US3266725A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Systems for controlling furnace temperatures without overshoot
Assignee: Leeds and Northrup Co
•
Filing: 1963-03-25
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Granted: 1966-08-16
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Expires: 1983-03-25
Abstract
No abstract record available.
Inventors
- 👤 James L Garrison
- 👤 Jr William R Haden
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-31 14:07
CPC Classifications
G; G05; G05D; G05D23/00; G05D23/19; G05D23/20; G05D23/22; G05D23/1927; G05D23/193; G05D23/1931
Claims Analysis
Total Claims: 1
Claim 1
Independent Claim
98 words
A CONTROL SYSTEM FOR REGULATING THE HEAT INPUT TO A FURNACE DURING A PERIOD IN WHICH THE WORK THEREIN IS BEING ELEVATED TO A SET-POINT TEMPERATURE, COMPRISING MEANS FOR PRODUCING A FIRST SIGNAL RELATED TO THE DEVIATION OF THE TEMPERATURE OF THE WORK FROM SAID SETPOINT AND RESPRESENTATIVE OF THE DESIRED HEAT-HEAD IN SAID FURNACE, MEANS FOR PRODUCING A SECOND SIGNAL CORRESPONDING TO THE DEVIATION OF THE TEMPERATURE OF THE HIGH TEMPERATURE AREA OF THE FURNACE FROM THE SAID WORK TEMPERATURE SET-POINT, AND MEANS FOR CONTROLLING SAID HEAT INPUT TO MAINTAIN SAID FIRST AND SECOND SIGNALS IN EQUALITY.
References Cited (Backward Citations)
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USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1969-08-15 | 1970-02-14 | 1970-08-16 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1973-08-15 | 1974-02-14 | 1974-08-16 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1977-08-15 | 1978-02-14 | 1978-08-16 | $7700.00 | Window Closed / Lapsed |