US3843259A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Differential spectrophotometer
Assignee: Hitachi Ltd
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Filing: 1973-12-07
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Granted: 1974-10-22
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Expires: 1993-12-07
Abstract
Abstract A detected output signal of a detecting system of a spectrophotometer is applied as an input signal to a distributor in synchronism with an output of a pulse generator, and two output signals are delivered alternately from two output terminals respectively of the distributor in synchronism with the output of the pulse generator. These two output signals are applied to two memory circuits respectively, and the data (signals) stored respectively in the two memory circuits are subjected to subtraction. Alternate ones of the value obtained by subtraction of one of the signals from the other are applied to a polarity converter to appear as an output signal of the polarity converter.
Inventors
- 👤 S Tohyama
- 👤 Y Sugiura
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-26 19:27
CPC Classifications
G; G01; G01J; G01J3/00; G01J3/28; G01J3/42
Claims Analysis
Total Claims: 12
Claim 1
Independent Claim
127 words
A spectrophotometer comprising light wavelength scanning means including a dispersing element for dispersing light emitted from a light source and drive means for causing rotation of said dispersing element, means for directing the light coming from said light wavelength scanning means toward a sample solution, means for detecting light passed through said sample solution thereby obtaining a corresponding detected output signal, means for delivering said detected output signal in synchronism with the output of a pulse generator, means for distributing alternately said delivered output signal in synchronism with the output of said pulse generator, a pair of memory means for storing alternately said distributed output signal, and means for subtracting the memory content of one of said memory means from that of the other said memory means.
Claim 2
Dependent Claim
127 words
A spectrophotometer comprising light wavelength scanning means including a dispersing element for dispersing light emitted from a light source and drive means for causing rotation of said dispersing element, means for directing the light coming from said light wavelength scanning means toward a sample solution, means for detecting light passed through said sample solution thereby obtaining a corresponding detected output signal, means for delivering said detected output signal in synchronism with the output of a pulse generator, means for distributing alternately said delivered output signal in synchronism with the output of said pulse generator, a pair of memory means for storing alternately said distributed output signal, and means for subtracting the memory content of one of said memory means from that of the other said memory means.
Claim 3
Dependent Claim
22 words
An apparatus as claimed in claim 1, wherein said drive means includes a pulse motor which is driven by said pulse generator.
Claim 4
Dependent Claim
15 words
An apparatus as claimed in claim 1, wherein said drive means includes a synchronous motor.
Claim 5
Dependent Claim
21 words
An apparatus as claimed in claim 1, wherein a switching means is connected between said detecting means and said distributing means.
Claim 6
Dependent Claim
58 words
An apparatus as claimed in claim 3, comprising means including a rotary member for converting continuous light emitted from the light source into intermittent light, means for detecting said intermittent light, and means for detecting the light passed through said sample solution in synchronism with said detected intermittent signal so as to obtain a corresponding detected output signal.
Claim 7
Dependent Claim
27 words
An apparatus as claimed in claim 1, comprising polarity converting means for converting the polarity of alternate ones of the result of subtraction by said subtracting means.
Claim 8
Dependent Claim
27 words
An apparatus as claimed in claim 5, comprising polarity converting means for converting the polarity of alternate ones of the result of subtraction by said subtracting means.
Claim 9
Dependent Claim
144 words
A spectrophotometer comprising light wavelength scanning means including a dispersing element for dispersing light emitted from a light source and drive means for causing rotation of said dispersing element, means for directing the light coming from said light wavelength scanning means toward a sample solution, means for detecting the light passed through said sample solution thereby obtaining a corresponding detected output signal, and means including a plurality of differentiating means connected in series, each said differentiating means including means for delivering said detected output signal in synchronism with the output of a pulse generator, means for distributing alternately said delivered output signal in synchronism with the output of said pulse generator, a pair of memory means for storing alternately said distributed output signal, and means for subtracting the memory content of one of said memory means from that of the other said memory means.
Claim 10
Dependent Claim
144 words
A spectrophotometer comprising light wavelength scanning means including a dispersing element for dispersing light emitted from a light source and drive means for causing rotation of said dispersing element, means for directing the light coming from said light wavelength scanning means toward a sample solution, means for detecting the light passed through said sample solution thereby obtaining a corresponding detected output signal, and means including a plurality of differentiating means connected in series, each said differentiating means including means for delivering said detected output signal in synchronism with the output of a pulse generator, means for distributing alternately said delivered output signal in synchronism with the output of said pulse generator, a pair of memory means for storing alternately said distributed output signal, and means for subtracting the memory content of one of said memory means from that of the other said memory means.
Claim 11
Dependent Claim
21 words
An apparatus as claimed in claim 8, wherein a switching means is connected to the input of each said differentiating means.
Claim 12
Dependent Claim
27 words
An apparatus as claimed in claim 8, comprising polarity converting means for converting the polarity of alternate ones of the result of subtraction by said subtracting means.
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) | 1977-10-21 | 1978-04-22 | 1978-10-22 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1981-10-21 | 1982-04-22 | 1982-10-22 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1985-10-21 | 1986-04-22 | 1986-10-22 | $7700.00 | Window Closed / Lapsed |