Patent US3049711A successfully refreshed from Google Patents.
US2484972A
Expired / Lapsed
US
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Optical comparison projecting apparatus having interchangeable objectives and condensers
Assignee: Individual
•
Filing: 1947-05-16
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Granted: 1949-10-18
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Expires: 1967-05-16
Abstract
No abstract record available.
Inventors
- 👤 Turrettini Fernand
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 20:11
CPC Classifications
G; G02; G02B; G02B21/00; G02B21/0004; G02B21/0016
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US1989691A
Cited
US2230573A
Cited
US2209532A
Cited
US2226618A
Cited
US2313639A
Cited
CH218409A
Cited
CH218410A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1952-10-17 | 1953-04-18 | 1953-10-18 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1956-10-17 | 1957-04-18 | 1957-10-18 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1960-10-17 | 1961-04-18 | 1961-10-18 | $7700.00 | Window Closed / Lapsed |