US2931376A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Hygroscopic valve construction
Assignee: Individual
•
Filing: 1956-01-03
•
Granted: 1960-04-05
•
Expires: 1976-01-03
Abstract
No abstract record available.
Inventors
- 👤 Joseph A Hendel
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-26 10:28
CPC Classifications
F; F16; F16K; F16K31/00; F16K31/001; F24; F24D; F24D19/00; F24D19/08; F24D19/082; F24D19/083; F24D19/085; F24D19/087; Y; Y10; Y10T; Y10T137/00; Y10T137/2931; Y10T137/3003; Y10T137/3084; Y10T137/8593; Y10T137/86493; Y10T137/86879; Y10T137/86895; Y10T137/877; Y10T137/87877; Y10T137/87917
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US1242864A
Cited
US2076805A
Cited
US2314963A
Cited
US2467217A
Cited
US2655170A
Cited
US2845080A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1963-04-05 | 1963-10-05 | 1964-04-05 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1967-04-05 | 1967-10-05 | 1968-04-05 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1971-04-05 | 1971-10-05 | 1972-04-05 | $7700.00 | Window Closed / Lapsed |