US3400302A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Electric igniter system for fuel burners and the like
Assignee: Robertshaw US Holding Corp
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Filing: 1966-04-01
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Granted: 1968-09-03
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Expires: 1986-04-01
Abstract
No abstract record available.
Inventors
- 👤 Marsden L Miller
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-27 18:59
CPC Classifications
F; F23; F23Q; F23Q3/00; F23Q3/004
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
148 words
AN IGNITER SYSTTEM COMPRISING A TRANSFORMER INCLUDING A PRIMARY WINDING AND A SECONDARY WINDING, SPARK GAP IGNITER MEANS CONNECTED IN CIRCUIT WITH SAID SECONDARY WINDING, A SOURCE OF ELECTRIC CURRENT INCLUDING TWO CONDUCTORS CONNECTED TO OPPOSITE SIDES OF SAID SOURCE, ONE TERMINAL OF SAID PRIMARY WINDING CONNECTED TO ONE OF SAID CONDUCTORS, CIRCUIT MEANS CONNECTING THE OTHER TERMINAL OF SAID PRIMARY TRANSFORMER WINDING TO THE OTHER OF SAID CONDUCTORS AND INCLUDING SEMICONDUCTOR SWITCH MEANS IN SERIES WITH SAID PRIMARY WINDING AND REPONSIVE TO A SURGE OF CURRENT TO RENDER THE CIRCUIT FOR SAID PRIMARY WINDING CONDUCTIVE, A CAPACITOR CONNECTED IN PARALLEL WITH SAID PRIMARY WINDING AND DISCHARGING THROUGH SAID PRIMARY WHEN SAID SWITCH MEANS CONDUCTS, AND MEANS TO PERIODICALLY RENDER SAID SWITCH MEANS CONDUCTIVE INCLUDING AN RC NETWORK COMPRISING A SECOND CAPACITOR CONNECTED IN PARALLEL WITH SAID PRIMARY WINDING AND TO A CONTROL ELECTRODE OF SAID SWITCH MEANS.
Claim 2
Dependent Claim
148 words
AN IGNITER SYSTTEM COMPRISING A TRANSFORMER INCLUDING A PRIMARY WINDING AND A SECONDARY WINDING, SPARK GAP IGNITER MEANS CONNECTED IN CIRCUIT WITH SAID SECONDARY WINDING, A SOURCE OF ELECTRIC CURRENT INCLUDING TWO CONDUCTORS CONNECTED TO OPPOSITE SIDES OF SAID SOURCE, ONE TERMINAL OF SAID PRIMARY WINDING CONNECTED TO ONE OF SAID CONDUCTORS, CIRCUIT MEANS CONNECTING THE OTHER TERMINAL OF SAID PRIMARY TRANSFORMER WINDING TO THE OTHER OF SAID CONDUCTORS AND INCLUDING SEMICONDUCTOR SWITCH MEANS IN SERIES WITH SAID PRIMARY WINDING AND REPONSIVE TO A SURGE OF CURRENT TO RENDER THE CIRCUIT FOR SAID PRIMARY WINDING CONDUCTIVE, A CAPACITOR CONNECTED IN PARALLEL WITH SAID PRIMARY WINDING AND DISCHARGING THROUGH SAID PRIMARY WHEN SAID SWITCH MEANS CONDUCTS, AND MEANS TO PERIODICALLY RENDER SAID SWITCH MEANS CONDUCTIVE INCLUDING AN RC NETWORK COMPRISING A SECOND CAPACITOR CONNECTED IN PARALLEL WITH SAID PRIMARY WINDING AND TO A CONTROL ELECTRODE OF SAID SWITCH 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) | 1971-09-03 | 1972-03-04 | 1972-09-03 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1975-09-03 | 1976-03-04 | 1976-09-03 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1979-09-03 | 1980-03-04 | 1980-09-03 | $7700.00 | Window Closed / Lapsed |