US2269674A
Expired / Lapsed
US
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Method for photometric analysis
Assignee: Wyeth Holdings LLC
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Filing: 1939-08-22
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Granted: 1942-01-13
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Expires: 1959-08-22
Abstract
No abstract record available.
Inventors
- 👤 Liddel Urner
- 👤 Barnes Robert Bowling
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-22 21:02
CPC Classifications
G; G01; G01N; G01N21/00; G01N21/17; G01N21/25; G01N21/31; G01N21/33; Y; Y10; Y10T; Y10T137/00; Y10T137/0318; Y10T137/0324; Y10T137/0329; Y10T137/0335
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
No citation records indexed.
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1945-01-12 | 1945-07-14 | 1946-01-13 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1949-01-12 | 1949-07-14 | 1950-01-13 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1953-01-12 | 1953-07-14 | 1954-01-13 | $7700.00 | Window Closed / Lapsed |