Patent US2904686A successfully refreshed from Google Patents.
US2904686A
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US
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Double-nulling radiation comparison system
Assignee: Applied Biosystems Inc
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Filing: 1955-09-27
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Granted: 1959-09-15
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Expires: 1975-09-27
Abstract
No abstract record available.
Inventors
- 👤 Carl R Sebens
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 15:53
CPC Classifications
G; G01; G01N; G01N21/00; G01N21/17; G01N21/25; G01N21/31; G01N21/35; G01J; G01J1/00; G01J1/10; G01J1/20; G01J1/22; G01J1/24; G01N21/3504; G01N21/3577
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) | 1962-09-14 | 1963-03-16 | 1963-09-15 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1966-09-14 | 1967-03-16 | 1967-09-15 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1970-09-14 | 1971-03-16 | 1971-09-15 | $7700.00 | Window Closed / Lapsed |