Patent US3247887A successfully refreshed from Google Patents.
US3247887A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Spark ignition system
Assignee: Penn Controls Inc
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Filing: 1962-09-04
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Granted: 1966-04-26
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Expires: 1982-09-04
Abstract
No abstract record available.
Inventors
- 👤 Russell B Matthews
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 17:57
CPC Classifications
F; F23; F23Q; F23Q3/00; F23Q3/004
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
83 words
A SPARK IGNITION SYSTEM FOR IGNITING FUEL COMPRISING: MEANS FORMING A SERIES RESONANT CIRCUIT INCLUDING MEANS FOR ENERGIZING A SPARK GAP TO PRODUCE A SPARK FOR IGNITING SAID FUEL WHEN SAID CIRCUIT IS CONNECTED ACROSS AN ALTERNATING CURRENT SOURCE, AND HEAT RESPONSIVE MEANS OPERATIVELY RESPONSIVE TO COMBUSTION OF SAID FUEL AND CONNECTED TO SAID CIRCUIT FOR DETUNING SAID CIRCUIT TO EXTINGUISH SAID SPARK WHEN HEATED BY SAID FUEL COMBUSTION TO A CERTAIN LEVEL WHILE MAINTAINING SAID CIRCUIT ENERGIZED BY SAID ALTERNATING CURRENT SOURCE.
Claim 2
Dependent Claim
83 words
A SPARK IGNITION SYSTEM FOR IGNITING FUEL COMPRISING: MEANS FORMING A SERIES RESONANT CIRCUIT INCLUDING MEANS FOR ENERGIZING A SPARK GAP TO PRODUCE A SPARK FOR IGNITING SAID FUEL WHEN SAID CIRCUIT IS CONNECTED ACROSS AN ALTERNATING CURRENT SOURCE, AND HEAT RESPONSIVE MEANS OPERATIVELY RESPONSIVE TO COMBUSTION OF SAID FUEL AND CONNECTED TO SAID CIRCUIT FOR DETUNING SAID CIRCUIT TO EXTINGUISH SAID SPARK WHEN HEATED BY SAID FUEL COMBUSTION TO A CERTAIN LEVEL WHILE MAINTAINING SAID CIRCUIT ENERGIZED BY SAID ALTERNATING CURRENT SOURCE.
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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) | 1969-04-25 | 1969-10-25 | 1970-04-26 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1973-04-25 | 1973-10-25 | 1974-04-26 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1977-04-25 | 1977-10-25 | 1978-04-26 | $7700.00 | Window Closed / Lapsed |