Patent US2647434A successfully refreshed from Google Patents.
US2647434A
Expired / Lapsed
US
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Interferometer using liquid mirrors
Assignee: Individual
•
Filing: 1950-07-25
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Granted: 1953-08-04
•
Expires: 1970-07-25
Abstract
No abstract record available.
Inventors
- 👤 Theodor W Zobel
- 👤 Mirus Ferdinand
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-26 16:17
CPC Classifications
G; G01; G01N; G01N21/00; G01N21/17; G01N21/41; G01N21/45
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
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Cited
US1044502A
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US1598106A
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US1939088A
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US2015730A
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US2256855A
Cited
FR888644A
Cited
US2460836A
Cited
US2555387A
Cited
US2541437A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1956-08-03 | 1957-02-02 | 1957-08-04 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1960-08-03 | 1961-02-02 | 1961-08-04 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1964-08-03 | 1965-02-02 | 1965-08-04 | $7700.00 | Window Closed / Lapsed |