Patent US3599030A successfully refreshed from Google Patents.
US3599030A
Expired / Lapsed
US
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Annular surface gap spark plug
Assignee: Brunswick Corp
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Filing: 1969-07-15
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Granted: 1971-08-10
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Expires: 1989-07-15
Abstract
Abstract A tungsten alloy center electrode is employed in a spark plug of the annular surface gap-type for use with a high tension ignition system.
Inventors
- 👤 Daniel A Armstrong
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-03 18:55
CPC Classifications
H; H01; H01T; H01T13/00; H01T13/20; H01T13/39
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
98 words
An annular gap spark plug for a two-cycle engine having capacitor discharge fast-rise time ignition system with a sufficiently high voltage capacity to fire across a gap exceeding 0.03 inch, said spark plug being constructed to operate at temperatures below 1000* F. and having a refractory body with a central electrode of tungsten alloy confined therein and a circular casing constituting an electrode substantially concentric with the central electrode and providing a circular gap between said electrodes of substantially uniform dimension exceeding 0.03 inch, said central electrode being substantially free of deterioration at temperatures below approximately 1000* F.
Claim 2
Dependent Claim
98 words
An annular gap spark plug for a two-cycle engine having capacitor discharge fast-rise time ignition system with a sufficiently high voltage capacity to fire across a gap exceeding 0.03 inch, said spark plug being constructed to operate at temperatures below 1000* F. and having a refractory body with a central electrode of tungsten alloy confined therein and a circular casing constituting an electrode substantially concentric with the central electrode and providing a circular gap between said electrodes of substantially uniform dimension exceeding 0.03 inch, said central electrode being substantially free of deterioration at temperatures below approximately 1000* F.
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) | 1974-08-09 | 1975-02-08 | 1975-08-10 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1978-08-09 | 1979-02-08 | 1979-08-10 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1982-08-09 | 1983-02-08 | 1983-08-10 | $7700.00 | Window Closed / Lapsed |