Patent US2425758A successfully refreshed from Google Patents.
US2425758A
Expired / Lapsed
US
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Photographic apparatus for recording interference phenomena
Assignee: Individual
•
Filing: 1944-04-27
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Granted: 1947-08-19
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Expires: 1964-04-27
Abstract
No abstract record available.
Inventors
- 👤 James B Saunders
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-22 21:39
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)
US1709809A
Cited
FR550424A
Cited
US1573401A
Cited
US1625625A
Cited
FR604860A
Cited
GB367859A
Cited
US2320350A
Cited
US2401530A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1950-08-18 | 1951-02-17 | 1951-08-19 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1954-08-18 | 1955-02-17 | 1955-08-19 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1958-08-18 | 1959-02-17 | 1959-08-19 | $7700.00 | Window Closed / Lapsed |