US3533685A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Variable incidence type slit lamp
Assignee: Carl Zeiss AG
•
Filing: 1968-10-28
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Granted: 1970-10-13
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Expires: 1988-10-28
Abstract
No abstract record available.
Inventors
- 👤 Gert Littmann
- 👤 Hans Littmann
- 👤 Max Straube
- 👤 Hans Peter Worner
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 20:38
CPC Classifications
A; A61; A61B; A61B3/00; A61B3/10; A61B3/13; A61B3/135; G; G02; G02B; G02B7/00; G02B7/02; G02B7/04
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US3405994A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1973-10-12 | 1974-04-13 | 1974-10-13 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1977-10-12 | 1978-04-13 | 1978-10-13 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1981-10-12 | 1982-04-13 | 1982-10-13 | $7700.00 | Window Closed / Lapsed |