US3437819A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Reflectance colorimeter with hybrid type stabilized amplifier
Assignee: Magnuson Corp
•
Filing: 1966-02-14
•
Granted: 1969-04-08
•
Expires: 1986-02-14
Abstract
No abstract record available.
Inventors
- 👤 Patrick M L Simmons
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-06 12:25
CPC Classifications
G; G01; G01N; G01N21/00; G01N21/17; G01N21/25; G01N21/27; H; H03; H03F; H03F5/00
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
119 words
IN A DIRECT READING REFLECTANCE COLORIMETER, THE COMBINATION OF A LIGHT-SENSITIVE CELL, MEANS ILLUMINATING A SPECIMEN TO BE COLOR GRADED, MEANS SUPPORTING SAID LIGHTSENSITIVE CELL SO THAT IT RECEIVES LIGHT REFLECTED FROM SAID ILLUMINATED SPECIMEN, AN AMPLIFIER HAVING THE INPUT CIRCUIT THEREOF CONNECTED TO SAID LIGHT-SENSITIVE CELL, SAID AMPLIFIER HAVING A OUTPUT CIRCUIT COMPRISING A BRIDGE CIRCUIT AND AN INDICATING INSTRUMENT CONNECTED TO SAID BRIDGE CIRCUIT, A SOURCE OF CURRENT SUPPLY CONNECTED TO SAID AMPLIFIER, A PAIR OF TRANSISTORS CONNECTED TO TWO LEGS OF SAID BRIDGE CIRCUIT, ONE OF SAID TRANSISTORS FORMING THE OUTPUT STAGE OF SAID AMPLIFIER, AND MEANS EQUALIZING THE OPERATING TEMPERATURES OF SAID TRANSISTORS TO PREVENT UNEQUAL TEMPERATURES THEREOF FROM EFFECTING THE OPERATION OF SAID BRIDGE.
Claim 2
Dependent Claim
119 words
IN A DIRECT READING REFLECTANCE COLORIMETER, THE COMBINATION OF A LIGHT-SENSITIVE CELL, MEANS ILLUMINATING A SPECIMEN TO BE COLOR GRADED, MEANS SUPPORTING SAID LIGHTSENSITIVE CELL SO THAT IT RECEIVES LIGHT REFLECTED FROM SAID ILLUMINATED SPECIMEN, AN AMPLIFIER HAVING THE INPUT CIRCUIT THEREOF CONNECTED TO SAID LIGHT-SENSITIVE CELL, SAID AMPLIFIER HAVING A OUTPUT CIRCUIT COMPRISING A BRIDGE CIRCUIT AND AN INDICATING INSTRUMENT CONNECTED TO SAID BRIDGE CIRCUIT, A SOURCE OF CURRENT SUPPLY CONNECTED TO SAID AMPLIFIER, A PAIR OF TRANSISTORS CONNECTED TO TWO LEGS OF SAID BRIDGE CIRCUIT, ONE OF SAID TRANSISTORS FORMING THE OUTPUT STAGE OF SAID AMPLIFIER, AND MEANS EQUALIZING THE OPERATING TEMPERATURES OF SAID TRANSISTORS TO PREVENT UNEQUAL TEMPERATURES THEREOF FROM EFFECTING THE OPERATION OF SAID BRIDGE.
References Cited (Backward Citations)
US3016788A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1972-04-07 | 1972-10-07 | 1973-04-08 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1976-04-07 | 1976-10-07 | 1977-04-08 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1980-04-07 | 1980-10-07 | 1981-04-08 | $7700.00 | Window Closed / Lapsed |