Patent US3071037A successfully refreshed from Google Patents.
US3071037A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Ratio measuring spectrophotometer
Assignee: Bausch and Lomb Inc
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Filing: 1958-09-22
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Granted: 1963-01-01
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Expires: 1978-09-22
Abstract
No abstract record available.
Inventors
- 👤 Corwin H Brumley
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 14:11
CPC Classifications
G; G01; G01J; G01J3/00; G01J3/28; G01J3/42
Claims Analysis
Total Claims: 1
Claim 1
Independent Claim
103 words
A DOUBLE BEAM SPECTROPHOTOMETER COMPRISING, SIGNAL PRODUCING MEANS PRODUCING A REFERENCE AND A TEST ELECTRICAL SIGNAL RESPONSIVE RESPECTIVELY TO A REFERENCE CONDITION AND TO A TEST CONDITION BEING INVESTIGATED, COMMON AMPLIFYING MEANS AMPLIFYING THE REFERENCE AND TEST SIGNALS, CIRCUIT MEANS SENSING AND RECORDING THE RATIO BETWEEN SAID REFERENCE AND TEST ELECTRICAL SIGNALS, A STANDARD SIGNAL GENERATOR GENERATING A STANDARD SIGNAL, A DIFFERENCE DETECTION CIRCUIT COUPLED TO SAID STANDARD SIGNAL GENERATOR AND SAID ELECTRICAL SIGNAL PRODUCING MEANS FOR DETECTING A DIFFERENCE SIGNAL BETWEEN THE STANDARD SIGNAL AND THE REFERENCE SIGNAL, A FEEDBACK CIRCUIT CONNECTED TO SAID DIFFERENCE DETECTION CIRCUIT AND SAID AMPLIFYING MEANS TO
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USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1965-12-31 | 1966-07-02 | 1967-01-01 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1969-12-31 | 1970-07-02 | 1971-01-01 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1973-12-31 | 1974-07-02 | 1975-01-01 | $7700.00 | Window Closed / Lapsed |