US3383515A
Expired / Lapsed
US
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Dual beam null method and apparatus for determining the concentration of impurities in a sample
Assignee: Babcock and Wilcox Co
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Filing: 1964-08-21
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Granted: 1968-05-14
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Expires: 1984-08-21
Abstract
No abstract record available.
Inventors
- 👤 Robert V Cobb
- 👤 Earl E Coulter
- 👤 William T Hage
- 👤 James K Rice
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-27 11:29
CPC Classifications
G; G02; G02B; G02B7/00; G02B7/28; G02B7/36
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1971-05-14 | 1971-11-13 | 1972-05-14 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1975-05-14 | 1975-11-13 | 1976-05-14 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1979-05-14 | 1979-11-13 | 1980-05-14 | $7700.00 | Window Closed / Lapsed |