US2521820A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Optical comparator for testing cams
Assignee: Jones and Lamson Machine Co
•
Filing: 1946-11-14
•
Granted: 1950-09-12
•
Expires: 1966-11-14
Abstract
No abstract record available.
Inventors
- 👤 Robert O Beardsley
- 👤 Leon B Fuller
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-30 13:46
CPC Classifications
G; G02; G02B; G02B21/00; G02B21/0004; G02B21/0016
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US1157796A
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US1589349A
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US1732730A
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US1703933A
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US1789009A
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US2035780A
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US2222165A
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US2422611A
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US2414867A
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US2372470A
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US2401382A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1953-09-11 | 1954-03-13 | 1954-09-12 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1957-09-11 | 1958-03-13 | 1958-09-12 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1961-09-11 | 1962-03-13 | 1962-09-12 | $7700.00 | Window Closed / Lapsed |