Patent US3522983A successfully refreshed from Google Patents.
US3522983A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Magnifying spectacles
Assignee: Carl Zeiss AG
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Filing: 1968-07-05
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Granted: 1970-08-04
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Expires: 1988-07-05
Abstract
No abstract record available.
Inventors
- 👤 Erwin Daniels
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-04 16:38
CPC Classifications
G; G02; G02B; G02B7/00; G02B7/002; G02B25/00; G02B25/002; G02B25/004; G02C; G02C7/00; G02C7/02; G02C7/08; G02C7/086; G02C7/088
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1973-08-03 | 1974-02-02 | 1974-08-04 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1977-08-03 | 1978-02-02 | 1978-08-04 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1981-08-03 | 1982-02-02 | 1982-08-04 | $7700.00 | Window Closed / Lapsed |