US2436928A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Method of and apparatus for making poppet valves
Assignee: Northrop Grumman Space and Mission Systems Corp
•
Filing: 1944-09-02
•
Granted: 1948-03-02
•
Expires: 1964-09-02
Abstract
No abstract record available.
Inventors
- 👤 Robert A Kempe
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-28 20:46
CPC Classifications
B; B24; B24C; B24C1/00; B24C1/10; F; F01; F01L; F01L3/00; F01L3/02; F16; F16C; F16C33/00; F16C33/02; F16C33/04; F16C33/06; F16C33/12; F16C2223/00; F16C2223/02; F16C2223/08; Y; Y10; Y10T; Y10T29/00; Y10T29/47
Claims Analysis
Total Claims: 0
No claims parsed yet. Click Sync Now above to re-index claims from Google Patents.
References Cited (Backward Citations)
US977268A
Cited
US1351581A
Cited
US1441450A
Cited
US1476854A
Cited
US1784866A
Cited
US1949592A
Cited
US1987234A
Cited
US2077639A
Cited
GB489394A
Cited
US2272686A
Cited
US2248530A
Cited
US2351272A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1951-03-02 | 1951-09-01 | 1952-03-02 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1955-03-02 | 1955-09-01 | 1956-03-02 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1959-03-02 | 1959-09-01 | 1960-03-02 | $7700.00 | Window Closed / Lapsed |