US2543856A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Large aperture four-member photographic objective
Assignee: MEOPTA SPOJENE ZAVODY PRO JEMNOU MECHANIKU A OPTIKU
•
Filing: 1948-07-20
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Granted: 1951-03-06
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Expires: 1968-07-20
Abstract
No abstract record available.
Inventors
- 👤 Kupka Frantisek
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-04 00:29
CPC Classifications
G; G02; G02B; G02B9/00; G02B9/34
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US1584271A
Cited
US1708863A
Cited
US2170428A
Cited
US2297452A
Cited
US2399858A
Cited
US2449769A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1954-03-05 | 1954-09-04 | 1955-03-06 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1958-03-05 | 1958-09-04 | 1959-03-06 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1962-03-05 | 1962-09-04 | 1963-03-06 | $7700.00 | Window Closed / Lapsed |