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US2490345A
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Light absorption cell
Assignee: Phillips Petroleum Co
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Filing: 1947-06-30
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Granted: 1949-12-06
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Expires: 1967-06-30
Abstract
No abstract record available.
Inventors
- 👤 William R Flatford
- 👤 Crawford Francis Weldon
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-24 06:28
CPC Classifications
G; G01; G01N; G01N21/00; G01N21/01; G01N21/03; G01N2021/0346
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US1954925A
Cited
US2051317A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1952-12-05 | 1953-06-06 | 1953-12-06 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1956-12-05 | 1957-06-06 | 1957-12-06 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1960-12-05 | 1961-06-06 | 1961-12-06 | $7700.00 | Window Closed / Lapsed |