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US2551833A
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Recording spectrophotometer
Assignee: STWB Inc
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Filing: 1947-09-27
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Granted: 1951-05-08
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Expires: 1967-09-27
Abstract
No abstract record available.
Inventors
- 👤 Galen W Ewing
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 22:30
CPC Classifications
G; G01; G01J; G01J3/00; G01J3/46; G01J3/50; G01J3/51; G01J3/02; G01J3/08; G01J3/501
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US1746525A
Cited
US2304645A
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US2176013A
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US2218357A
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US2328293A
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US2388105A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1954-05-07 | 1954-11-06 | 1955-05-08 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1958-05-07 | 1958-11-06 | 1959-05-08 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1962-05-07 | 1962-11-06 | 1963-05-08 | $7700.00 | Window Closed / Lapsed |