Patent US2589604A successfully refreshed from Google Patents.
Patent US4068677A successfully refreshed from Google Patents.
US4068677A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Process control circuit for metal-depositing baths
Assignee: Siemens AG
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Filing: 1976-05-21
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Granted: 1978-01-17
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Expires: 1996-05-21
Abstract
Abstract A process control circuit which is adapted for the control and monitoring of a plurality of parameters in one or more metal-depositing baths, has parameter control circuit blocks for each of the parameters to be measured. Each of the parameter control circuit blocks has a measuring stage for producing a measured value corresponding to one of the parameters, a calibration stage for calibrating the measuring stage, a comparison stage for comparing the measured value to a stored nominal value, and a dosing circuit which is connected to the comparator and which doses the metal-depositing bath in response to a comparison signal from the comparator.
Inventors
- 👤 Hubert De Steur
- 👤 Wolfgang Pernegger
- 👤 Egon Bussmann
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-29 06:04
CPC Classifications
G; G05; G05D; G05D21/00; G05D21/02; C; C25; C25D; C25D21/00; C25D21/12; Y; Y10; Y10T; Y10T137/00; Y10T137/2496; Y10T137/2499; Y10T137/2509
Claims Analysis
Total Claims: 12
Claim 1
Independent Claim
201 words
A process control circuit adapted for the simultaneous and repeated control and monitoring of a plurality of parameters in at least one metal-depositing bath, comprising: a. an independent parameter control circuit block for each of said plurality of parameters, each block having i. measuring means for producing a measured value for one of said parameters; ii. calibrator means connected to the measuring means for calibrating said measuring means; iii. comparator means connected to said measuring means for comparing said measured value to a nominal value stored in said comparator means and creating a comparison signal; iv. a dosing means connected to said comparator means for dosing said metal-depositing bath in response to said comparison signal; b. a program generator means connected to each of the parameter control circuit blocks for controlling the operation of each in a simultaneous fashion so as to simultaneously control and monitor the bath parameters, said program generator means including at least i. first switch means in each parameter circuit block for activating the calibrator means, and ii. second switch means in each parameter circuit block for activating the measuring, comparator and dosing means to maintain tight control over the value of each parameter in the bath.
Claim 2
Dependent Claim
201 words
A process control circuit adapted for the simultaneous and repeated control and monitoring of a plurality of parameters in at least one metal-depositing bath, comprising: a. an independent parameter control circuit block for each of said plurality of parameters, each block having i. measuring means for producing a measured value for one of said parameters; ii. calibrator means connected to the measuring means for calibrating said measuring means; iii. comparator means connected to said measuring means for comparing said measured value to a nominal value stored in said comparator means and creating a comparison signal; iv. a dosing means connected to said comparator means for dosing said metal-depositing bath in response to said comparison signal; b. a program generator means connected to each of the parameter control circuit blocks for controlling the operation of each in a simultaneous fashion so as to simultaneously control and monitor the bath parameters, said program generator means including at least i. first switch means in each parameter circuit block for activating the calibrator means, and ii. second switch means in each parameter circuit block for activating the measuring, comparator and dosing means to maintain tight control over the value of each parameter in the bath.
Claim 3
Dependent Claim
26 words
The circuit of claim 1 in which a temperature compensation means is connected to said measuring means for adjusting the measured value in response to temperature.
Claim 4
Dependent Claim
22 words
The circuit of claim 1 in which said calibrator means has a motor for driving a calibration control in said measuring means.
Claim 5
Dependent Claim
42 words
The circuit of claim 1 in which a program control means is connected to said measuring stage calibrator means and dosing means for controlling automatic callibration prior to filling said metal-depositing bath and for controlling measurement and dosing of said metal-depositing bath.
Claim 6
Dependent Claim
56 words
The circuit of claim 1 in which the measuring means in each of said parameter control circuit blocks has a measured value storage means connected thereto; and a boundary level monitor means being connected to each of said storage means for shutting off said dosing circuit when a boundary level is violated by the measured value.
Claim 7
Dependent Claim
35 words
The circuit of claim 5 in which a plurality of metal-depositing baths are provided, and an interrogation means having indicators is connected to each storage means associated with each of said baths and circuit blocks.
Claim 8
Dependent Claim
45 words
The process control circuit of claim 1 in which at least one parameter control circuit block is connected to monitor and regulate bath fluid metal concentration, and at least one other parameter control circuit block is connected to monitor and regulate bath fluid pH value.
Claim 9
Dependent Claim
95 words
The process control circuit of claim 7 in which the parameter control circuit block connected to monitor and regulate metal concentration of the bath fluid has in its measuring stage a measuring photoconductive resistor and a comparison photoconductive resistor to form a two beam colorimeter, an amplifier, an automatically operating potentiometer having a center tap connected at the input of said amplifier, the measuring photoconductive resistor being arranged in a feedback line of the amplifier and also being connected to the potentiometer, the other end of the potentiometer being connected to the comparison photoconductive resistance.
Claim 10
Dependent Claim
32 words
The process control circuit of claim 1, characterized in that the calibrating device has a program switch connected to a servomotor, said servomotor driving an automatic calibrating control in said measuring circuit.
Claim 11
Dependent Claim
23 words
The circuit of claim 1 in which the program control generator automatically repeats calibration and dosing in each of the parameter control circuits.
Claim 12
Dependent Claim
36 words
The circuit of claim 1 in which measured value storage means are connected to each of the parameter control circuits, interrogation means also being provided for simultaneously interrogating measured values in each of the storage means.
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) | 1981-01-16 | 1981-07-18 | 1982-01-17 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1985-01-16 | 1985-07-18 | 1986-01-17 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1989-01-16 | 1989-07-18 | 1990-01-17 | $7700.00 | Window Closed / Lapsed |