Patent US3952945A successfully refreshed from Google Patents.
US3952945A
Expired / Lapsed
US
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Furnace temperature control system
Assignee: US Borax Inc
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Filing: 1974-11-18
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Granted: 1976-04-27
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Expires: 1994-11-18
Abstract
Abstract Temperature control system for furnaces used in heat-treating metallic articles, such as boronizing steel.
Inventors
- 👤 Richard Hampton Biddulph
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-02 19:42
CPC Classifications
C; C21; C21D; C21D11/00; C23; C23C; C23C8/00; C23C8/60; C23C8/62; C23C8/68; C23C8/70; G; G05; G05D; G05D23/00; G05D23/19; G05D23/1902; G05D23/1904; G05D23/20; G05D23/22
Claims Analysis
Total Claims: 6
Claim 1
Independent Claim
132 words
A furnace heating and control system which comprises a furnace heating means; a first temperature controller, set to a temperature above the required treatment temperature, and connected to a first means for measuring the temperature of the furnace atmosphere, and to the heating means; a second temperature controller, set to a temperature below the required treatment temperature, and connected to a means for measuring the temperature of an article being treated and via a timing mechanism and a change-over relay, adapted to change control of the heating means from the first temperature controller to a third temperature controller, to the heating means; and a third temperature controller, set to the required treatment temperature, and connected to a second means, for measuring the temperature of the furnace atmosphere, and to the heating means.
Claim 2
Dependent Claim
132 words
A furnace heating and control system which comprises a furnace heating means; a first temperature controller, set to a temperature above the required treatment temperature, and connected to a first means for measuring the temperature of the furnace atmosphere, and to the heating means; a second temperature controller, set to a temperature below the required treatment temperature, and connected to a means for measuring the temperature of an article being treated and via a timing mechanism and a change-over relay, adapted to change control of the heating means from the first temperature controller to a third temperature controller, to the heating means; and a third temperature controller, set to the required treatment temperature, and connected to a second means, for measuring the temperature of the furnace atmosphere, and to the heating means.
Claim 3
Dependent Claim
30 words
A furnace heating and control system in accordance with claim 1, wherein the first temperature controller is set to a temperature just below the maximum operating temperature of the furnace.
Claim 4
Dependent Claim
39 words
A furnace heating and control system in accordance with claim 1 wherein the timing mechanism starts when the second temperature controller comes into operation and switches off all power to the heating means when a predetermined time has elapsed.
Claim 5
Dependent Claim
17 words
A furnace heating and control system in accordance with claim 1 wherein the temperature controllers are pyrometers.
Claim 6
Dependent Claim
19 words
A furnace heating and control system in accordance with claim 1 wherein the means for measuring temperature are thermocouples.
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) | 1979-04-27 | 1979-10-27 | 1980-04-27 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1983-04-27 | 1983-10-27 | 1984-04-27 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1987-04-27 | 1987-10-27 | 1988-04-27 | $7700.00 | Window Closed / Lapsed |