Patent US2821610A successfully refreshed from Google Patents.
Patent US3029160A successfully refreshed from Google Patents.
US3029160A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Manufacture of abrasive coated products
Assignee: Unifrax I LLC
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Filing: 1957-10-21
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Granted: 1962-04-10
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Expires: 1977-10-21
Abstract
No abstract record available.
Inventors
- 👤 Roland R Van Der Beck Jr
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-01 11:57
CPC Classifications
B; B24; B24D; B24D11/00; B24D11/001; B24D11/005
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
80 words
AS A NEW ARTICLE OF MANUFACTURE, A FREE-FLOWING MASS OF DISCRETE, MOBILE, ABRASIVE GRAIN HAVING IMPROVED PROJECTABILITY CHARACTERISTICS IN AN ELECTROSTATIC FIELD, EACH SAID GRAIN HAVING ON ITS SURFACE A SUBSTANTIALLY UNIFORM DRIED DEPOSIT COMPRISING A SMALL AMOUNT UP TO ABOUT 5% BY WEIGHT OF SAID ABRASIVE GRAIN, DRY BASIS, OF DISCRETE, COLLOIDAL SIZE PARTICLES OF ELECTRICALLY NON-CONDUCTIVE MA TERIAL SELECTED FROM THE GROUP CONSISTING OF SILICA AND ZIRCONIA, SAID PARTICLES HAVING AN AVERAGE SIZE NOT EXCEEDING ABOUT 130 MILLIMICRONS.
Claim 2
Dependent Claim
80 words
AS A NEW ARTICLE OF MANUFACTURE, A FREE-FLOWING MASS OF DISCRETE, MOBILE, ABRASIVE GRAIN HAVING IMPROVED PROJECTABILITY CHARACTERISTICS IN AN ELECTROSTATIC FIELD, EACH SAID GRAIN HAVING ON ITS SURFACE A SUBSTANTIALLY UNIFORM DRIED DEPOSIT COMPRISING A SMALL AMOUNT UP TO ABOUT 5% BY WEIGHT OF SAID ABRASIVE GRAIN, DRY BASIS, OF DISCRETE, COLLOIDAL SIZE PARTICLES OF ELECTRICALLY NON-CONDUCTIVE MA TERIAL SELECTED FROM THE GROUP CONSISTING OF SILICA AND ZIRCONIA, SAID PARTICLES HAVING AN AVERAGE SIZE NOT EXCEEDING ABOUT 130 MILLIMICRONS.
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USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1965-04-09 | 1965-10-09 | 1966-04-10 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1969-04-09 | 1969-10-09 | 1970-04-10 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1973-04-09 | 1973-10-09 | 1974-04-10 | $7700.00 | Window Closed / Lapsed |