US3076375A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Colorimeter with linear absorbance scale
Assignee: Sunoco Inc
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Filing: 1960-07-29
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Granted: 1963-02-05
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Expires: 1980-07-29
Abstract
No abstract record available.
Inventors
- 👤 Conard K Donnell
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 20:15
CPC Classifications
G; G01; G01N; G01N21/00; G01N21/17; G01N21/25; G01N21/27
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
152 words
IN COMBINATION, MEANS FOR PROJECTING A BEAM OF LIGHT THROUGH A SAMPLE TO BE ANALYZED, A PHOTO-CONDUCTIVE RESISTOR RECEPTIVE OF THE LIGHT TRANSMITTED THROUGH SAID SAMPLE, MEANS CONNECTING SAID RESISTOR INTO A FOUR-ARM BRIDGE CIRCUIT AS A FIRST ARM THEREOF, SECOND, THIRD, AND FOURTH FIXED RESISTORS CONNECTED INTO SAID BRIDGE CIRCUIT AS RESPECTIVE ARMS THEREOF, THE JUNCTION BETWEEN SAID PHOTOCONDUCTIVE RESISTOR AND SAID SECOND RESISTOR AND THE JUNCTION BETWEEN SAID THIRD AND FOURTH RESISTORS DEFINING ONE DIAGONAL OF SAID BRIDGE; A LOGARITHMIC AMPLIFIER CONSTRUCTED AND ARRANGED TO PROVIDE AN OUTPUT PROPORTIONAL TO THE LOGARITHM OF THE RATIO BETWEEN TWO INPUT VOLTAGES APPLIED SEPARATELY TO SAID AMPLIFIER, MEANS APPLYING THE VOLTAGE ACROSS SAID ONE BRIDGE DIAGONAL TO SAID AMPLIFIER AS ONE OF SAID INPUT VOLTAGES, MEANS APPLYING THE VOLTAGE ACROSS SAID SECOND FIXED RESISTOR TO SAID AMPLIFIER AS THE SECOND OF SAID INPUT VOLTAGES, AND MEANS FOR UTILIZING THE OUTPUT OF SAID AMPLIFIER.
Claim 2
Dependent Claim
152 words
IN COMBINATION, MEANS FOR PROJECTING A BEAM OF LIGHT THROUGH A SAMPLE TO BE ANALYZED, A PHOTO-CONDUCTIVE RESISTOR RECEPTIVE OF THE LIGHT TRANSMITTED THROUGH SAID SAMPLE, MEANS CONNECTING SAID RESISTOR INTO A FOUR-ARM BRIDGE CIRCUIT AS A FIRST ARM THEREOF, SECOND, THIRD, AND FOURTH FIXED RESISTORS CONNECTED INTO SAID BRIDGE CIRCUIT AS RESPECTIVE ARMS THEREOF, THE JUNCTION BETWEEN SAID PHOTOCONDUCTIVE RESISTOR AND SAID SECOND RESISTOR AND THE JUNCTION BETWEEN SAID THIRD AND FOURTH RESISTORS DEFINING ONE DIAGONAL OF SAID BRIDGE; A LOGARITHMIC AMPLIFIER CONSTRUCTED AND ARRANGED TO PROVIDE AN OUTPUT PROPORTIONAL TO THE LOGARITHM OF THE RATIO BETWEEN TWO INPUT VOLTAGES APPLIED SEPARATELY TO SAID AMPLIFIER, MEANS APPLYING THE VOLTAGE ACROSS SAID ONE BRIDGE DIAGONAL TO SAID AMPLIFIER AS ONE OF SAID INPUT VOLTAGES, MEANS APPLYING THE VOLTAGE ACROSS SAID SECOND FIXED RESISTOR TO SAID AMPLIFIER AS THE SECOND OF SAID INPUT VOLTAGES, AND MEANS FOR UTILIZING THE OUTPUT OF SAID AMPLIFIER.
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) | 1966-02-04 | 1966-08-06 | 1967-02-05 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1970-02-04 | 1970-08-06 | 1971-02-05 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1974-02-04 | 1974-08-06 | 1975-02-05 | $7700.00 | Window Closed / Lapsed |