Bailer having leak-inhibiting cushioned seal
CA 2356448 A1 · Owner: Pratt, David W. · Inventors: Pratt, David W.
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
A bailer that is substantially leak-free includes an improved valve assembly at its lowermost, end. In a first embodiment a valve body in the form of a hemispherical ball is mounted at the, lowermost end of a straight valve stem. The hemispherical ball seats in a valve seat that matches the, contour of the hemispherical exterior surface of the ball. In a second embodiment, the valve body and, the matching valve seat are both frusto-conical in configuration. In a third embodiment, the valve, body and matching valve seat are tapered downwardly to form an elongate narrow slot. A fourth, embodiment adds a guide member to the third embodiment structure to ensure seating of the, downwardly …
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 August 31, 2001. No grant is recorded for it in Canada; had it been granted, its 20-year term would have ended August 31, 2021.
- A certificate of supplementary protection adds at most two years for a drug, so even that would have ended by August 31, 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.