Patent US2450803A successfully refreshed from Google Patents.
US2450803A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Method of making sheathed valves
Assignee: Northrop Grumman Space and Mission Systems Corp
•
Filing: 1944-02-14
•
Granted: 1948-10-05
•
Expires: 1964-02-14
Abstract
No abstract record available.
Inventors
- 👤 Paul P Johnson
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-07 19:58
CPC Classifications
B; B23; B23P; B23P15/00; B23P15/001; B23P15/002; Y; Y10; Y10S; Y10S428/00; Y10S428/922; Y10S428/9335; Y10S428/934; Y10S428/935; Y10S428/939; Y10T; Y10T29/00; Y10T29/49; Y10T29/49229; Y10T29/49298; Y10T29/49307; Y10T29/49309
Claims Analysis
Total Claims: 0
No claims parsed yet. Click Sync Now above to re-index claims from Google Patents.
References Cited (Backward Citations)
US1218317A
Cited
US1826542A
Cited
US1826549A
Cited
US1848083A
Cited
US2002641A
Cited
US1889916A
Cited
US1959068A
Cited
US1984751A
Cited
US2089749A
Cited
US2052862A
Cited
FR803927A
Cited
US2218983A
Cited
US2300850A
Cited
US2354947A
Cited
US2403926A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1951-10-05 | 1952-04-05 | 1952-10-05 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1955-10-05 | 1956-04-05 | 1956-10-05 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1959-10-05 | 1960-04-05 | 1960-10-05 | $7700.00 | Window Closed / Lapsed |