Patent US3239970A successfully refreshed from Google Patents.
US3239970A
Expired / Lapsed
US
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Method of removing surface irregularities from metal articles
Assignee: Unifrax I LLC
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Filing: 1962-08-06
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Granted: 1966-03-15
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Expires: 1982-08-06
Abstract
No abstract record available.
Inventors
- 👤 George W Bishop
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-27 05:51
CPC Classifications
B; B24; B24B; B24B31/00; B24B31/12; B24B31/14; B02; B02C; B02C17/00; B02C17/18; B02C17/20
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
25 words
A METHOD OF REMOVING SURFACE IRREGULARITIES FROM METAL ARTICLES BY ABRASION WHICH COMPRISES TUMBLING SAID ARTICLES WITH A MEDIA CONSISTING ESSENTIALLY OF SINTERED MICROCRYSTALINE BAUXITE.
Claim 2
Independent Claim
25 words
A METHOD OF REMOVING SURFACE IRREGULARITIES FROM METAL ARTICLES BY ABRASION WHICH COMPRISES TUMBLING SAID ARTICLES WITH A MEDIA CONSISTING ESSENTIALLY OF SINTERED MICROCRYSTALINE BAUXITE.
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) | 1969-03-14 | 1969-09-13 | 1970-03-15 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1973-03-14 | 1973-09-13 | 1974-03-15 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1977-03-14 | 1977-09-13 | 1978-03-15 | $7700.00 | Window Closed / Lapsed |