Patent US2885637A successfully refreshed from Google Patents.
US2885637A
Expired / Lapsed
US
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Continuous electronic etch depth indicator
Assignee: North American Aviation Corp
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Filing: 1955-10-18
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Granted: 1959-05-05
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Expires: 1975-10-18
Abstract
No abstract record available.
Inventors
- 👤 Eugene L Triman
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-27 07:07
CPC Classifications
G; G01; G01B; G01B7/00; G01B7/26; C; C23; C23F; C23F1/00; C23F1/02; G01N; G01N1/00; G01N1/28; G01N1/32
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1962-05-04 | 1962-11-03 | 1963-05-05 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1966-05-04 | 1966-11-03 | 1967-05-05 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1970-05-04 | 1970-11-03 | 1971-05-05 | $7700.00 | Window Closed / Lapsed |