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Patent US3138194A successfully refreshed from Google Patents.
US3138194A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Multiple burner heating system
Assignee: Robertshaw Controls Co
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Filing: 1962-02-09
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Granted: 1964-06-23
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Expires: 1982-02-09
Abstract
No abstract record available.
Inventors
- 👤 Wilbur F Jackson
- 👤 John W Wright
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-31 21:01
CPC Classifications
F; F23; F23D; F23D14/00; F23D14/02
Claims Analysis
Total Claims: 1
Claim 1
Independent Claim
127 words
IN A HEATING SYSTEM; A SERIES OF BURNERS CONNECTED TO A SOURCE OF FUEL, A THERMALLY RESPONSIVE VALVE FOR EACH BURNER FOR CONTROLLING FUEL FLOW TO THE BURNER, A TEMPERATURE SENSING ELEMENT FOR EACH OF SAID VALVES OPERATIVE WHEN HEATED TO ACTUATE THE VALVE TO SUPPLY FUEL TO THE BURNER AND OPERATIVE WHEN COOLED TO ACTUATE THE VALVE TO SHUT OFF FUEL FLOW TO THE BURNER, AND A THERMOSTATICALLY RESPONSIVE IGNITION PILOT OPERATIVE IN RESPONSE TO TEMPERATURE DEMAND TO ACTUATE THE THERMALLY RESPONSIVE VALVE OF THE FIRST BURNER OF SAID SERIES, THE THERMALLY RESPONSIVE VALVE OF EACH OF THE SUCCEEDING BURNERS IN THE SERIES BEING OPERATIVE IN RESPONSE TO IGNITION OF ITS PRECEDING BURNER TO SUPPLY FUEL TO ITS BURNER TO BE IGNITED BY SAID PRECEDING BURNER.
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) | 1967-06-23 | 1967-12-23 | 1968-06-23 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1971-06-23 | 1971-12-23 | 1972-06-23 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1975-06-23 | 1975-12-23 | 1976-06-23 | $7700.00 | Window Closed / Lapsed |