Drafting a Patent Specification That Survives: A Practitioner's Guide to Support, Definiteness, and Claim Scope
By Casey Scott McKay ·
The specification is the only part of a patent that cannot be changed after filing, which makes drafting the highest-leverage hour in patent practice. This guide walks it in fourteen stages: interview for the technical improvement, plan claim scope before writing prose, draft the claims first, build the claim ladder, then write each section of the specification against the claims it must support, disclose an algorithm for every function, handle ranges and genus language, and run a support map before filing. It explains why the background section is a liability, what a prophetic example can and cannot do, how to write for continuations you will file years later, and which drafting habits reliably produce invalid claims. Worked before-and-after language runs throughout. The companion article supplies the doctrine and the companion checklist the pre-filing verification.
IP and Technology > Patent Counseling Transactions | Guide | Published 27 June 2024 - Updated 23 February 2026 | Casey Scott McKay - marksy.us
Summary. The specification is the only part of a patent that cannot be changed after filing, which makes drafting the highest-leverage hour in patent practice. This guide walks it in fourteen stages: interview for the technical improvement, plan claim scope before writing prose, draft the claims first, build the claim ladder, then write each section of the specification against the claims it must support, disclose an algorithm for every function, handle ranges and genus language, and run a support map before filing. It explains why the background section is a liability, what a prophetic example can and cannot do, how to write for continuations you will file years later, and which drafting habits reliably produce invalid claims. Worked before-and-after language runs throughout. The companion article supplies the doctrine and the companion checklist the pre-filing verification.
Keywords: patent drafting, specification, claim drafting, written description, enablement, definiteness, algorithm disclosure, claim ladder, embodiments, background section, summary section, figures, glossary, antecedent basis, dependent claims, Markush groups, ranges, prophetic examples, continuation strategy, support mapping
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