US4142957A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Method and arrangement for heating workpieces to desired temperatures
Assignee: Kloeckner Ionon GmbH
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Filing: 1977-10-19
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Granted: 1979-03-06
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Expires: 1997-10-19
Abstract
Abstract The method comprises the measurement of the actual temperature of the workpiece in the container, forming a time derivative value proportional to the rate of change of the measured actual temperature value, comparing the time derivative value with a predetermined or desired treatment temperature value to produce a comparison value and continuously readjusting the glow discharge current proportionally to the comparison value so that no abrupt changes in the glow discharge current takes place.
Inventors
- 👤 Werner Oppel
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-25 11:49
CPC Classifications
H; H01; H01J; H01J37/00; H01J37/32; H01J37/32009; H01J37/32018; C; C21; C21D; C21D1/00; C21D1/34; C21D1/38; C23; C23C; C23C8/00; C23C8/06; C23C8/36; G; G05; G05D; G05D23/00; G05D23/19; G05D23/1906; G05D23/20; H01J37/32917; H01J37/32935
Claims Analysis
Total Claims: 4
Claim 1
Independent Claim
82 words
A method for the automatic heating and uniform readjustment of a temperature raise to a specified treatment temperature of a workpiece treated by means of current-intensive glow discharge in a container, comprising the steps of measuring the actual temperature of the workpiece in the container; forming a time derivative of the measured actual temperature value; comparing the time derivative value with the specified treatment temperature value to produce a comparison value; and readjusting the glow discharge current corresponding to said comparison value.
Claim 2
Independent Claim
82 words
A method for the automatic heating and uniform readjustment of a temperature raise to a specified treatment temperature of a workpiece treated by means of current-intensive glow discharge in a container, comprising the steps of measuring the actual temperature of the workpiece in the container; forming a time derivative of the measured actual temperature value; comparing the time derivative value with the specified treatment temperature value to produce a comparison value; and readjusting the glow discharge current corresponding to said comparison value.
Claim 3
Dependent Claim
13 words
Method according to claim 1, wherein the readjustment of the current proceeds continuously.
Claim 4
Dependent Claim
32 words
A method as defined in claim 1, wherein upon the occurrence of discharge disturbances as arcing the current is reduced to extinguish the disturbance and after the extinguishment the glow-discharge is continued.
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) | 1982-03-05 | 1982-09-04 | 1983-03-06 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1986-03-05 | 1986-09-04 | 1987-03-06 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1990-03-05 | 1990-09-04 | 1991-03-06 | $7700.00 | Window Closed / Lapsed |