Patent US2660544A successfully refreshed from Google Patents.
US2660544A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Cleaning spark plugs
Assignee: Sinclair Refining Co
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Filing: 1951-09-22
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Granted: 1953-11-24
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Expires: 1971-09-22
Abstract
No abstract record available.
Inventors
- 👤 Robert J Rieckhoff
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-30 16:23
CPC Classifications
C; C23; C23G; C23G1/00; C23G1/24; C23G3/00; H; H01; H01T; H01T13/00; H01T13/02; H01T13/14
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
63 words
A PROCESS FOR CLEANING ENGINE SPARK PLUGS TO REMOVE DEPOSITS CONSISTING ESSENTIALLY OF LEAD OXIDE, LEAD OXYBROMIDE, AND LEAD BROMIDE WHICH COMPRISES REMOVING GREASE AND OIL FROM THE ELECTRODE SURFACES OF THE PLUG, THEREAFTER SUBJECTING THE ELECTRODE SURFACES OF THE PLUG TO THE SOLVENT ACTION OF A HOT AQUEOUS SOLUTION OF AMMONIUM CITRATE, WASHING THE CLEANED PLUGS WITH WATER, AND DRYING THE PLUGS.
Claim 2
Dependent Claim
63 words
A PROCESS FOR CLEANING ENGINE SPARK PLUGS TO REMOVE DEPOSITS CONSISTING ESSENTIALLY OF LEAD OXIDE, LEAD OXYBROMIDE, AND LEAD BROMIDE WHICH COMPRISES REMOVING GREASE AND OIL FROM THE ELECTRODE SURFACES OF THE PLUG, THEREAFTER SUBJECTING THE ELECTRODE SURFACES OF THE PLUG TO THE SOLVENT ACTION OF A HOT AQUEOUS SOLUTION OF AMMONIUM CITRATE, WASHING THE CLEANED PLUGS WITH WATER, AND DRYING THE PLUGS.
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) | 1956-11-23 | 1957-05-25 | 1957-11-24 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1960-11-23 | 1961-05-25 | 1961-11-24 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1964-11-23 | 1965-05-25 | 1965-11-24 | $7700.00 | Window Closed / Lapsed |