Patent US2640190A successfully refreshed from Google Patents.
US2640190A
Expired / Lapsed
US
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System for measuring the thickness of opaque objects
Assignee: Individual
•
Filing: 1945-09-04
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Granted: 1953-05-26
•
Expires: 1965-09-04
Abstract
No abstract record available.
Inventors
- 👤 Rines Robert Harvey
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 17:34
CPC Classifications
G; G01; G01B; G01B11/00; G01B11/02; G01B11/06; G01B15/00; G01B15/02; G01B17/00; G01B17/02; G01B2210/00; G01B2210/40; G01B2210/44
Claims Analysis
Total Claims: 0
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USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1956-05-25 | 1956-11-24 | 1957-05-26 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1960-05-25 | 1960-11-24 | 1961-05-26 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1964-05-25 | 1964-11-24 | 1965-05-26 | $7700.00 | Window Closed / Lapsed |