Videocassette wear button
CA 1236214 A · Owner: Minnesota Mining And Manufacturing Company · Inventors: Cybulski, Claude E.
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
Videocassette tape spool (10) including a wear button piece (24) which is formed as a separate small, piece and which projects beyond one of the flanges (14 22), of the tape spool (10). The wear button piece (24) is molded of a highly abrasion-resistant polymer and is mounted to the hub (16) of the spool (10) by means of a cylindrical stud (40) projecting from the hub (16) and a hexagonal blind bore (33) formed within the wear button piece (24) which accepts the stud (40) in an interference fit.
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 May 3, 1988. A Canadian patent filed before October 1, 1989 lasted 17 years from grant, so its term ended May 3, 2005.
- 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.