United States

A US utility patent application typically includes: - Specification (Background, Detailed Description, and Best Mode) - Claims - Drawings (if applicable) - Abstract - Declarations (e.g., Inventor's Declaration, ADS) If claiming foreign priority, priority documents must typically be submitted within 4 months of filing or the date of final action (whichever is later), using PDX or DAS. **Key points:** - US applications must name the actual inventor(s), not just the rights holder (assignee). - All co-inventors must be named.

Source: USPTO patent application procedure; 37 CFR Part 1

US patents come in three types: **Utility Patent:** The most common — protects functional inventions. Valid for 20 years; subject to Maintenance Fees. **Design Patent:** Protects the ornamental or aesthetic design of a product. Valid for 15 years (for applications filed after May 13, 2015); no Maintenance Fees. **Plant Patent:** Protects specific asexually reproduced plant varieties. Valid for 20 years; no Maintenance Fees. **Provisional Application:** Not a patent itself — used to establish a priority date, giving the applicant 12 months to file a formal non-provisional application. A provisional does not grant any patent rights.

Source: 35 USC; USPTO patent types overview

US utility patents are valid for 20 years from the filing date. For pharmaceuticals and medical devices subject to regulatory approval delays, the Hatch-Waxman Act allows patent term extension (PTE) of up to 5 years, though the remaining term after approval may not exceed 14 years. USPTO also calculates Patent Term Adjustment (PTA) to compensate for unreasonable delays during examination.

Source: 35 USC §154, §156; USPTO PTA/PTE guidelines

After AIA, the US retains a 12-month grace period for disclosures by the inventor or those who obtained the disclosure from the inventor. Disclosures made within 12 months of the filing date will not destroy novelty. **This differs significantly from absolute novelty jurisdictions (e.g., Europe, China), with important caveats:** - The grace period only protects the inventor's own disclosures, not independent third-party disclosures. - A third party independently disclosing the same invention during the grace period may create rights competition. - For international filings, plan according to the strictest novelty standard (absolute novelty).

Source: 35 USC §102(b); USPTO AIA guidance

Typical US utility patent process: 1. **File application** — Submit non-provisional application (or provisional first, then non-provisional within 12 months) 2. **Formal examination** — USPTO checks format and completeness 3. **Publication** — Applications typically publish automatically 18 months after filing; applicants can request early publication or non-publication (subject to conditions) 4. **Assigned to examiner, enters queue** — No separate examination request needed; applications automatically enter substantive examination 5. **Substantive examination** — USPTO examiner issues Office Action (OA) 6. **Response to OA** — Applicant must respond within the deadline; claims can be amended 7. **Allowance or final rejection** — If allowed, a Notice of Allowance is issued; if finally rejected, options include RCE or appeal 8. **Issue fee** — Pay the issue fee after allowance; maintenance fees follow **Key maintenance fee deadlines:** - 3.5 years after grant: First maintenance fee - 7.5 years after grant: Second maintenance fee - 11.5 years after grant: Third maintenance fee Failure to pay results in expiration (6-month grace period available with a surcharge).

Source: USPTO patent examination procedure; 37 CFR Part 1

A distinguishing feature of the US patent system is the continuation application framework, allowing applicants to file new applications based on a pending original application: - **Continuation:** Based on the original application with shared subject matter; claims can differ. - **Continuation-in-Part (CIP):** Adds new subject matter on top of the original. - **Divisional:** Splits the original application into separate applications covering different inventions when required by a restriction requirement from USPTO. This framework lets applicants continuously adjust their protection strategy throughout the examination cycle — a key strategic tool in US patent prosecution.

Source: 37 CFR §1.53; USPTO patent continuation practice

US patent applicants have a duty to disclose all known material prior art to the USPTO, typically via an Information Disclosure Statement (IDS). **This obligation is mandatory in the US:** - Binds applicants, agents, and attorneys - Failure to disclose known material prior art can render a patent unenforceable due to inequitable conduct **Practical note:** - If the applicant has received search reports or office actions in other jurisdictions (e.g., EPO), these typically must be reported to the USPTO via IDS. - IDS must be submitted at specific stages before allowance; late submissions require meeting additional conditions and paying a fee.

Source: 37 CFR §1.56; MPEP Chapter 2000

USPTO examination timelines vary significantly by technology field, application volume, and examiner backlog: - First OA: approximately 12–24 months - Overall allowance timeline (including responses): approximately 2–4 years **PPH (Patent Prosecution Highway):** USPTO has bilateral PPH agreements with many major offices. When conditions are met (e.g., positive outcome in another jurisdiction), accelerated examination can typically reduce the timeline to within 12 months. **Track One (Prioritized Examination):** USPTO's fast-track program typically completes examination in 6–12 months with additional fees. Annual capacity is limited.

Source: USPTO examination timeline statistics; USPTO PPH information

The USPTO supports WIPO DAS (Digital Access Service for Priority Documents). USPTO is a DAS participating office. Priority documents from USPTO filings can be electronically requested via DAS without needing certified paper copies.

Source: WIPO DAS official page; USPTO Priority Document Exchange

US utility patents require three maintenance fee payments: - First maintenance fee: 3.5 years after grant (6-month grace period) - Second maintenance fee: 7.5 years after grant (6-month grace period) - Third maintenance fee: 11.5 years after grant (6-month grace period) Late payments within the grace period require a surcharge. If unpaid after the grace period, the patent expires but can potentially be revived via a Petition to Revive if the delay was unintentional. **Design and plant patents do NOT require maintenance fees.**

Source: 37 CFR §1.362; USPTO fee schedule