US2479177A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Duplex valve
Assignee: American Machine and Metals Inc
•
Filing: 1944-02-14
•
Granted: 1949-08-16
•
Expires: 1964-02-14
Abstract
No abstract record available.
Inventors
- 👤 Edward L Miller
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-01 11:10
CPC Classifications
G; G05; G05D; G05D23/00; G05D23/01; G05D23/13; G05D23/1393; Y; Y10; Y10T; Y10T137/00; Y10T137/8593; Y10T137/87571; Y10T137/87676; Y10T137/87684
Claims Analysis
Total Claims: 0
No claims parsed yet. Click Sync Now above to re-index claims from Google Patents.
References Cited (Backward Citations)
DE11362C
Cited
US237854A
Cited
US1605765A
Cited
US775021A
Cited
GB190312336A
Cited
US971934A
Cited
GB191011463A
Cited
US1103756A
Cited
US1501331A
Cited
GB177188A
Cited
US1747640A
Cited
US1819045A
Cited
US1885367A
Cited
US1869663A
Cited
US1990653A
Cited
US2039358A
Cited
US2146930A
Cited
US2262290A
Cited
US2376918A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1952-08-15 | 1953-02-14 | 1953-08-16 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1956-08-15 | 1957-02-14 | 1957-08-16 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1960-08-15 | 1961-02-14 | 1961-08-16 | $7700.00 | Window Closed / Lapsed |