Pump
Patent 3940028 Issued on February 24, 1976. Estimated Expiration Date: 
February 24, 1993. 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.
February 24, 1993. 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 3187960 3211346 3228570 3257961 3282472 3463093 3531224 3669316 3669321 InventorApplicationNo. 505963 filed on 09/16/1974US Classes:222/321.3, With antileak or antisiphon means222/321.9Pump casing within supply containerExaminersPrimary: Hoffman, Drayton E.Assistant: Lane, Hadd Attorney, Agent or FirmAbstractA pump for dispensing small metered quantities of a liquid from a container such as a jar or can, the pump including a housing and a plunger, in combination with a valve comprising an annular washer having a rectangular cross-section, assembled between the pump housing and the plunger to provide tight seals throughout a plurality of annular surfaces, in order to prevent leakage in the closed position, and to tilt axially on the pumping stroke to permit escape of the liquid being pumped. Automatically opening container venting means is also provided. | |
