# PatentBrief Free Patent Tools 31 free interactive tools for inventors, founders, and engineers. All are free and require no account. ## [Which IP Do I Need?](https://patentbrief.org/tools/which-ip) Patent, trademark, copyright, or trade secret — which fits your situation. URL: https://patentbrief.org/tools/which-ip ## [Is My Idea Patentable?](https://patentbrief.org/tools/patentability) Run an idea through novelty, non-obviousness, utility, and eligibility. URL: https://patentbrief.org/tools/patentability ## [Patent Eligibility Check (§101)](https://patentbrief.org/tools/eligibility-check) Walk the Alice/Mayo two-step to test §101 eligibility. URL: https://patentbrief.org/tools/eligibility-check ## [Prior Art Search Starter](https://patentbrief.org/tools/prior-art-search) Build a structured prior-art search plan with queries and links. URL: https://patentbrief.org/tools/prior-art-search ## [Patent ROI Calculator](https://patentbrief.org/tools/patent-roi) Decide whether filing is worth it for your invention. URL: https://patentbrief.org/tools/patent-roi ## [Patent Cost Calculator](https://patentbrief.org/tools/patent-cost) Estimate the all-in cost of a patent by entity size and complexity. URL: https://patentbrief.org/tools/patent-cost ## [USPTO Entity Status](https://patentbrief.org/tools/entity-status) Micro, small, or large entity — which USPTO fee tier applies. URL: https://patentbrief.org/tools/entity-status ## [Inventorship Determiner](https://patentbrief.org/tools/inventorship) Who legally counts as an inventor — and who doesn't. URL: https://patentbrief.org/tools/inventorship ## [Patent Claim Builder](https://patentbrief.org/tools/claim-builder) Draft a well-formed independent claim element by element. URL: https://patentbrief.org/tools/claim-builder ## [Patent Claim Checker](https://patentbrief.org/tools/claim-checker) Lint a draft claim for the §112 issues examiners reject on. URL: https://patentbrief.org/tools/claim-checker ## [Claim Support Checker (§112)](https://patentbrief.org/tools/claim-support) Check that each claim term is described in the specification. URL: https://patentbrief.org/tools/claim-support ## [Provisional Patent Generator](https://patentbrief.org/tools/provisional-builder) Draft a structured provisional application fast. URL: https://patentbrief.org/tools/provisional-builder ## [Invention Disclosure Builder](https://patentbrief.org/tools/invention-disclosure) Capture an invention on the record before seeing an attorney. URL: https://patentbrief.org/tools/invention-disclosure ## [Patent Claim Explainer](https://patentbrief.org/tools/explain-claim) Turn dense claim language into plain English. URL: https://patentbrief.org/tools/explain-claim ## [Office Action Deadline Calculator](https://patentbrief.org/tools/office-action) Response deadlines and extension fees for an Office Action. URL: https://patentbrief.org/tools/office-action ## [Patent Filing Deadline Calculator](https://patentbrief.org/tools/filing-timeline) Plot the key pre-grant deadlines from your filing date. URL: https://patentbrief.org/tools/filing-timeline ## [Claim Dependency Mapper](https://patentbrief.org/tools/claim-tree) Map claim dependencies and tally excess-claim fees. URL: https://patentbrief.org/tools/claim-tree ## [Claim Chart / FTO Tool](https://patentbrief.org/tools/claim-chart) Map a claim against a product for infringement or freedom-to-operate. URL: https://patentbrief.org/tools/claim-chart ## [Patent Claim Diff](https://patentbrief.org/tools/claim-diff) Word-level redline between two versions of a claim. URL: https://patentbrief.org/tools/claim-diff ## [Cease & Desist Response Triage](https://patentbrief.org/tools/c-and-d) Severity, posture, defenses, and next steps for a patent assertion letter. URL: https://patentbrief.org/tools/c-and-d ## [PCT International Filing Planner](https://patentbrief.org/tools/pct-strategy) Route, priority countries, cost, and 30-month timeline for foreign filings. URL: https://patentbrief.org/tools/pct-strategy ## [Freedom-to-Operate Risk Snapshot](https://patentbrief.org/tools/fto-snapshot) Risk score, CPC classes, search strategy, and FTO depth before you ship. URL: https://patentbrief.org/tools/fto-snapshot ## [Patent Value Estimator](https://patentbrief.org/tools/patent-value) A heuristic estimate of what a patent is worth. URL: https://patentbrief.org/tools/patent-value ## [Patent Strength Scorecard](https://patentbrief.org/tools/patent-strength) Grade a patent A+ to F across five axes. URL: https://patentbrief.org/tools/patent-strength ## [Patent Expiry Calculator](https://patentbrief.org/tools/patent-expiry) When a patent lapses, with maintenance-fee deadlines (GATT-aware). URL: https://patentbrief.org/tools/patent-expiry ## [Patent Term Adjustment Calculator](https://patentbrief.org/tools/patent-term-adjustment) Estimate the §154(b) B-delay that extends a patent's term. URL: https://patentbrief.org/tools/patent-term-adjustment ## [Patent Number Decoder](https://patentbrief.org/tools/patent-number-decoder) Read any patent number — country, type, kind code, and era. URL: https://patentbrief.org/tools/patent-number-decoder ## [Patent Citation Generator](https://patentbrief.org/tools/cite) Cite a patent in Bluebook, APA, MLA, Chicago, IEEE, or BibTeX. URL: https://patentbrief.org/tools/cite ## [Maintenance Fee Schedule](https://patentbrief.org/tools/maintenance-schedule) See a US patent's 3.5, 7.5 & 11.5-year maintenance-fee deadlines. URL: https://patentbrief.org/tools/maintenance-schedule ## [Patent Claim Infringement Check](https://patentbrief.org/tools/claim-infringement-check) AI element-by-element analysis of active patents vs. your product. URL: https://patentbrief.org/tools/claim-infringement-check ## [Prior Art Finder](https://patentbrief.org/tools/prior-art-finder) Semantic AI search for patents similar to your invention. URL: https://patentbrief.org/tools/prior-art-finder --- _Source: PatentBrief — https://patentbrief.org. Free patent tools for inventors, founders, and engineers._