Patent US3402976A successfully refreshed from Google Patents.
US3402976A
Expired / Lapsed
US
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Stereoscopic double-microscope
Assignee: Carl Zeiss AG
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Filing: 1965-07-01
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Granted: 1968-09-24
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Expires: 1985-07-01
Abstract
No abstract record available.
Inventors
- 👤 Littmann Hans
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-08 10:59
CPC Classifications
G; G02; G02B; G02B21/00; G02B21/18; G02B21/20; G02B21/22
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US983569A
Cited
US1873149A
Cited
GB396325A
Cited
US2634654A
Cited
US2857523A
Cited
US2901943A
Cited
US3062099A
Cited
US3173984A
Cited
US3186300A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1971-09-24 | 1972-03-25 | 1972-09-24 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1975-09-24 | 1976-03-25 | 1976-09-24 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1979-09-24 | 1980-03-25 | 1980-09-24 | $7700.00 | Window Closed / Lapsed |