Trawling apparatus
CA 1233641 A · Owner: Collins, Clifford W. · Inventors: Collins, Clifford W.
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
10-, Title: "TRAWLING APPARATUS", ABSTRACT Trawling apparatus, including otterboards sleds and mid-water boards (47) have transverse slats (50,54) fixed to a frame has uprights (48) and a shoe. The apparatus is towed via a towing yoke (49) attached to a towing cable. The slats (50,54) have upright front portions (51) which define flow passages (53) therebetween. The trailing portions (52) are upwardly inclined to generate a down force to urge the apparatus to the ocean floor. On the mid-water boards (47), the lower slats (54) have hinged trailing portions (55) which are adjustable to enable the mid-water boards (47) to be towed down to, and maintained at, a desired depth.
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 March 8, 1988. A Canadian patent filed before October 1, 1989 lasted 17 years from grant, so its term ended March 8, 2005.
- 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.