US2965373A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Leveling valve
Assignee: Northrop Grumman Space and Mission Systems Corp
•
Filing: 1958-04-28
•
Granted: 1960-12-20
•
Expires: 1978-04-28
Abstract
No abstract record available.
Inventors
- 👤 John P Heiss
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-09 00:54
CPC Classifications
B; B60; B60G; B60G17/00; B60G17/02; B60G17/04; B60G17/048; Y; Y10; Y10S; Y10S267/00; Y10S267/01; Y10S280/00; Y10S280/01
Claims Analysis
Total Claims: 0
No claims parsed yet. Click Sync Now above to re-index claims from Google Patents.
References Cited (Backward Citations)
US483529A
Cited
US483829A
Cited
US1595330A
Cited
US1819414A
Cited
US1956668A
Cited
US1961747A
Cited
US2313242A
Cited
US2616687A
Cited
US2802664A
Cited
US2856180A
Cited
US2883181A
Cited
FR1100585A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1963-12-20 | 1964-06-20 | 1964-12-20 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1967-12-20 | 1968-06-20 | 1968-12-20 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1971-12-20 | 1972-06-20 | 1972-12-20 | $7700.00 | Window Closed / Lapsed |