Patent US3018258A successfully refreshed from Google Patents.
US3872301A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Automatically temperature-compensated electro-optic circuit
Assignee: Warner Lambert Co LLC
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Filing: 1974-03-15
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Granted: 1975-03-18
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Expires: 1994-03-15
Abstract
Abstract An automatically temperature-compensated electro-optic circuit. There is disclosed an electro-optic circuit including optical mask, light emitting diodes, and photo transistors coupled with operational amplifier circuitry to provide automatic compensation for variations in parameters of the light emitting diodes and photo transistors due to temperature variations. With the inclusion of the invention in an electro-medical monitor an output signal is thus maintained approximately constant for a given position of optical mask regardless of temperature variations.
Inventors
- 👤 Mandred Joppich
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 18:25
CPC Classifications
G; G01; G01D; G01D5/00; G01D5/26; G01D5/32; G01D5/34
Claims Analysis
Total Claims: 12
Claim 1
Independent Claim
76 words
An electro-optic circuit for automatically temperature compensating parameter variations in said circuit resulting from ambient temperature variations, said electro-optic circuit comprising a power supply, electro-optic means for generating at least two signals, means for sensing said parameter variations by obtaining the sum and difference of said signals, means utilizing said sum of said signals for automatically controlling said generating means to maintain said signals approximately constant, and output means for utilizing said difference of said signals.
Claim 2
Dependent Claim
76 words
An electro-optic circuit for automatically temperature compensating parameter variations in said circuit resulting from ambient temperature variations, said electro-optic circuit comprising a power supply, electro-optic means for generating at least two signals, means for sensing said parameter variations by obtaining the sum and difference of said signals, means utilizing said sum of said signals for automatically controlling said generating means to maintain said signals approximately constant, and output means for utilizing said difference of said signals.
Claim 3
Dependent Claim
40 words
An electro-optic circuit as recited in claim 1 and wherein said electro-optic means comprIses an optical mask containing apertures, means for shining light on said mask and through said apertures, and means for converting said shined-through light to electrical signals.
Claim 4
Dependent Claim
79 words
An electro-optic circuit as recited in claim 2 and wherein said light-shining means comprises at least two series-connected current-controlled light emitting diodes powered by said power supply, at least one of said at least two diodes including first means for shining light on said mask and through only one of said apertures, and at least the other one of said at least two diodes including means for shining light on said mask and through only another of said apertures.
Claim 5
Dependent Claim
16 words
An electro-optic circuit as recited in claim 3 and wherein said converting means comprises photo transistors.
Claim 6
Dependent Claim
46 words
An electro-optic circuit as recited in claim 4 wherein said apertures are two in number and are fashioned in a triangularly tapered manner and wherein the large end portion of one aperture is located adjacent the small apex portion of the other aperture and vice versa.
Claim 7
Dependent Claim
29 words
An electro-optic circuit as recited in claim 5 including means for moving said mask so that the intensity of the combined light shined through said two apertures remains constant.
Claim 8
Dependent Claim
33 words
An electro-optic circuit as recited in claim 6 and wherein said sensing means includes first operational amplifier means for obtaining said signal sum and second operational amplifier means for obtaining said signal difference.
Claim 9
Dependent Claim
33 words
An electro-optic circuit as recited in claim 2 and wherein said sensing means includes first operational amplifier means for obtaining said signal sum and second operational amplifier means for obtaining said signal difference.
Claim 10
Dependent Claim
49 words
An electro-optic circuit as recited in claim 8 and wherein said automatic controlling means comprises transistor means responsive to the output of said first operational amplifier means and connected in series with said light emitting diodes and said supply for controlling the current flow through said light emitting diodes.
Claim 11
Dependent Claim
48 words
An electro-optic circuit as recited in claim 7 and wherein said automatic controlling means comprises transistor means responsive to the output of said first operational amplifier means and connected in series with said light emitting diodes and said supply for controlling the current flow through said emitting diodes.
Claim 12
Dependent Claim
30 words
An electro-optic circuit as recited in claim 10 and wherein said light emitting diodes are constructed from gallium arsenide material and wherein said photo transistors are constructed from silicon material.
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) | 1978-03-17 | 1978-09-16 | 1979-03-18 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1982-03-17 | 1982-09-16 | 1983-03-18 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1986-03-17 | 1986-09-16 | 1987-03-18 | $7700.00 | Window Closed / Lapsed |