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