This letter is an example of a “cease-and-desist letter.” Note the express accusation of infringement “the enclosed literature we obtained describing your hermetic sealing of semiconductor packages indicates that your company is infringing the above-identified patents.”

March 22, 1982

Mr. W. N. Macartney, President
INDIUM CORPORATION OF AMERICA
Box 269, 1676 Lincoln Avenue
Utica, NY 13503
Dear Mr. Macartney:

On February 22, 1982 I wrote to you and advised of Semi-Alloys, Inc.’s ownership of U.S. Patent Numbers 3,823,468; 3,874,549; and 3,946,190.

In our view the enclosed literature that we obtained describing your hermetic sealing of semiconductor packages indicates that your company is infringing the above-identified patents. Accordingly we demand that you immediately cease and desist from any further unauthorized production and sales of such semiconductor packages that include features covered by our patents.

We expect to enforce our patent rights against your company should the matter remain unresolved.

Yours very truly,
SEMI-ALLOYS, INC.
[signature]
Samuel W. Levine
Vice President

Also note the demand to “immediately cease and desist from any further unauthorized production and sales of such semiconductor packages that include features covered by our patents.”

The accused infringer in this case will be entitled to file a declaratory judgment action. Often, a patentee will follow-up an invitation to take a license with a letter like this one.