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Patent US3041715A successfully refreshed from Google Patents.
US3041715A
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Method of making valve spring retainer locks
Assignee: Northrop Grumman Space and Mission Systems Corp
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Filing: 1958-04-18
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Granted: 1962-07-03
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Expires: 1978-04-18
Abstract
No abstract record available.
Inventors
- 👤 Samuel H Norton
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-05 16:31
CPC Classifications
B; B21; B21K; B21K1/00; B21K1/20; Y; Y10; Y10T; Y10T29/00; Y10T29/49; Y10T29/49789; Y10T29/49798
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
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US1675299A
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US1676205A
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US1850029A
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US1823009A
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US1973227A
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US2037838A
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US2353925A
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US2505128A
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US2523570A
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US2682387A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1965-07-02 | 1966-01-01 | 1966-07-03 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1969-07-02 | 1970-01-01 | 1970-07-03 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1973-07-02 | 1974-01-01 | 1974-07-03 | $7700.00 | Window Closed / Lapsed |