Magnetic-tape cassette
CA 1208778 A · Owner: N.V.Philips'Gloeilampenfabrieken · Inventors: Sieben, Joannes H.F.C.
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
18, ABSTRACT:, In a tape cassette having two flanged tape spools (14 and 15) arranged for rotation about parallel axes (12 and 13) in the cassette housing (1), a brake device 33 is provided for preventing rotation of the spools in a direction to unwind the tape (16) when the cassette is removed from a recording apparatus, and also for tensioning the tape between the spools. The brake device comprises two pawls (35 and 36) carried on a spring-loaded sliding mount (34) and arranged to cooperate one with ratchet teeth on the upper flange (10) of one spool and the other with ratchet teeth on the lower flange (18) of the other spool the teeth on the two flanges being orientated in opposite …
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 July 29, 1986. A Canadian patent filed before October 1, 1989 lasted 17 years from grant, so its term ended July 29, 2003.
- 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.