Patent US2500726A successfully refreshed from Google Patents.
US2500726A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Light-weight optical lever micrometer
Assignee: Individual
•
Filing: 1945-05-23
•
Granted: 1950-03-14
•
Expires: 1965-05-23
Abstract
No abstract record available.
Inventors
- 👤 John L Westhaver
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-07 13:07
CPC Classifications
G; G01; G01B; G01B9/00; G01B11/00; G01B11/02; G01B11/06
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US438300A
Cited
US1184399A
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US1337018A
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GB165935A
Cited
GB238600A
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US1889719A
Cited
US1863673A
Cited
FR684213A
Cited
GB389541A
Cited
US2224281A
Cited
US2366645A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1953-03-13 | 1953-09-12 | 1954-03-14 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1957-03-13 | 1957-09-12 | 1958-03-14 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1961-03-13 | 1961-09-12 | 1962-03-14 | $7700.00 | Window Closed / Lapsed |