Patent US3913281A successfully refreshed from Google Patents.
US3913281A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Ball grinding ceramic wheel containing manganese dioxide
Assignee: Saint Gobain Abrasives Inc
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Filing: 1974-01-15
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Granted: 1975-10-21
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Expires: 1994-01-15
Abstract
Abstract Mixtures of abrasive grains and bond compositions within a given range are shown for making ceramic grinding wheels containing predominantly alumina abrasive grits in a fired clay bond having filler and fluxing additives adapted to produce a predominantly crystalline ceramic bond for finish grinding spherical steel balls for bearings, wherein the mesh size and quantity of the abrasive grits and the relative proportions of the clay bonding ingredients including crystalline fillers and fluxing agents, and degree of pressure and conditions of the firing cycle can be varied to predictably modify the grinding characteristics of the resultant fired ceramic wheels in terms of a harder or softer grinding wheel action.
Inventors
- 👤 Cecil M Jones
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-07 13:36
CPC Classifications
B; B24; B24D; B24D3/00; B24D3/02; B24D3/04; B24D3/14; B24D3/16
Claims Analysis
Total Claims: 3
Claim 1
Independent Claim
185 words
A HARD DENSE CRERAMIC WHEEL FOR THE GRINDING OF SPHERES FOR BALL BEARINGS, THE WHEEL HAVING A COMPOSITION COMPRISING A CLAY COMPONENT IN THE CERAMIC BOND IN THE RANGE OF 10% TO 30% BY WEIGHT OF THE DRY MIX FROM WHICH THE WHEEL IS MADE, A CRYSTALLINE ALPHA ALUMINUM FILTER PRESENT IN SAID BOND IN AN AMOUNT OF AT LEAST 15% BY WEIGHT OF THE DRY MIX, PARTICLES OF SAID FILLER BEING LESS THAN ABOUT 44 MICRONS MAXIMUM SIZE IN THEIR LONGEST DIMENSION, ABRASIVE GRITS IN SAID BOND BEING COARSER THAN SAID FILLER AND IN SIZE RANGE OF 80-GRIT SIZE AND FINER BASED ON THE U.S. STANDARD SCREENS, SAID ABRASIVE GRITS BEING SELECTED FROM THE GROUP CONSISTING OF A12O3, SIC AND MIXTURES THEREOF, SAID GRITS BEING PRESENT IN A RANGE OF FROM 10 TO 50% BY WEIGHT OF THE DRY MIX, AND SAID BOND AND ABRASIVE MIX INCLUDING AT LEAST 5 TO 9% BY WEIGHT OF MANGANESE OXIDE, SAID WHEEL HAVING A MOLDULUS OF ELASTICITY OF FROM 110 X 10**10 DYNES/CM2 TO 180 X 10**10 DYNES/CM2, AND A DENSITY OF FROM 2.8 TO 3.25 GRAMS/CM.
Claim 2
Dependent Claim
185 words
A HARD DENSE CRERAMIC WHEEL FOR THE GRINDING OF SPHERES FOR BALL BEARINGS, THE WHEEL HAVING A COMPOSITION COMPRISING A CLAY COMPONENT IN THE CERAMIC BOND IN THE RANGE OF 10% TO 30% BY WEIGHT OF THE DRY MIX FROM WHICH THE WHEEL IS MADE, A CRYSTALLINE ALPHA ALUMINUM FILTER PRESENT IN SAID BOND IN AN AMOUNT OF AT LEAST 15% BY WEIGHT OF THE DRY MIX, PARTICLES OF SAID FILLER BEING LESS THAN ABOUT 44 MICRONS MAXIMUM SIZE IN THEIR LONGEST DIMENSION, ABRASIVE GRITS IN SAID BOND BEING COARSER THAN SAID FILLER AND IN SIZE RANGE OF 80-GRIT SIZE AND FINER BASED ON THE U.S. STANDARD SCREENS, SAID ABRASIVE GRITS BEING SELECTED FROM THE GROUP CONSISTING OF A12O3, SIC AND MIXTURES THEREOF, SAID GRITS BEING PRESENT IN A RANGE OF FROM 10 TO 50% BY WEIGHT OF THE DRY MIX, AND SAID BOND AND ABRASIVE MIX INCLUDING AT LEAST 5 TO 9% BY WEIGHT OF MANGANESE OXIDE, SAID WHEEL HAVING A MOLDULUS OF ELASTICITY OF FROM 110 X 10**10 DYNES/CM2 TO 180 X 10**10 DYNES/CM2, AND A DENSITY OF FROM 2.8 TO 3.25 GRAMS/CM.
Claim 3
Dependent Claim
26 words
A wheel in accordance with claim 1 wherein said alpha alumina filler is selected from the group consisting of alumina dust collector fines and Bayer alumina.
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) | 1978-10-20 | 1979-04-21 | 1979-10-21 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1982-10-20 | 1983-04-21 | 1983-10-21 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1986-10-20 | 1987-04-21 | 1987-10-21 | $7700.00 | Window Closed / Lapsed |