US2787967A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Method of improving the coefficient of friction between contacting metal surfaces and article produced thereby
Assignee: ChampionX LLC
•
Filing: 1955-05-06
•
Granted: 1957-04-09
•
Expires: 1975-05-06
Abstract
No abstract record available.
Inventors
- 👤 Thomas C Nohejl
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-05 21:11
CPC Classifications
C; C09; C09K; C09K3/00; C09K3/14; C09K3/149
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
59 words
A STRUCTURE HAVING TWO METAL SURFACES CAPABLE OF MOTION ONE WITH RESPECT TO THE OTHER AND ADAPTED TO ENGAGE EACH OTHER BY FRICTIONAL CONTACT, AT LEAST ONE OF SAID SURFACES BEING COATED WITH A THIN COATING OF A FINE SILICA HAVING A SPECIFIC SURFACE AREA OF AT LEAST 25 SQUARE METERS PER GRAM DISPERSED IN A NON-LUBRICATING HYDROPHILIC LIQUID.
Claim 2
Dependent Claim
59 words
A STRUCTURE HAVING TWO METAL SURFACES CAPABLE OF MOTION ONE WITH RESPECT TO THE OTHER AND ADAPTED TO ENGAGE EACH OTHER BY FRICTIONAL CONTACT, AT LEAST ONE OF SAID SURFACES BEING COATED WITH A THIN COATING OF A FINE SILICA HAVING A SPECIFIC SURFACE AREA OF AT LEAST 25 SQUARE METERS PER GRAM DISPERSED IN A NON-LUBRICATING HYDROPHILIC LIQUID.
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) | 1960-04-08 | 1960-10-08 | 1961-04-09 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1964-04-08 | 1964-10-08 | 1965-04-09 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1968-04-08 | 1968-10-08 | 1969-04-09 | $7700.00 | Window Closed / Lapsed |