Door operating mechanism
CA 1108198 A · Owner: Mitro, Tebor · Inventors: Mitro, Tebor
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
Tebor MITRO, ABSTRACT, A novel door mechanism for use with vertically movable doors, in one aspect;, (a) eliminates the need for torsion springs drums, and, cables in the operator. This eliminates bird nesting and other ailments associated with that species of doors; and (b) in vertical lift doors eliminates one of the many counter weights. This is achieved by use of a door moving control line which has flex in only one plane in eg. that the plane is orthogonal to the linear extent of the control line.
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 September 1, 1981. A Canadian patent filed before October 1, 1989 lasted 17 years from grant, so its term ended September 1, 1998.
- 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.