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US2819681A
Expired / Lapsed
US
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Treatment of metal surfaces to increase the coefficient of friction
Assignee: ChampionX LLC
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Filing: 1955-11-02
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Granted: 1958-01-14
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Expires: 1975-11-02
Abstract
No abstract record available.
Inventors
- 👤 George W Luvisi
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-28 14:29
CPC Classifications
B; B61; B61C; B61C15/00; B61C15/08; B61C15/085; F; F16; F16D; F16D69/00; F16D69/02; F16D69/027
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
63 words
THE METHOD OF IMPROVING THE FRICTIONAL CONTACT BETWEEN TWO METAL SURFACES CAPABLE OF MOTION ONE WITH RESPECT TO THE OTHER WHICH COMPRISES APPLYING TO AT LEAST ONE OF SAID SURFACE A FINE SILICIA IN POWDER FORM HAVING A SPECIFIC SURFACE AREA OF AT LEAST 20 SQUARE METERS PER GRAM, AND BRINGING SAID SURFACES INTO CONTACT WITH ONE ANOTHER WITH SAID FINE SILICA THEREBETWEEN.
Claim 2
Independent Claim
63 words
THE METHOD OF IMPROVING THE FRICTIONAL CONTACT BETWEEN TWO METAL SURFACES CAPABLE OF MOTION ONE WITH RESPECT TO THE OTHER WHICH COMPRISES APPLYING TO AT LEAST ONE OF SAID SURFACE A FINE SILICIA IN POWDER FORM HAVING A SPECIFIC SURFACE AREA OF AT LEAST 20 SQUARE METERS PER GRAM, AND BRINGING SAID SURFACES INTO CONTACT WITH ONE ANOTHER WITH SAID FINE SILICA THEREBETWEEN.
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) | 1961-01-13 | 1961-07-15 | 1962-01-14 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1965-01-13 | 1965-07-15 | 1966-01-14 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1969-01-13 | 1969-07-15 | 1970-01-14 | $7700.00 | Window Closed / Lapsed |