Load equalizing power tong gear train
CA 2397595 A1 · Owner: Buck, David A. · Inventors: Buck, David A.
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
An improved power tong gear train which includes a ring gear (6) having an open or closed throat. At least three idler gears (25) are positioned such that at least two of the idler gears (25) engage the ring gear (6) through the ring gear's entire range of rotation. The gear train (20) further has at least one stage of reduction gears engaging the idler gears (25) and has a power gear (29) transferring torque to a stage of the reduction gears. Also disclosed is a power tong gear train (20) having a load equalizing gear (35). The gear train (20) includes a ring gear (6) which has at least one idler gear (25) engaging the ring gear (6). At least one stage of reduction gears engages …
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 January 17, 2001. No grant is recorded for it in Canada; had it been granted, its 20-year term would have ended January 17, 2021.
- A certificate of supplementary protection adds at most two years for a drug, so even that would have ended by January 17, 2023.
- 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.