Patent Cease & Desist Letter — Washington
Protect your invention. Demand another party stop making, using, or selling a product that infringes your patent. Answer a few questions and download a firm, professional letter. Tailored for Washington.
June 22, 2026
C&DSeal
Re: Cease & Desist — Patent Infringement
To Whom It May Concern,
This letter serves as formal notice that you must immediately cease and desist all conduct described below directed toward the undersigned.
You are hereby demanded to stop this conduct entirely. You have 14 days from the date of this letter to comply…
Sending your letter in Washington
This page tailors the letter for Washington. A cease and desist letter is not filed with a court — it is sent directly to the other party — but keeping a dated copy and proof of delivery is especially useful if you later pursue a matter in Washington's courts, small claims court, or through a protective order. Deadlines and available remedies vary by state, so treat the timeframe in your letter as a reasonable demand rather than a statutory rule.
In Washington, sending the letter by certified mail with return receipt (in addition to email or hand delivery) gives you documented proof that the recipient received your demand — valuable evidence if the conduct continues.
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When to send a cease & desist for patent in Washington
A patent gives you the right to stop others from making, using, or selling your invention. A cease and desist letter is a standard first step to enforce it. Send one when another party is:
- Selling a product that copies your patented invention
- Manufacturing or importing an infringing product
- Using your patented process or method without a license
- Refusing to stop after being made aware of your patent
Every letter includes
- Your details and the recipient's
- A clear demand to cease the conduct
- A firm compliance deadline
- A warning of legal consequences
- Space for your dated signature
Frequently asked questions
Patentcease & desist letters by state
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- Alabama
- Alaska
- Arizona
- Arkansas
- California
- Colorado
- Connecticut
- Delaware
- District of Columbia
- Florida
- Georgia
- Hawaii
- Idaho
- Illinois
- Indiana
- Iowa
- Kansas
- Kentucky
- Louisiana
- Maine
- Maryland
- Massachusetts
- Michigan
- Minnesota
- Mississippi
- Missouri
- Montana
- Nebraska
- Nevada
- New Hampshire
- New Jersey
- New Mexico
- New York
- North Carolina
- North Dakota
- Ohio
- Oklahoma
- Oregon
- Pennsylvania
- Rhode Island
- South Carolina
- South Dakota
- Tennessee
- Texas
- Utah
- Vermont
- Virginia
- West Virginia
- Wisconsin
- Wyoming
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