US1984751A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Method of making hollow valves
Assignee: Northrop Grumman Space and Mission Systems Corp
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Filing: 1932-11-28
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Granted: 1934-12-18
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Expires: 1952-11-28
Abstract
No abstract record available.
Inventors
- 👤 Eugene A Mcbride
- 👤 Peter B Lerch
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 18:18
CPC Classifications
B; B21; B21K; B21K1/00; B21K1/20; B21K1/22; F; F01; F01L; F01L3/00; F01L3/12; F01L3/14; Y; Y10; Y10T; Y10T29/00; Y10T29/49; Y10T29/49229; Y10T29/49298; Y10T29/49307; Y10T29/49311
Claims Analysis
Total Claims: 0
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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) | 1937-12-17 | 1938-06-18 | 1938-12-18 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1941-12-17 | 1942-06-18 | 1942-12-18 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1945-12-17 | 1946-06-18 | 1946-12-18 | $7700.00 | Window Closed / Lapsed |