US2365285A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Method of making evacuated valves
Assignee: Northrop Grumman Space and Mission Systems Corp
•
Filing: 1943-04-19
•
Granted: 1944-12-19
•
Expires: 1963-04-19
Abstract
No abstract record available.
Inventors
- 👤 Mcdill Rex De Ore
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-02 12:13
CPC Classifications
F; F01; F01L; F01L3/00; F01L3/02; Y; Y10; Y10T; Y10T29/00; Y10T29/49; Y10T29/49229; Y10T29/49298; Y10T29/49307
Claims Analysis
Total Claims: 0
No claims parsed yet. Click Sync Now above to re-index claims from Google Patents.
References Cited (Backward Citations)
No citation records indexed.
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1947-12-19 | 1948-06-19 | 1948-12-19 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1951-12-19 | 1952-06-19 | 1952-12-19 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1955-12-19 | 1956-06-19 | 1956-12-19 | $7700.00 | Window Closed / Lapsed |