US2933972A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Photo-electric polarimeter
Assignee: Carl Zeiss AG
•
Filing: 1956-01-25
•
Granted: 1960-04-26
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Expires: 1976-01-25
Abstract
No abstract record available.
Inventors
- 👤 Wenking Hans
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 16:08
CPC Classifications
G; G01; G01J; G01J4/00; G01J4/04
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US548701A
Cited
DE664762C
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US1987441A
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US2126410A
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US2351539A
Cited
US2438422A
Cited
US2503808A
Cited
GB715057A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1963-04-26 | 1963-10-26 | 1964-04-26 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1967-04-26 | 1967-10-26 | 1968-04-26 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1971-04-26 | 1971-10-26 | 1972-04-26 | $7700.00 | Window Closed / Lapsed |