US2081431A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Valve seat
Assignee: Individual
•
Filing: 1934-03-10
•
Granted: 1937-05-25
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Expires: 1954-03-10
Abstract
No abstract record available.
Inventors
- 👤 Leland S Hamer
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 15:55
CPC Classifications
F; F16; F16K; F16K1/00; F16K1/32; F16K1/34; F16K1/42; F16B; F16B2200/00; F16B2200/67; Y; Y10; Y10T; Y10T137/00; Y10T137/598; Y10T137/6154; Y10T29/00; Y10T29/49; Y10T29/49229; Y10T29/49298; Y10T29/49306; Y10T29/49815; Y10T29/49822; Y10T29/49826; Y10T29/49863; Y10T29/53; Y10T29/53796; Y10T29/5383
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) | 1940-05-24 | 1940-11-23 | 1941-05-25 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1944-05-24 | 1944-11-23 | 1945-05-25 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1948-05-24 | 1948-11-23 | 1949-05-25 | $7700.00 | Window Closed / Lapsed |