US3256444A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Time ratio spectrophotometers
Assignee: National Research Development Corp UK
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Filing: 1962-09-04
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Granted: 1966-06-14
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Expires: 1982-09-04
Abstract
No abstract record available.
Inventors
- 👤 Jones Owen Charles
- 👤 Clarke Frank Joseph John
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-06 17:18
CPC Classifications
G; G01; G01J; G01J1/00; G01J1/10; G01J1/20; G01J1/22; G01J1/24
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
113 words
PHOTOMETRIC APPARATUS COMPRISING MEANS FOR DIRECTING A FIRST BEAM OF RADIATION AND A SECOND BEAM OF RADIATION THE SECOND OF WHICH THE INTENSITY IS TO BE DETERMINED, ONTO A PHOTOSENSITIVE FLUX AVERAGING NULL DETECTOR, AN ATTENUATOR FOR REDUCING THE AVERAGE INTENSITY OF THE RADIATION IN THE SAID FIRST BEAM TO A VALUE EQUAL TO THAT TO BE DETERMINED, SAID ATTENUATOR COMPRISING A REPETITIVE SHUTTER OF WHICH THE OPEN TIME TO SHUT TIME CAN BE ADJUSTED OVER A SUBSTANTIAL RANGE SO AS TO REDUCE THE AVERAGE INTENSITY OF THE FIRST BEAM, AND MEANS FOR DETERMINING THE EXTENT OF REDUCTION OF AVERAGE INTENSITY OF MEASURING THE ON TO OFF TIME RATIO OF THE FIRST BEAM.
Claim 2
Dependent Claim
113 words
PHOTOMETRIC APPARATUS COMPRISING MEANS FOR DIRECTING A FIRST BEAM OF RADIATION AND A SECOND BEAM OF RADIATION THE SECOND OF WHICH THE INTENSITY IS TO BE DETERMINED, ONTO A PHOTOSENSITIVE FLUX AVERAGING NULL DETECTOR, AN ATTENUATOR FOR REDUCING THE AVERAGE INTENSITY OF THE RADIATION IN THE SAID FIRST BEAM TO A VALUE EQUAL TO THAT TO BE DETERMINED, SAID ATTENUATOR COMPRISING A REPETITIVE SHUTTER OF WHICH THE OPEN TIME TO SHUT TIME CAN BE ADJUSTED OVER A SUBSTANTIAL RANGE SO AS TO REDUCE THE AVERAGE INTENSITY OF THE FIRST BEAM, AND MEANS FOR DETERMINING THE EXTENT OF REDUCTION OF AVERAGE INTENSITY OF MEASURING THE ON TO OFF TIME RATIO OF THE FIRST BEAM.
References Cited (Backward Citations)
US1919182A
Cited
US2766653A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1969-06-13 | 1969-12-13 | 1970-06-14 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1973-06-13 | 1973-12-13 | 1974-06-14 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1977-06-13 | 1977-12-13 | 1978-06-14 | $7700.00 | Window Closed / Lapsed |