Laterally stabilized inflatable bead turn-up bladder for tire building drum
CA 2058357 A1 · Owner: Bridgestone/Firestone, Inc. · Inventors: Vanbuskirk, William J.; Vanbuskirk, William J.
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
An improved inflatable bead turn-up bladder for a tire building drum which reduces or eliminates cord length variation in a reinforced tire carcass by stabilizing the bladder in the area utilized for lifting the reinforced cord fabric into contact with the tire bead on the tire building drum. The elastomeric inflatable bladder is formed with an integral annular rib which is seated in complementary shaped grooves or slots formed in the radially movable segments of the tire drum bead locks. When the bead lock segments are actuated the adjacent, portion of the bladder and overlying tire carcass is prevented from axial movement by the engagement of the bladder rib in the bead lock segment …
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 December 23, 1991. No grant is recorded for it in Canada; had it been granted, its 20-year term would have ended December 23, 2011.
- A certificate of supplementary protection adds at most two years for a drug, so even that would have ended by December 23, 2013.
- 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.