Writing a Patent Specification from Scratch: An Independent Inventor's Field Notes
2026-06-22
← Back to BlogLate last year I decided to write a patent specification myself. Not from confidence — from budget. Agency fees for an invention application were eight to fifteen thousand yuan; my project had thirty thousand total. Spending half on paperwork would starve prototyping.\n\nWriting a specification is not writing a product doc. I spent two months, seven drafts, then a patent friend circled so many issues I was embarrassed. If you plan the same path, use this as a checklist.\n\nYou need five parts: technical field, background, invention content, figure description, and embodiments. Missing any invites correction.\n\nTechnical field is one or two sentences. Do not write a thesis intro.\n\nBackground must state prior problems carefully. Do not disparage others. Say a common approach has a inconvenience, not that prior art is bad. Absolute words invite stricter inventive-step scrutiny. I changed all cup lids cannot open one-handed to common screw lids usually need two hands.\n\nInvention content is the technical solution, not marketing. Prefer a device comprising A, B, and C with connection and placement language. Convenient for users is not a technical feature.\n\nIndependent claims should stay broad; put details in dependents as fallback lines. I once stuffed every feature into the independent claim — that digs your own pit.\n\nEmbodiments should be detailed: materials, alternatives, magnets vs springs, snaps vs threads. Each alternative raises the cost of designing around you.\n\nFigures need consistent reference numerals that match the text.\n\nEnablement matters: heating to deform is not enough — temperature, method, material, and degree may be required.\n\nOrder suggestion: write claims first, align the specification to the claims, then draw figures. The specification supports the claims, not the other way around.