US3267325A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Combined spark plugs and oscillatory circuit
Assignee: Motors Liquidation Co
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Filing: 1963-12-05
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Granted: 1966-08-16
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Expires: 1983-12-05
Abstract
No abstract record available.
Inventors
- 👤 Why John Frederick
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-29 10:59
CPC Classifications
H; H01; H01T; H01T13/00; H01T13/40; H01T13/41
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
139 words
A SPARK PLUG COMPRISING A METAL SHELL WHICH WHEN THE SPARK PLUG IS IN USE PROVIDES A CONNECTION TO EARTH, AN INSULATOR SECURED IN SAID METAL SHELL AND A CENTRE ELECTRODE ASSEMBLY SECURED IN A COAXIAL BORE IN SAID INSULATOR AND HAVING AT ONE END A VOLTAGE SUPPLY TERMINAL AND AT THE OTHER END A FIRING TIP ELECTRODE WHICH CO-OPERATES WITH AN EARTH ELECTRODE ON THE SHELL TO FORM AN IGNITION SPARK GAP THEREBETWEEN, AND INCLUDING ELEMENTS TO PROVIDE DURING USE OF THE PLUG AT LEAST ONE OSCILLATORY CIRCUIT, SAID ELEMENTS COMPRISING A FIRST CAPACITANCE CONNECTED BETWEEN THE VOLTAGE SUPPLY TERMINAL AND EARTH, A SECOND CAPACITANCE CONNECTED BETWEEN THE IGNITION SPARK GAP ELECTRODES, AND A SPARK GAP MEMBER AND AN INDUCTANCE CONNECTED IN SERIES INTERMEDIATE THE SIDES OF THE TWO CAPACITANCES WHICH ARE CONNECTED TO THE VOLTAGE SUPPLY TERMINAL.
Claim 2
Dependent Claim
139 words
A SPARK PLUG COMPRISING A METAL SHELL WHICH WHEN THE SPARK PLUG IS IN USE PROVIDES A CONNECTION TO EARTH, AN INSULATOR SECURED IN SAID METAL SHELL AND A CENTRE ELECTRODE ASSEMBLY SECURED IN A COAXIAL BORE IN SAID INSULATOR AND HAVING AT ONE END A VOLTAGE SUPPLY TERMINAL AND AT THE OTHER END A FIRING TIP ELECTRODE WHICH CO-OPERATES WITH AN EARTH ELECTRODE ON THE SHELL TO FORM AN IGNITION SPARK GAP THEREBETWEEN, AND INCLUDING ELEMENTS TO PROVIDE DURING USE OF THE PLUG AT LEAST ONE OSCILLATORY CIRCUIT, SAID ELEMENTS COMPRISING A FIRST CAPACITANCE CONNECTED BETWEEN THE VOLTAGE SUPPLY TERMINAL AND EARTH, A SECOND CAPACITANCE CONNECTED BETWEEN THE IGNITION SPARK GAP ELECTRODES, AND A SPARK GAP MEMBER AND AN INDUCTANCE CONNECTED IN SERIES INTERMEDIATE THE SIDES OF THE TWO CAPACITANCES WHICH ARE CONNECTED TO THE VOLTAGE SUPPLY TERMINAL.
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) | 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 |