Patent Prosecution Strategy

Patent prosecution strategy refers to the deliberate decisions made during the patent application process — from initial drafting through examination, appeal, and post-issuance — to maximize the value, breadth, and enforceability of the resulting patent portfolio. Key strategic decisions include: (1) Claim scope and structure: how broad to draft independent claims, how many dependent claims to include, and which statutory categories (method, apparatus, system) to cover. (2) Specification drafting: how to describe the invention broadly enough to support future continuation claims while providing enough detail to satisfy written description and enablement requirements. (3) Office action response approach: when to argue without amending (preserving full claim scope), when to amend (trading scope for allowance), and when to file an RCE, appeal, or continuation. (4) Continuation and divisional timing: when to file continuation applications to pursue broader claims, track competitor products, or build out a patent family. (5) Prosecution timeline: whether to use Track One, PPH, or examiner interviews to accelerate examination, and how to balance speed with thoroughness. Good prosecution strategy aligns the patent application process with business objectives: getting the broadest defensible claims in the shortest time and at the lowest cost, while preserving the flexibility to cover new product variants and competitive threats through continuations.

You should consider filing a continuation application whenever: (1) Your product or business strategy has evolved since the original filing, and the issued claims don't cover the current product well enough. A continuation lets you draft new claims specifically targeting your product in the language that appears in the specification. (2) You want to track a competitor's product. Once you identify that a competitor's product uses a feature described in your specification, file a continuation with claims written in the competitor's own product language (based on published descriptions, patents, or marketing materials). The original specification supports the claims; the continuation targets the competitor specifically. (3) Your parent application is about to issue with narrower claims than you'd like — file the continuation before issuance to keep prosecution alive for broader claims. (4) The examiner has allowed claims in the parent but rejected others — file a continuation to continue pursuing the rejected claims independently. Key rules: (a) A continuation must be filed before the parent patent issues or goes abandoned — not the day after. (b) A continuation can claim any subject matter fully supported by the parent specification — no new matter. (c) A continuation is entitled to the parent's filing date for all claims. (d) Terminal disclaimers may be needed to avoid obviousness-type double patenting rejections between related applications. Strategically, file at least one continuation before every important application issues. The cost is modest; the lost opportunity if you don't is permanent.

The argue-vs.-amend decision is central to prosecution strategy because amendments create prosecution history estoppel that narrows the enforceable scope of your patent permanently. The general principle: argue first, amend only if necessary. Argue when: (1) the examiner has misread the prior art reference — point to the specific element the reference does not disclose; (2) the examiner has used an incorrect claim construction — show the correct construction and how the reference still doesn't anticipate or render obvious; (3) the examiner has improperly combined references — attack the motivation to combine, teaching away, or lack of reasonable expectation of success; (4) the examiner's § 101 characterization is wrong — the claim is not directed to the identified abstract idea, or it integrates a practical application. Amend when: (1) the prior art clearly discloses most claim elements and you need a genuine distinguishing limitation; (2) the specification supports a specific limitation that would distinguish the art AND cover your embodiment; (3) you have conducted an examiner interview and identified specific claim language the examiner indicated would lead to allowance. When you must amend: add only the minimum necessary limitation. Document in the remarks exactly what the amendment does and does not surrender. If possible, add the limitation to a dependent claim first and argue the independent claim separately — this preserves the independent claim's broader scope while adding the fallback. Never amend in a way that writes out your actual product or preferred embodiment from the claims.

The Patent Prosecution Highway (PPH) is a bilateral and multilateral program that allows applicants to fast-track examination in a second patent office by leveraging a favorable examination result from a first patent office. How it works: if you file a PCT application (or a direct national filing) and the first office of examination (OEE) — which could be the USPTO, EPO, JPO, or any of ~40 participating offices — allows at least one claim or finds claims to be patentable, you can request PPH in any other participating office where you have a corresponding application. The second office (OPE — Office of Perusal and Examination) will advance the application out of the normal examination queue and examine it on an expedited basis. The PPH request typically includes: a copy of the office action or decision from the OEE showing allowed or patentable claims, a copy of the allowed/patentable claims, and a claim correspondence table showing how the claims in the OPE application correspond to the allowed claims. The OPE examiner is supposed to give weight to the OEE's prior work. In practice, PPH applications are examined much faster — often within 3–6 months of the PPH request, compared to 18–30+ months in normal examination. For startups and applicants who need issued patents quickly and have a PCT application with a favorable international search report, requesting PPH in the U.S. national phase (using the PCT as the PPH basis) is one of the most cost-effective acceleration options — it has no surcharge beyond the normal USPTO fees.

There is no statutory limit on the number of continuations you can file from a parent application, but practical and cost considerations guide the decision. The USPTO has considered, but not implemented, rules limiting continuation chains. Under current rules, you can maintain a continuation chain for the life of the original patent — a continuation filed the day before the parent issues can itself spawn more continuations after it issues, as long as each is filed before its immediate parent issues. How many to file: for a startup with a core product: file at least 2–3 continuations from every key application before it issues — one targeting the core product claims broadly, one targeting specific features identified as competitive differentiators, and one with claims written in competitor language if you've identified infringers. For an established company's portfolio: file continuations continuously on high-value patent families, targeting new product versions, new use cases, and new competitive threats as they emerge. Large tech companies maintain continuation chains on core patent families for 15–20 years, issuing patents throughout the family's life. Budget consideration: each continuation costs the same as a new application filing — roughly $2,000–$10,000 in USPTO fees plus attorney time. For a patent that covers a high-revenue product, the cost of maintaining 3–5 continuations is trivial compared to the licensing or litigation value. For a patent on a minor feature, even one continuation may not be warranted. Key discipline: review your application pipeline before every parent issues and make a deliberate decision about whether to file a continuation — don't let important applications issue without considering it.