Safety device with retractable lifeline
CA 2000516 C · Owner: Db Industries, Inc. · Inventors: Wolner, J. Thomas
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
J. Thomas Wolner, SAFETY DEVICE WITH RETRACTABLE LIFELINE ABSTRACT OF THE DISCLOSURE, A safety device for restraining a person who works at great heights. The device comprises a housing a, drum rotatably mounted and contained within the housing, and a lifeline having a first end attached to the drum, and a second end extending outside the housing and adapted to be connected to a restraint. The lifeline is wound around the drum in response to the drum being rotated in a retracting direction and, the lifeline is unwound from around the drum in response to the drum being rotated in an opposite extending direction. The device also includes a spring for biasing the drum to rotate in the …
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 October 12, 1989 and granted June 21, 1994. A Canadian patent filed from October 1, 1989 lasts 20 years from filing, so its term ended October 12, 2009.
- A certificate of supplementary protection adds at most two years for a drug, so even that would have ended by October 12, 2011.
- 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.