Pump dispenser with sealing plunger
Patent 4355962 Issued on October 26, 1982. Estimated Expiration Date: 
December 26, 1999. 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.
December 26, 1999. 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 ReferencesLiquid dispenser locking means Manually operated sprayer Atomizing pump Patent #: 4262823 InventorAssigneeApplicationNo. 06/106924 filed on 12/26/1979US Classes:417/552, Reciprocating222/321.3With antileak or antisiphon meansExaminersPrimary: Freeh, William L.Attorney, Agent or FirmInternational ClassB05B 11/00 (20060101)AbstractThe hand-operated pump has a piston which is reciprocated within the hollow pump body by a plunger which itself is reciprocated through an opening in a collar at one end of the pump body. When the plunger is in a fully extended condition at one end of a stroke, a direct seal is obtained between an annular projection on the plunger and an annular groove on the collar which receives said projection. Thus, leakage is prevented along the interface between the plunger and the collar through the opening during shipment or accidental inversion of the pump at other times.Field of SearchFlexible | |
