Patent US1556982A successfully refreshed from Google Patents.
US1556982A
Expired / Lapsed
US
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Means for softening the contours of the images of photographic objectives
Assignee: FIRM OF OPTISCHE ANSTALT C P G
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Filing: 1921-09-03
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Granted: 1925-10-13
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Expires: 1941-09-03
Abstract
No abstract record available.
Inventors
- 👤 Weidert Franz
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-28 15:17
CPC Classifications
G; G02; G02B; G02B13/00; G02B13/20
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
No citation records indexed.
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1928-10-12 | 1929-04-13 | 1929-10-13 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1932-10-12 | 1933-04-13 | 1933-10-13 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1936-10-12 | 1937-04-13 | 1937-10-13 | $7700.00 | Window Closed / Lapsed |