Patent US2518240A successfully refreshed from Google Patents.
US2518240A
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US
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Projection microscope
Assignee: American Optical Corp
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Filing: 1947-07-25
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Granted: 1950-08-08
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Expires: 1967-07-25
Abstract
No abstract record available.
Inventors
- 👤 David D Lowber
- 👤 Joseph D Reardon
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-02 17:44
CPC Classifications
G; G03; G03B; G03B21/00; G03B21/10
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
GB368038A
Cited
US2211218A
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US2209532A
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US2313639A
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US2373929A
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US2378870A
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US2414977A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1953-08-07 | 1954-02-06 | 1954-08-08 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1957-08-07 | 1958-02-06 | 1958-08-08 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1961-08-07 | 1962-02-06 | 1962-08-08 | $7700.00 | Window Closed / Lapsed |