Patent US2073635A successfully refreshed from Google Patents.
US1985805A
Expired / Lapsed
US
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Valve tip hardening machine
Assignee: Northrop Grumman Space and Mission Systems Corp
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Filing: 1933-05-09
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Granted: 1934-12-25
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Expires: 1953-05-09
Abstract
No abstract record available.
Inventors
- 👤 William H Spire
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 00:25
CPC Classifications
C; C21; C21D; C21D1/00; C21D1/34; C21D1/40
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) | 1937-12-24 | 1938-06-25 | 1938-12-25 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1941-12-24 | 1942-06-25 | 1942-12-25 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1945-12-24 | 1946-06-25 | 1946-12-25 | $7700.00 | Window Closed / Lapsed |