Hydrostatic coupling comprising a planetary gear pump
CA 2250476 A1 · Owner: Baldwin, Fred L. · Inventors: Baldwin, Fred L.
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
A hydrostatic coupling comprises a housing (10) adapted for rotation about a central axis (14). The interior of the housing (10) includes a reservoir (22) for retaining hydraulic fluid, an enclosure (32) retaining a planetary gear pump (26, 36) and ports (38, 40) connecting the reservoir (22) to the pump enclosure (32). A valve assembly (42) is adapted to restrict the flow through output port (40). Torque transmission between sun gear (36) and housing (10) is a function of the flow restriction generated by valve assembly (42).
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 April 4, 1997. No grant is recorded for it in Canada; had it been granted, its 20-year term would have ended April 4, 2017.
- A certificate of supplementary protection adds at most two years for a drug, so even that would have ended by April 4, 2019.
- 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.