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Patent Law

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Patent law protects inventions by granting an inventor certain exclusive rights for a limited period of time. It is a branch of intellectual property law focused on new and useful inventions — such as products, machines, processes, and improvements — and on encouraging innovation by allowing inventors to benefit from what they create.

To be patentable, an invention generally must meet several requirements: it must be the kind of subject matter that can be patented, it must be new, and it must be more than an obvious variation of what already exists. Obtaining a patent involves a formal application and examination process in which the invention is described and claimed, and a government authority reviews it. Once granted, a patent gives its owner the right to prevent others from making, using, or selling the invented technology without permission, but only for a limited time, after which the invention becomes free for all to use.

Common issues in this field include preparing and prosecuting patent applications, licensing or selling patent rights, evaluating whether a product might infringe an existing patent, and addressing infringement disputes.

For a non-lawyer, the key points are that patents must be applied for and granted — they do not arise automatically — and that they protect specific inventions for a limited period. Inventors and businesses commonly consult patent lawyers to seek protection for an invention, license patent rights, assess infringement risk, or respond to a dispute.

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Related practice areas

Trade Secret LawCopyright LawTrademark LawIntellectual Property Law

Primary law

The governing U.S. Code, statutes and founding documents for Patent Law.

Key definitions

Defined terms that recur in patent law — each links to its dictionary entry.

PatentInfringementClaimsProsecutionNoveltyObviousnessAnticipationLicenseeAssignee

Landmark cases (1)

Landmark cases are the Supreme Court decisions that defined or reshaped Patent Law — establishing the controlling principles courts still apply. Current law leads; where a decision overruled an earlier landmark, the superseded case is shown beneath it.

Key cases of the U.S. Courts of Appeals

The most-cited decisions applying U.S. Code Title 35 (Patents) — beyond the landmark cases above.

Frequently asked questions

Further reading

  • Patents and How to Get One: A Practical Handbook - Hardcover
    Patents and How to Get One: A Practical Handbook - Hardcover
  • Manual of Patent Examining Procedure (Vol.4) - Paperback
    Manual of Patent Examining Procedure (Vol.4) - Paperback
    U. S. Department of Commerce
  • Intellectual Property: A Very Short Introduction - Paperback
    Intellectual Property: A Very Short Introduction - Paperback
    Siva Vaidhyanathan
  • How to patent an Idea in US: From idea to granted Patent in quickest time, saving costs and making money with your patented invention - Paperback
    How to patent an Idea in US: From idea to granted Patent in quickest time, saving costs and making money with your patented invention - Paperback
    Prasad Karhad
  • True Patent Value: Defining Quality in Patents and Patent Portfolios - Paperback
    True Patent Value: Defining Quality in Patents and Patent Portfolios - Paperback
    Larry M. Goldstein
  • The 30 Minute Patent MBA: For Startup CEOs and CTOs - Paperback
    The 30 Minute Patent MBA: For Startup CEOs and CTOs - Paperback
    James Billmaier
  • WIPO Technology Trends 2021 - Assistive technology - Paperback
    WIPO Technology Trends 2021 - Assistive technology - Paperback
    Wipo
  • Just Wanna Patent: The First Steps - Paperback
    Just Wanna Patent: The First Steps - Paperback
    Ricardo Gonzalez
  • U.S. Patent Prosecution for Support Staff: A Desk Reference - Paperback
    U.S. Patent Prosecution for Support Staff: A Desk Reference - Paperback
    Rosaleen A. Walsh
  • World Intellectual Property Indicators 2023 - Paperback
    World Intellectual Property Indicators 2023 - Paperback
    Wipo
  • You Are an IP Company: The 12-Step Plan to Increase Your Intellectual Property Influence, Impact, and Income - Hardcover
    You Are an IP Company: The 12-Step Plan to Increase Your Intellectual Property Influence, Impact, and Income - Hardcover
    Kary Oberbrunner
  • Great Inventions And Discoveries (1911) - Paperback
    Great Inventions And Discoveries (1911) - Paperback
    Willis Duff Piercy
  • The Art of the Patent - Hardcover
    The Art of the Patent - Hardcover
    Kevin Prince
  • Intellectual Property and Public Health in the Developing World - Paperback
    Intellectual Property and Public Health in the Developing World - Paperback
    Monirul Azam
  • Global Biopiracy: Patents, Plants, and Indigenous Knowledge - Paperback
    Global Biopiracy: Patents, Plants, and Indigenous Knowledge - Paperback
    Ikechi Mgbeoji
  • Intellectual Property: From Creation to Commercialisation - A Practical Guide for Innovators & Researchers - Hardcover
    Intellectual Property: From Creation to Commercialisation - A Practical Guide for Innovators & Researchers - Hardcover
    John P. MC Manus
  • All About My Invention: An Inventors Planner & Journal July - September - Paperback
    All About My Invention: An Inventors Planner & Journal July - September - Paperback
    Andrea Hence Evans
  • Nolo's Patents for Beginners - Paperback
    Nolo's Patents for Beginners - Paperback
    David Pressman
  • Are There Laws of Innovation? - Hardcover
    Are There Laws of Innovation? - Hardcover
    Lau Lawrence J
  • Think and Grow Rich for Inventors - Paperback
    Think and Grow Rich for Inventors - Paperback
    John Rizvi
  • The Progress Of Invention In The Nineteenth Century - Paperback
    The Progress Of Invention In The Nineteenth Century - Paperback
    Edward W. Byrn
  • The Venture Capital Alternative: A Blueprint for a Better Patent System - Paperback
    The Venture Capital Alternative: A Blueprint for a Better Patent System - Paperback
    Matt Moyers
  • Patents and How to Get One: A Practical Handbook - Paperback
    Patents and How to Get One: A Practical Handbook - Paperback
    United States Department of Commerce
  • How to Patent an idea in India: From idea to granted Patent in quickest time, saving costs and making money with your patented invention; a Step by st - Paperback
    How to Patent an idea in India: From idea to granted Patent in quickest time, saving costs and making money with your patented invention; a Step by st - Paperback
    Prasad Karhad

This overview is general legal information, not legal advice, and does not create an attorney–client relationship. Laws vary by state and change over time — consult a licensed attorney about your situation.