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US2624237A
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US
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Lens testing instrument
Assignee: American Optical Corp
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Filing: 1949-11-04
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Granted: 1953-01-06
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Expires: 1969-11-04
Abstract
No abstract record available.
Inventors
- 👤 John K Davis
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-02 19:20
CPC Classifications
G; G01; G01M; G01M11/00; G01M11/02; G01M11/0228; G01M11/0207
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
DE350651C
Cited
GB190327572A
Cited
US1164795A
Cited
US1170579A
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US1383678A
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US1542112A
Cited
US2114282A
Cited
US2504383A
Cited
US2498273A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1956-01-06 | 1956-07-07 | 1957-01-06 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1960-01-06 | 1960-07-07 | 1961-01-06 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1964-01-06 | 1964-07-07 | 1965-01-06 | $7700.00 | Window Closed / Lapsed |