Patent US3446547A successfully refreshed from Google Patents.
US3446547A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Projection objective for microfilm enlargers
Assignee: CAPS RES Ltd
•
Filing: 1965-09-09
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Granted: 1969-05-27
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Expires: 1985-09-09
Abstract
No abstract record available.
Inventors
- 👤 John H Jeffree
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-01 23:07
CPC Classifications
G; G02; G02B; G02B1/00; G02B13/00
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US2586866A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1972-05-26 | 1972-11-25 | 1973-05-27 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1976-05-26 | 1976-11-25 | 1977-05-27 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1980-05-26 | 1980-11-25 | 1981-05-27 | $7700.00 | Window Closed / Lapsed |