US2718233A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Valves
Assignee: Walworth Co
•
Filing: 1953-01-28
•
Granted: 1955-09-20
•
Expires: 1973-01-28
Abstract
No abstract record available.
Inventors
- 👤 Frederick J Krummel
- 👤 Oliver E Duemler
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-27 22:20
CPC Classifications
F; F16; F16K; F16K39/00; F16K39/04; Y; Y10; Y10T; Y10T137/00; Y10T137/2496; Y10T137/2559
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US1640408A
Cited
US1686310A
Cited
US1897432A
Cited
US2626655A
Cited
US2613908A
Cited
US2670752A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1958-09-19 | 1959-03-21 | 1959-09-20 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1962-09-19 | 1963-03-21 | 1963-09-20 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1966-09-19 | 1967-03-21 | 1967-09-20 | $7700.00 | Window Closed / Lapsed |