US2700918A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Microscope with variable means for increasing the visibility of optical images
Assignee: American Optical Corp
•
Filing: 1949-01-19
•
Granted: 1955-02-01
•
Expires: 1969-01-19
Abstract
No abstract record available.
Inventors
- 👤 Osterberg Harold
- 👤 Alva H Bennett
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-24 03:08
CPC Classifications
G; G02; G02B; G02B21/00; G02B21/06; G02B21/08; G02B21/14
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US60109A
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DE636168C
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FR839173A
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US2186619A
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US2481660A
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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) | 1958-01-31 | 1958-08-02 | 1959-02-01 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1962-01-31 | 1962-08-02 | 1963-02-01 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1966-01-31 | 1966-08-02 | 1967-02-01 | $7700.00 | Window Closed / Lapsed |