Patent US3561872A successfully refreshed from Google Patents.
US3561872A
Expired / Lapsed
US
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Electronic spectrophotometer
Assignee: Polish Academy of Sciences
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Filing: 1966-02-14
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Granted: 1971-02-09
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Expires: 1986-02-14
Abstract
Abstract AN ELECTRONIC SPECTROPHOTOMETER COMPRISES A MOVABLE LIGHT SOURCE IN FRONT OF A LUMINOUS SPOT ON A PHOSPHOR SCREEN OF A CATHODE-RAY TUBE AND A BEAM SPLITTER WHICH SPLITS A RADIATION BEAM AT AN EXIT OF A MONOCHROMATOR INTO A TEST BEAM AND A REFERENCE BEAM, A PHOTOELECTRIC DETECTOR OF THE TEST BEAM BEING COUPLED THROUGH A NEGATIVE FEEDBACK CIRCUIT TO THE ELECTRIC GUN OF THE CATHODE RAY TUBE SO THAT THE OUTPUT OF THE DETECTOR IS AT A CONSTANT LEVEL INDEPENDENT OF THE WAVELENGTH OF THE RADIATION IMPINGING ON THE DETECTOR SO THAT A SECOND DETECTOR IN THE PATH OF THE TEST BEAM WHICH PASSES THROUGH A SAMPLE HAS AN OUTPUT DIRECTLY PROPORTIONAL TO THE TRANSMITTANCE OF THE SAMPLE.
Inventors
- 👤 Zbigniew Ryszard Grabowski
- 👤 Jozef Koszewski
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-22 19:34
CPC Classifications
G; G01; G01J; G01J3/00; G01J3/28; G01J3/42; G01J3/2889
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
No citation records indexed.
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1974-02-08 | 1974-08-10 | 1975-02-09 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1978-02-08 | 1978-08-10 | 1979-02-09 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1982-02-08 | 1982-08-10 | 1983-02-09 | $7700.00 | Window Closed / Lapsed |