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US2665658A
Expired / Lapsed
US
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Surface test indicator
Assignee: Individual
•
Filing: 1949-10-05
•
Granted: 1954-01-12
•
Expires: 1969-10-05
Abstract
No abstract record available.
Inventors
- 👤 Gerald C Welch
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-04 17:37
CPC Classifications
G; G01; G01B; G01B5/00; G01B5/28
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US1021888A
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US1235551A
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US1348210A
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US1445584A
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US1436111A
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US1485247A
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US1645473A
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US1994833A
Cited
US2341809A
Cited
US2316677A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1957-01-11 | 1957-07-13 | 1958-01-12 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1961-01-11 | 1961-07-13 | 1962-01-12 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1965-01-11 | 1965-07-13 | 1966-01-12 | $7700.00 | Window Closed / Lapsed |