US1937038A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Automatic relief valve
Assignee: FRANKLIN W INGRAM
•
Filing: 1929-02-18
•
Granted: 1933-11-28
•
Expires: 1949-02-18
Abstract
No abstract record available.
Inventors
- 👤 Walter L Ingram
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-06 14:07
CPC Classifications
B; B60; B60C; B60C29/00; Y; Y10; Y10T; Y10T137/00; Y10T137/3584; Y10T137/36; Y10T137/7722; Y10T137/7837; Y10T137/7904; Y10T137/7922; Y10T137/7925
Claims Analysis
Total Claims: 0
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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) | 1936-11-27 | 1937-05-29 | 1937-11-28 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1940-11-27 | 1941-05-29 | 1941-11-28 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1944-11-27 | 1945-05-29 | 1945-11-28 | $7700.00 | Window Closed / Lapsed |