Sealed letter
CA 1267386 C · Owner: Ikeda, Etsujiro · Inventors: Ikeda, Etsujiro
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
A sealed letter in which a document on which an address and other descriptive matter are printed is covered on its front surface, with a front sheet made of transparent paper laminated, at least on its internal surface with a, transparent and thermally adhesive synthetic resin film said, document being covered on its rear surface with a rear sheet made of a paper material, the front sheet and the rear sheet being adhered together by heat at their peripheral portions to form an enclosed sealed portion.
Read the whole patent
Listed from its CIPO record in Patent Yard's archive of Canadian patents past their term. Its claims, description and drawings are in the CIPO record and on Google Patents, and the Claude kit works from them.
Why it's free to use
- Granted April 3, 1990. A Canadian patent filed before October 1, 1989 lasted 17 years from grant, so its term ended April 3, 2007.
- We check Canadian rights only. A patent in its family in another country could still be in force: check its family on Google Patents.
Timeline
Timeline From CIPO dates
Sources & verification
Official CIPO records
Everything on this page comes from the CIPO record linked above. Contains information licensed under the Open Government Licence – Canada.