Patent US2853097A successfully refreshed from Google Patents.
Patent US2280937A successfully refreshed from Google Patents.
US2280937A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Pressure regulating device for fluid supply systems
Assignee: Whitnash PLC
•
Filing: 1941-04-25
•
Granted: 1942-04-28
•
Expires: 1961-04-25
Abstract
No abstract record available.
Inventors
- 👤 Thornhill Peter Warborn
- 👤 Simpson John Keith
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-27 19:05
CPC Classifications
G; G05; G05D; G05D16/00; G05D16/04; G05D16/10; G05D16/107; F; F16; F16K; F16K15/00; F16K15/02; F16K15/06; F16K15/063; G05D16/101; Y; Y10; Y10T; Y10T137/00; Y10T137/7722; Y10T137/7738; Y10T137/7837; Y10T137/7904; Y10T137/7907; Y10T137/7922; Y10T137/7929
Claims Analysis
Total Claims: 0
No claims parsed yet. Click Sync Now above to re-index claims from Google Patents.
References Cited (Backward Citations)
No citation records indexed.
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1945-04-27 | 1945-10-27 | 1946-04-28 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1949-04-27 | 1949-10-27 | 1950-04-28 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1953-04-27 | 1953-10-27 | 1954-04-28 | $7700.00 | Window Closed / Lapsed |