Piston for aerosol container
Patent 4234108 Issued on November 18, 1980. Estimated Expiration Date: 
November 25, 1997. Estimated Expiration Date is calculated based on simple USPTO term provisions. It does not account for terminal disclaimers, term adjustments, failure to pay maintenance fees, or other factors which might affect the term of a patent.
November 25, 1997. Estimated Expiration Date is calculated based on simple USPTO term provisions. It does not account for terminal disclaimers, term adjustments, failure to pay maintenance fees, or other factors which might affect the term of a patent.Patent References 2371332 3273762 3275200 3381863 3870200 3901416 Preserving container for liquid food substances Patent #: 3987941 InventorApplicationNo. 05/854487 filed on 11/25/1977US Classes:222/386, Container with follower222/389, Fluid pressure actuated92/240Side wall portion includes peripheral axially extending flexible lipExaminersPrimary: Spar, Robert J.Assistant: Silverberg, Fred A. Attorney, Agent or FirmInternational ClassesF16J 1/00 (20060101)B65D 83/14 (20060101) F16J 15/32 (20060101) AbstractA piston for an aerosol container, particularly adapted for insertion through the top of the container; the piston includes an annular, cylindrical collar near its top end and a conical outwardly flaring flange atop the cylindrical collar, with the flange flaring wider toward the top of the container, whereby the flange scrapes the container interior as it moves up; the cylindrical collar is more flexible than the conical flange to ease insertion of the piston and for more effective piston sealing despite the piston cocking in the container; an anti-cocking ring are provided on the piston. | |
