Patent US3413897A successfully refreshed from Google Patents.
US3413897A
Expired / Lapsed
US
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Oil gallery equipped pistons and methods of making same
Assignee: Northrop Grumman Space and Mission Systems Corp
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Filing: 1965-06-17
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Granted: 1968-12-03
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Expires: 1985-06-17
Abstract
No abstract record available.
Inventors
- 👤 Rupert L Atkin
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-28 17:35
CPC Classifications
F; F02; F02F; F02F3/00; F02F3/16; F02F3/20; F02F3/22; F02F2200/00; F02F2200/04; F05; F05C; F05C2201/00; F05C2201/02; F05C2201/021; Y; Y10; Y10T; Y10T29/00; Y10T29/49; Y10T29/49229; Y10T29/49249; Y10T29/49265
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US3075817A
Cited
US3181514A
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US3189010A
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US3341924A
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US3204617A
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US3190273A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1971-12-03 | 1972-06-03 | 1972-12-03 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1975-12-03 | 1976-06-03 | 1976-12-03 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1979-12-03 | 1980-06-03 | 1980-12-03 | $7700.00 | Window Closed / Lapsed |