How to File a Provisional Patent: A Kansas Inventor's Guide

What a provisional does, and does not do

A provisional patent application locks in a filing date and lets you say patent pending. No examiner reviews it, and it never becomes a patent on its own. It holds your place in line for twelve months while you test the idea, then it expires unless you file a full application that claims its date.

Think of it as a deposit on your priority date. Cheap to place, but worthless if you walk away before the year ends.

What to include

The document does not need formal patent claims, but it does need enough detail that someone skilled in the field could build what you describe. A thin filing buys you a date you cannot actually rely on, so write it as if you were teaching a competent stranger to make the thing.

• A full written description of how the invention works and how to make it.
• Drawings or photos of every part that matters, labeled clearly.
• Any variations you can imagine, so the later application can claim them.

How to file

You file with the United States Patent and Trademark Office through its online system. Set up an account, upload your description and drawings, and pay the fee. Small companies and solo inventors qualify for reduced small entity and micro entity fees, which drop the filing cost to a level most inventors can cover.

You can file it yourself, and many inventors do. A patent attorney will still help you write a description broad enough to protect the idea, which is the part that decides whether the filing was worth anything.

The twelve-month clock

The day you file, a clock starts. You have twelve months to file a non-provisional application that references the provisional, or you lose the early date. Miss the deadline and you start over, often after you have already disclosed the invention publicly, which can cost you the right to a patent at all.

What to do during the year

Use the twelve months. Test the market, refine the design, and decide whether the idea earns the cost of a full application. Talk to a patent attorney a few months before the deadline, not the week of, so there is time to write the real thing.

If you might want protection outside the United States, raise that early. Public disclosure rules differ abroad, and a conversation before you show the invention can save an option you did not know you had.