Patent EP0582533A1 successfully refreshed from Google Patents.
US3529894A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Interferometer employing a plurality of pairs of interfering beams
Assignee: Ernst Leitz Wetzlar GmbH
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Filing: 1968-01-22
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Granted: 1970-09-22
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Expires: 1988-01-22
Abstract
No abstract record available.
Inventors
- 👤 Fromund Hock
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 21:10
CPC Classifications
G; G01; G01B; G01B9/00; G01B9/02; G01B9/02055; G01B9/02075; G01B9/02078; G01B9/02079; G01B9/02081; G01B2290/00; G01B2290/70
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) | 1973-09-21 | 1974-03-23 | 1974-09-22 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1977-09-21 | 1978-03-23 | 1978-09-22 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1981-09-21 | 1982-03-23 | 1982-09-22 | $7700.00 | Window Closed / Lapsed |