US3701698A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Method for producing fissures in metallic surfaces of chromium
Assignee: CLARENCE W FORESTEK
•
Filing: 1971-01-04
•
Granted: 1972-10-31
•
Expires: 1991-01-04
Abstract
Abstract THE PROCESS DESCRIBED HEREIN INVOLVES A METHOD OF PRODUCING FISSURES IN A METAL SURFACE, SUCH AS CHROMIUM, BY THE CHEMICAL ACTION OF A SULFURIC ACID BATH IN WHICH ARE DISSOLVED A NUMBER OF METAL SALTS, CHROMIUM SULFATE, FERROUS SULFATE AND ALUMINUM SULFATE, WHICH RETARD THE ATTACK OF THE ACID ON THE SURFACE SO THAT CONTROLLED FISSURING IS EFFECTED TO PRODUCE THE DESIRED SIZE AND UNIFORMITY OF FISSURES. THESE FISSURES ARE SUITABLE FOR THE INTERFERENCE LOCKING OF PARTICLES OF POLYTETRAFLUOROETHYLENE OR OTHER FRICTION REDUCING MATERIAL.
Inventors
- 👤 Clarence W Forestek
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-03 20:32
CPC Classifications
C; C23; C23F; C23F1/00; C23F1/10; C23F1/14; C23F1/16; C23F1/26
Claims Analysis
Total Claims: 0
No claims parsed yet. Click Sync Now above to re-index claims from Google Patents.
References Cited (Backward Citations)
No citation records indexed.
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1975-10-31 | 1976-05-01 | 1976-10-31 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1979-10-31 | 1980-05-01 | 1980-10-31 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1983-10-31 | 1984-05-01 | 1984-10-31 | $7700.00 | Window Closed / Lapsed |