Patent US2211353A successfully refreshed from Google Patents.
Patent US2544820A successfully refreshed from Google Patents.
US2544820A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Fuel tank vent valve
Assignee: Northrop Grumman Corp
•
Filing: 1949-05-19
•
Granted: 1951-03-13
•
Expires: 1969-05-19
Abstract
No abstract record available.
Inventors
- 👤 Bill P Baker
- 👤 Leonard J Lyons
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-09 01:05
CPC Classifications
B; B64; B64D; B64D37/00; B64D37/005; Y; Y10; Y10T; Y10T137/00; Y10T137/8593; Y10T137/86292; Y10T137/86324
Claims Analysis
Total Claims: 0
No claims parsed yet. Click Sync Now above to re-index claims from Google Patents.
References Cited (Backward Citations)
US888739A
Cited
US906381A
Cited
US1107084A
Cited
US1258915A
Cited
US1923384A
Cited
US2234393A
Cited
US2340936A
Cited
US2383369A
Cited
GB572839A
Cited
US2404765A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1954-03-12 | 1954-09-11 | 1955-03-13 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1958-03-12 | 1958-09-11 | 1959-03-13 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1962-03-12 | 1962-09-11 | 1963-03-13 | $7700.00 | Window Closed / Lapsed |