Aids for the disabled
CA 1237972 A · Owner: Carters (J & A) Limited · Inventors: Collins, Donald E.
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
A folding backrest of a wheelchair has two attendant handles fixed to upper tubes hinged to vertical lower tubes so as to be turntable into lowered positions. Supported on the upper tubes are respective cams turntable rearwardly by an attendant about a horizontal axis and in opposition to springs, from positions in which they bear against horizontal pins fixed at the rears of the lower tubes and maintain the upper tubes in their raised positions, into positions which allow them to be lowered past the pins to permit the backrest to be lowered.
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 June 14, 1988. A Canadian patent filed before October 1, 1989 lasted 17 years from grant, so its term ended June 14, 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.