Pump for spray dispenser and the like
Patent 3997086 Issued on December 14, 1976. Estimated Expiration Date: 
December 14, 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.
December 14, 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 3640470 3724726 3865313 InventorAssigneeApplicationNo. 607251 filed on 08/25/1975US Classes:222/385, Pump or pulsator casing within supply container222/340, For reciprocating piston on follower-type impeller239/333Separable pump with holder mount or securing meansExaminersPrimary: Knowles, Allen N.Assistant: Stack, N. L. Jr. Attorney, Agent or FirmAbstractPump for spray dispenser has spring-pressed annular piston serving as an accumulator and controlling flow through the pump discharge so that no discharge passes unless and until pressure within the pump housing is sufficiently high. | |
