Patent US2655775A successfully refreshed from Google Patents.
US2655775A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Lapping method and tool
Assignee: EIDP Inc
•
Filing: 1950-05-22
•
Granted: 1953-10-20
•
Expires: 1970-05-22
Abstract
No abstract record available.
Inventors
- 👤 Thomas G Lewis
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-27 13:27
CPC Classifications
B; B24; B24D; B24D15/00; B24D15/02
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
76 words
THE METHOD OF LAPPING A METAL ARTICLE COMPRISING APPLYING TO SAID ARTICLE A PARTICULATE ABRASIVE SUSPENDED IN AN OIL VEHICLE, FORCING SAID ABRASIVE AGAINST SAID ARTICLE WITH A MATERIAL HAVING A ROCKWELL C HARDNESS OF 60 OR HIGHER AT PRESSURE BELOW ABOUT 18 LBS./SQ. IN. WHILE MAINTAINING RELATIVE RANDOM MOVEMENT BETWEEN SAID ARTICLE AND SAID MATERIAL, AND PROGRESSIVELY DECREASING THE SIZE OF SAID SUSPENDED ABRASIVE FROM COARSE TO FINE AS THE SURFACE FINISH OF SAID ARTICLE
Claim 2
Independent Claim
76 words
THE METHOD OF LAPPING A METAL ARTICLE COMPRISING APPLYING TO SAID ARTICLE A PARTICULATE ABRASIVE SUSPENDED IN AN OIL VEHICLE, FORCING SAID ABRASIVE AGAINST SAID ARTICLE WITH A MATERIAL HAVING A ROCKWELL C HARDNESS OF 60 OR HIGHER AT PRESSURE BELOW ABOUT 18 LBS./SQ. IN. WHILE MAINTAINING RELATIVE RANDOM MOVEMENT BETWEEN SAID ARTICLE AND SAID MATERIAL, AND PROGRESSIVELY DECREASING THE SIZE OF SAID SUSPENDED ABRASIVE FROM COARSE TO FINE AS THE SURFACE FINISH OF SAID ARTICLE
References Cited (Backward Citations)
US257612A
Cited
US336582A
Cited
US1318300A
Cited
USRE22770E
Cited
US1343522A
Cited
US1356330A
Cited
US1682420A
Cited
US1979689A
Cited
US2230654A
Cited
US2353171A
Cited
US2412306A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1956-10-19 | 1957-04-20 | 1957-10-20 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1960-10-19 | 1961-04-20 | 1961-10-20 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1964-10-19 | 1965-04-20 | 1965-10-20 | $7700.00 | Window Closed / Lapsed |