US3532446A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Sliding seal and valve for reciprocating pump
Assignee: MARGRETE L STINNES
•
Filing: 1967-04-04
•
Granted: 1970-10-06
•
Expires: 1987-04-04
Abstract
No abstract record available.
Inventors
- 👤 L Francis Herreshoff
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-05 20:55
CPC Classifications
F; F04; F04B; F04B53/00; F04B53/10; F04B53/12; F04B53/121; F04B9/00; F04B9/14
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US2360085A
Cited
US2444119A
Cited
US2783068A
Cited
DE1147898B
Cited
GB928876A
Cited
FR1354369A
Cited
CH417250A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1973-10-05 | 1974-04-06 | 1974-10-06 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1977-10-05 | 1978-04-06 | 1978-10-06 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1981-10-05 | 1982-04-06 | 1982-10-06 | $7700.00 | Window Closed / Lapsed |