Patent US2415606A successfully refreshed from Google Patents.
US2415606A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Method of making shrouded poppet valves
Assignee: Northrop Grumman Space and Mission Systems Corp
•
Filing: 1943-12-31
•
Granted: 1947-02-11
•
Expires: 1963-12-31
Abstract
No abstract record available.
Inventors
- 👤 Novak Louis Philip
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-04 08:11
CPC Classifications
B; B23; B23P; B23P13/00; Y; Y10; Y10T; Y10T29/00; Y10T29/49; Y10T29/49229; Y10T29/49298; Y10T29/49307; Y10T29/49311
Claims Analysis
Total Claims: 0
No claims parsed yet. Click Sync Now above to re-index claims from Google Patents.
References Cited (Backward Citations)
US933698A
Cited
US1106064A
Cited
US1136408A
Cited
US1106054A
Cited
US1235344A
Cited
US1583432A
Cited
US1789374A
Cited
US1727621A
Cited
US2057858A
Cited
US1984751A
Cited
US2032162A
Cited
US2127929A
Cited
GB470934A
Cited
US2135966A
Cited
US2165871A
Cited
US2277356A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1950-02-10 | 1950-08-12 | 1951-02-11 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1954-02-10 | 1954-08-12 | 1955-02-11 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1958-02-10 | 1958-08-12 | 1959-02-11 | $7700.00 | Window Closed / Lapsed |