US2881795A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Diaphragm check-valves
Assignee: Johannes Erhard H Waldenmaier Erben Suddeutsche Armaturenfabrik
•
Filing: 1956-12-19
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Granted: 1959-04-14
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Expires: 1976-12-19
Abstract
No abstract record available.
Inventors
- 👤 Waldenmaier Heinz Werner
- 👤 Krause Walter
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 02:29
CPC Classifications
F; F16; F16K; F16K15/00; F16K15/14; F16K15/144; F16K15/16; Y; Y10; Y10T; Y10T137/00; Y10T137/7722; Y10T137/7837; Y10T137/7879; Y10T137/7888; Y10T137/7891
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US314107A
Cited
US2191458A
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US1800157A
Cited
US1855991A
Cited
US2381287A
Cited
US2302930A
Cited
US2394911A
Cited
US2772829A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1962-04-13 | 1962-10-13 | 1963-04-14 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1966-04-13 | 1966-10-13 | 1967-04-14 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1970-04-13 | 1970-10-13 | 1971-04-14 | $7700.00 | Window Closed / Lapsed |