US3845400A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Signal analyzing apparatus
Assignee: Eastman Kodak Co
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Filing: 1973-10-18
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Granted: 1974-10-29
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Expires: 1993-10-18
Abstract
Abstract A photometer is disclosed in which the light transmitted by reference and sample substances is alternately sampled to obtain an output voltage representing the sample density and the photometer sensitivity is varied as a function of this output voltage during the sampling of light transmitted by the sample substance.
Inventors
- 👤 Y Yee
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-08 02:00
CPC Classifications
G; G01; G01J; G01J1/00; G01J1/10; G01J1/16; G01N; G01N21/00; G01N21/17; G01N21/25; G01N21/27; G01N21/274; G06; G06G; G06G7/00; G06G7/48; G06G7/75
Claims Analysis
Total Claims: 6
Claim 1
Independent Claim
103 words
In a system for analyzing a variable signal of unknown magnitude received from a source, the combination comrpising; comprising; a substantially constant reference signal; means for alternately sampling said variable signal and said reference signal repetitively; means for generating an output voltage representing the difference in magnitude between said variable signal and said reference signal; sensitivity control means responsive to said output voltage of a selected amplitude for altering the system sensitivity from a first level to a second level during the next sample of said variable signal; and means for converting said output voltage into data representing a characteristic of said source.
Claim 2
Dependent Claim
103 words
In a system for analyzing a variable signal of unknown magnitude received from a source, the combination comrpising; comprising; a substantially constant reference signal; means for alternately sampling said variable signal and said reference signal repetitively; means for generating an output voltage representing the difference in magnitude between said variable signal and said reference signal; sensitivity control means responsive to said output voltage of a selected amplitude for altering the system sensitivity from a first level to a second level during the next sample of said variable signal; and means for converting said output voltage into data representing a characteristic of said source.
Claim 3
Dependent Claim
25 words
The system of claim 1 wherein said sensitivity control means returns said system sensitivity to said first level during a sample of said reference signal.
Claim 4
Dependent Claim
51 words
The system of claim 1 wherein said sensitivity control means further comprises; means for generating a timing signal indicating the interval during which said variable signal is sampled; and means responsive to said timing signal and said output voltage of a selected amplitude for increasing said system sensitivity during said interval.
Claim 5
Dependent Claim
82 words
The system of claim 3 wherein said means responsive to said timing signal and said output voltage further comprises; a comparator for generating a first sensitivity control signal when the amplitude of said output voltage is greater than or equal to a first threshold voltage; and circuit means responsive to said timing signal and said first sensitivity control signal for increasing said system sensitivity from a first level to a second level during said interval in which said variable signal is sampled.
Claim 6
Dependent Claim
62 words
The system of claim 4 wherein said comparator generates a second sensitivity control signal when the amplitude of said output voltage is less than or equal to a second threshold voltage; and said circuit means is responsive to said timing signal and second sensitivity control signal for maintaining said system sensitivity at said first level during a sample of said variable signal.
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USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1977-10-28 | 1978-04-29 | 1978-10-29 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1981-10-28 | 1982-04-29 | 1982-10-29 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1985-10-28 | 1986-04-29 | 1986-10-29 | $7700.00 | Window Closed / Lapsed |