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How to read a patent claim without a law degree

Invenit ·

When you search for earlier patents, the title and the abstract can mislead you. The part that matters most is the claims. This is general guidance, not legal advice.

What the claims are

A patent document describes an invention at length, then ends with numbered claims. The claims set out what the patent actually protects. The rest of the document explains and illustrates them.

Independent and dependent claims

  • An independent claim stands on its own. It is usually the broadest statement of the invention.
  • A dependent claim refers back to another claim, for example "the device of claim 1, wherein...". It adds a detail to that claim.

Start with the independent claims. They show the widest reach of the patent.

Reading one claim

A claim is one long sentence, built from a list of features. Break it into parts:

  1. The opening names the kind of thing claimed, such as "A kitchen device comprising".
  2. Each item after that is a feature that has to be present.
  3. Words like "wherein" add detail about how a feature works or connects.

Write each feature on its own line. You now have a checklist.

Comparing it with your invention

For each feature on the checklist, ask whether your invention has it. Then note, for the closest documents you have found:

  • which features your invention shares with the claim;
  • which features it does not have;
  • which features you cannot judge from the text alone.

This feature-by-feature view is more useful than a general feeling that two things are "similar".

Things to keep in mind

  • Words in claims can have specific meanings. A registered patent attorney can tell you how a claim would be read.
  • A patent's description can matter as well as its claims.
  • Not finding a matching claim does not prove nothing exists.

Where Invenit fits

Invenit is being built to compare what it finds with your invention, and to present that comparison so you can see where earlier documents match, partly match, or do not. It will not write or file patents. Join the waitlist to hear when it opens.