US3593119A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Electronic titrimeter
Assignee: Lubrizol Corp
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Filing: 1969-05-28
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Granted: 1971-07-13
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Expires: 1989-05-28
Abstract
Abstract Apparatus for electronically standardizing titration techniques by evaluating end point conditions utilizing a high gain, normalized, conductivity sensor comprising a pair of platinum electrodes immersed in the solution being titrated for affecting current conditions in a sensing circuit, the characteristics of the circuit being monitored by a variable gain integrated circuit operational amplifier and DC meter indicating combination.
Inventors
- 👤 Thomas W Brum
- 👤 Frank E Cochran
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 15:53
CPC Classifications
G; G01; G01N; G01N31/00; G01N31/16
Claims Analysis
Total Claims: 4
Claim 1
Independent Claim
213 words
Apparatus for monitoring the end point of titration, comprising a pair of electrodes of predetermined surface area completely submerged in the solution, plural resistors in series connection forming a first voltage divider, means connecting said electrodes across a portion of said first voltage divideR for energizing said pair of electrodes, a low voltage DC power source connected across said first voltage divider for creating current flow through the solution between said pair of electrodes, a second voltage divider, including a potentiometer, connected across said power source for creating a voltage level at the slider of said potentiometer determinative of a desired end point for the titration, a variable gain integrated circuit operational amplifier having a first input connected to a point on said portion of said first voltage divider and a second input connected to the slider of said potentiometer, said amplifier being operative to produce a voltage at the output terminal thereof related to the difference in voltages applied at said first and second inputs, a DC meter connected to said power supply and said output terminal for providing an indication of the voltage at said output terminal, and a variable resistor connected between said output terminal and said first input terminal of said amplifier for modifying the gain of said amplifier.
Claim 2
Dependent Claim
213 words
Apparatus for monitoring the end point of titration, comprising a pair of electrodes of predetermined surface area completely submerged in the solution, plural resistors in series connection forming a first voltage divider, means connecting said electrodes across a portion of said first voltage divideR for energizing said pair of electrodes, a low voltage DC power source connected across said first voltage divider for creating current flow through the solution between said pair of electrodes, a second voltage divider, including a potentiometer, connected across said power source for creating a voltage level at the slider of said potentiometer determinative of a desired end point for the titration, a variable gain integrated circuit operational amplifier having a first input connected to a point on said portion of said first voltage divider and a second input connected to the slider of said potentiometer, said amplifier being operative to produce a voltage at the output terminal thereof related to the difference in voltages applied at said first and second inputs, a DC meter connected to said power supply and said output terminal for providing an indication of the voltage at said output terminal, and a variable resistor connected between said output terminal and said first input terminal of said amplifier for modifying the gain of said amplifier.
Claim 3
Dependent Claim
60 words
Apparatus as set forth in claim 1 wherein said first voltage divider comprises first, second and third fixed resistors in series connection, said first resistor being of relatively high impedance and connected to said power source, said second and third resistors being connected to said pair of electrodes and having a common connection at the first input of said amplifier.
Claim 4
Dependent Claim
31 words
Apparatus as set forth in claim 2 further including a pair of zener diodes in back-to-back connection across said first and second inputs of said amplifier for limiting the voltage difference.
References Cited (Backward Citations)
US2972102A
Cited
US3441490A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1974-07-12 | 1975-01-11 | 1975-07-13 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1978-07-12 | 1979-01-11 | 1979-07-13 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1982-07-12 | 1983-01-11 | 1983-07-13 | $7700.00 | Window Closed / Lapsed |