US3203774A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Method of making an abrasive cut-off disk
Assignee: Vanguard Abrasive Corp
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Filing: 1961-12-01
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Granted: 1965-08-31
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Expires: 1981-12-01
Abstract
No abstract record available.
Inventors
- 👤 Willard R Pratt
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 13:45
CPC Classifications
B; B28; B28D; B28D1/00; B28D1/02; B28D1/12; B28D1/121; B24; B24D; B24D18/00; B24D5/00; B24D5/12; B24D5/123; B24D5/14
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
173 words
THE METHOD OF MAKING AN ABRASIVE ELEMENT HAVING GREATER WEAR RESISTANCE AT ITS LATERAL EDGES THAN IN ITS CENTRAL PORTION, WHICH COMPRISES THE STEPS OF MIXING A FIRST BATCH OF POWDERED MATRIX METAL WITH A SUFFICIENT QUANTITY OF DIAMOND PARTICLES TO PROVIDE A RELATIVELY HIGH CONCENTRATION OF DIAMOND PARTICLES IN THE MIXTURE OF THE FIRST BATCH, MIXING A SECOND BATCH OF POWDERED MATRIX METAL WITH A RELATIVELY LESSER QUANTITY OF DIAMOND PARTICLES TO PROVIDE A SUBSTANTIALLY LESSER CONCENTRATION OF DIAMOND PARTICLES IN THE MIXTURE OF THE SECOND BATCH, PLACING A LAYER OF THE MIXTURE OF THE SECOND BATCH BETWEEN TWO LAYERS OF THE MIXTURE OF THE FIRST BATCH IN SANDWICH FASHION, AND COMPACTING THE THREE LAYERS UNDER HEAT ACCOMPANIED BY PRESSURE APPLIED APPROXIMATELY PERPENDICULAR TO THE LINES SEPARATING THE LAYERS FROM EACH OTHER, TO FORM FROM THE THREE LAYERS AN INTEGRALLY UNITED ABRASIVE ELEMENT HAVING A LOWER CONCENTRATION OF DIAMOND PARTICLES AND LOWER WEAR RESISTANCE IN ITS CENTRAL LAYER AS COMPARED WITH THE DIAMOND PARTICLE CONCENTRATION AND WEAR RESISTANCE OF ITS OUTER LAYERS.
Claim 2
Independent Claim
173 words
THE METHOD OF MAKING AN ABRASIVE ELEMENT HAVING GREATER WEAR RESISTANCE AT ITS LATERAL EDGES THAN IN ITS CENTRAL PORTION, WHICH COMPRISES THE STEPS OF MIXING A FIRST BATCH OF POWDERED MATRIX METAL WITH A SUFFICIENT QUANTITY OF DIAMOND PARTICLES TO PROVIDE A RELATIVELY HIGH CONCENTRATION OF DIAMOND PARTICLES IN THE MIXTURE OF THE FIRST BATCH, MIXING A SECOND BATCH OF POWDERED MATRIX METAL WITH A RELATIVELY LESSER QUANTITY OF DIAMOND PARTICLES TO PROVIDE A SUBSTANTIALLY LESSER CONCENTRATION OF DIAMOND PARTICLES IN THE MIXTURE OF THE SECOND BATCH, PLACING A LAYER OF THE MIXTURE OF THE SECOND BATCH BETWEEN TWO LAYERS OF THE MIXTURE OF THE FIRST BATCH IN SANDWICH FASHION, AND COMPACTING THE THREE LAYERS UNDER HEAT ACCOMPANIED BY PRESSURE APPLIED APPROXIMATELY PERPENDICULAR TO THE LINES SEPARATING THE LAYERS FROM EACH OTHER, TO FORM FROM THE THREE LAYERS AN INTEGRALLY UNITED ABRASIVE ELEMENT HAVING A LOWER CONCENTRATION OF DIAMOND PARTICLES AND LOWER WEAR RESISTANCE IN ITS CENTRAL LAYER AS COMPARED WITH THE DIAMOND PARTICLE CONCENTRATION AND WEAR RESISTANCE OF ITS OUTER LAYERS.
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) | 1968-08-30 | 1969-03-01 | 1969-08-31 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1972-08-30 | 1973-03-01 | 1973-08-31 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1976-08-30 | 1977-03-01 | 1977-08-31 | $7700.00 | Window Closed / Lapsed |