S ANSWER AND INVALIDITY CONTENTIONS
24- Jury demand if not previously filed (FRCP 38)
25- Opening denial of infringement of any valid, enforceable claim
26
27### 2. Admissions and Denials (FRCP 8(b))
28
29Respond paragraph-by-paragraph mirroring complaint numbering.
30
31| Response | When | Language |
32|---|---|---|
33| Admit | Verifiable facts (jurisdiction, patent issuance) | "Defendant admits U.S. Patent No. X was issued on [date]." |
34| Admit in part / Deny in part | Mixed fact and legal conclusion | "Admits it manufactures [product]; denies infringement of any valid claim." |
35| Lack of knowledge (8(b)(5)) | Within plaintiff's peculiar knowledge | "Lacks sufficient knowledge; treated as denial." |
36| Deny | False facts and all legal conclusions | "Defendant denies." |
37
38- Address each sub-part of compound paragraphs individually
39- Close: "All allegations not expressly admitted are denied." (FRCP 8(b)(6))
40
41### 3. Affirmative Defenses
42
43Number separately. Apply Twombly/Iqbal plausibility with brief factual predicates.
44
45| # | Defense | Notes |
46|---|---|---|
47| 1 | Non-infringement | Literal and DOE |
48| 2 | Invalidity — §§ 101, 102, 103, 112 | Claim charts in § 5; pled in alternative |
49| 3 | Inequitable conduct | FRCP 9(b) particularity; reserved pending discovery |
50| 4 | Prosecution laches / Equitable estoppel | If prosecution history supports |
51| 5 | License / Exhaustion | If authorized sale or course of dealing |
52| 6 | Failure to state a claim | Missing claim specificity |
53| 7 | Statute of limitations | 35 U.S.C. § 286 (6-year bar) |
54| 8 | Unclean hands / Waiver | As facts support |
55
56Defenses not raised may be waived under FRCP 8(c) — err toward inclusion.
57
58### 4. Counterclaims (if applicable)
59- DJ of non-infringement (28 U.S.C. § 2201)
60- DJ of invalidity
61- State jurisdictional basis separately
62
63### 5. Invalidity Contentions
64
65Each contention requires: (a) reference identification, (b) prior art qualification, (c) claim chart.
66
67**Reference header:** Title, authors/inventors, publication date, publisher/assignee, patent or publication number, prior art basis (AIA § 102(a)(1)/(a)(2) or pre-AIA § 102(a)/(b)/(e)/(g)).
68
69#### § 102 — Anticipation
70
71One chart per reference per claim. Map every limitation.
72
73| Claim Limitation | Prior Art Disclosure (col:line or pg:¶) | Analysis |
74|---|---|---|
75| [Preamble] | [Ref. p. X, ¶ Y] | [Disclosure explanation] |
76| [Element 1a] | [Ref. col. 3:12–25] | [Mapping] |
77
78- Patents: presumed enabling
79- NPL: address In re Wands enablement factors
80- Show anticipation under any reasonable claim construction
81
82#### § 103 — Obviousness
83
84Apply Graham v. John Deere (scope of art, differences, POSITA level, objective indicia). Motivation to combine per KSR v. Teleflex: explicit suggestion, problem-solution, obvious to try, known elements in established functions.
85
86| Claim Limitation | Primary Ref. | Secondary Ref. | Combination Rationale |
87|---|---|---|---|
88| [Element 1a] | Ref. A, col. 2:10 | — | Taught by A alone |
89| [Element 1b] | — | Ref. B, p. 5 | POSITA would combine: [motivation] |
90
91**Rebut secondary considerations:** commercial success (non-claimed features), long-felt need (art already suggested), failure of others (lack of motivation), unexpected results (predictable to POSITA).
92
93#### § 112 Contentions
94
95| Ground | Standard | Identify |
96|---|---|---|
97| § 112(a) Written description | Inventor possessed full claim scope at filing | Broad terms unsupported by spec |
98| § 112(a) Enablement | No undue experimentation (Wands factors) | Claim breadth vs. spec disclosure |
99| § 112(b) Indefiniteness | Reasonably certain to POSITA (Nautilus v. Biosig) | Subjective/relative terms, unbounded functional language |
100| § 112(f) Means-plus-function | Spec must disclose corresponding structure | Nonce words without disclosed structure |
101
102#### § 101 — Subject Matter Eligibility (if applicable)
103
104Alice/Mayo two-step: (1) directed to abstract idea, law of nature, or natural phenomenon? (2) inventive concept beyond routine/conventional activity?
105
106### 6. Prayer for Relief
107- No infringement of any valid, enforceable claim
108- All asserted claims invalid under §§ 101, 102, 103, 112
109- Patent unenforceable (if inequitable conduct pled)
110- Dismissal with prejudice; costs and fees under § 285
111- Declaratory relief; such other relief as the Court deems proper
112
113### 7. Signature Block (FRCP 11)
114- Attorney name, bar number, firm, address, contact
115- Check local rules for corporate verification requirements
116
117## Guidelines
118
119- **Completeness** — Federal Circuit may preclude invalidity theories omitted from initial contentions; PLR 3-3 omissions can be fatal at trial
120- **Concurrent production** — prior art references must be produced to plaintiff with service of contentions (unless publicly available)
121- **Page limits** — most districts cap at 35–50 pages; check local rules
122- **Pre-AIA vs. AIA** — confirm effective filing date; pre-AIA § 102 subsections differ materially from AIA § 102(a)(1)/(a)(2)
123- **Internal consistency** — admitted facts in § 2 must not contradict predicates in § 3 or § 5
124- **Verify citations** — confirm statute versions, case holdings, and local PLR numbering for the specific district [VERIFY]
125- **Scope** — U.S. federal courts only; ITC proceedings use different procedural rules
CaseMark