Tape cassette structure
CA 2085196 A1 · Owner: Nishiyama, Tousaku · Inventors: Watanabe, Masaru; Nishiyama, Tousaku; Watanabe, Masaru
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
Abstract, A cassette for accommodating a magnetic recording tape comprises a generally rectangular casing. An erasure preventing member is accommodated within a detection hole in the casing for selective movement between retracted and projected positions. This member has an outer surface that in the projected position closes the detection hole and lies flush with an outer surface of the rear wall of the casing indicating that the tape is available for recording or erasure. When the erasure preventing member is moved to its retracted position with its outer surface located inwardly from the rear wall, the cassette is in the condition in which neither recording nor erasure can be accomplished.
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
- Filed December 11, 1992. No grant is recorded for it in Canada; had it been granted, its 20-year term would have ended December 11, 2012.
- A certificate of supplementary protection adds at most two years for a drug, so even that would have ended by December 11, 2014.
- 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.