Patent US2571937A successfully refreshed from Google Patents.
US2571937A
Expired / Lapsed
US
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Interferometer with right-angle reflector surfaces at end of each divided beam
Assignee: Research Corp
•
Filing: 1948-08-27
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Granted: 1951-10-16
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Expires: 1968-08-27
Abstract
No abstract record available.
Inventors
- 👤 Edson R Peck
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-22 21:02
CPC Classifications
G; G01; G01B; G01B9/00; G01B9/02
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US1455795A
Cited
US1625625A
Cited
DE489880C
Cited
US1901632A
Cited
GB555672A
Cited
US2462292A
Cited
GB595940A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1954-10-15 | 1955-04-16 | 1955-10-16 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1958-10-15 | 1959-04-16 | 1959-10-16 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1962-10-15 | 1963-04-16 | 1963-10-16 | $7700.00 | Window Closed / Lapsed |