Trap seal
CA 1319083 C · Owner: Nunweiler, M. W. Kenneth · Inventors: Nunweiler, M. W. Kenneth
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
A tree-felling saw head that is slidably displaceable out of an enclosure by a pair of hydraulic rams and into cutting relationship with a tree includes a pair of, stationary top and bottom plates between which is rotatably mounted a saw disk with replaceable teeth. The disk is driven by a pinion gear of a hydraulic motor engaging a ring gear mounted within a recess of the disk into which the top, plate fits as a protective cover. Intrusion of foreign matter into the saw head through a clearance space between the disk and top plate is inhibited by a trap seal that comprises, in one embodiment, a pair of coplanar annular grooves in the facing circumferential edges of the top plate and 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
- Granted June 15, 1993. A Canadian patent filed before October 1, 1989 lasted 17 years from grant, so its term ended June 15, 2010.
- 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.