Patent US3963459A successfully refreshed from Google Patents.
US3963459A
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Blow molding process for manufacturing grinding wheels
Assignee: Saint Gobain Abrasives Inc
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Filing: 1973-10-03
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Granted: 1976-06-15
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Expires: 1993-10-03
Abstract
Abstract A composition for filling a mold with abrasive grits and bond making use of resin bond particles and abrasive grains of approximately the same size intimately mixed together for use in a blow molding procedure.
Inventors
- 👤 Daniel Robert Vinard
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-30 15:46
CPC Classifications
B; B24; B24D; B24D18/00; C; C09; C09K; C09K3/00; C09K3/14; C09K3/1409
Claims Analysis
Total Claims: 4
Claim 1
Independent Claim
160 words
A method for manufacturing grinding wheels characterized in that a granulated mixture containing at least abrasive grains and bond grains within a hopper is introduced into a cavity of a closed mold by blowing with a compressed gas, said mixture having a relatively uniform distribution of grain sizes proportioned within a formula where D is the mean diameter of the grains in the mixture, at least 90% of the grains have a diameter between 0.5 D and 2D, 2% at most have a diameter less than 0.1 D and the remainder a diameter falling in a range between 0.1 D and 0.5 D whereby a homogeneous mass is obtained when said mixture is poured into the hopper and is blown into the cavity of the mold, then compressing and reducing the volume of said mixture in the cavity of the mold to form a grinding wheel of the desired size, and heating the grinding wheel sufficiently to cure the bond.
Claim 2
Independent Claim
160 words
A method for manufacturing grinding wheels characterized in that a granulated mixture containing at least abrasive grains and bond grains within a hopper is introduced into a cavity of a closed mold by blowing with a compressed gas, said mixture having a relatively uniform distribution of grain sizes proportioned within a formula where D is the mean diameter of the grains in the mixture, at least 90% of the grains have a diameter between 0.5 D and 2D, 2% at most have a diameter less than 0.1 D and the remainder a diameter falling in a range between 0.1 D and 0.5 D whereby a homogeneous mass is obtained when said mixture is poured into the hopper and is blown into the cavity of the mold, then compressing and reducing the volume of said mixture in the cavity of the mold to form a grinding wheel of the desired size, and heating the grinding wheel sufficiently to cure the bond.
Claim 3
Dependent Claim
22 words
A method according to claim 1, characterized in that it is applied to the manufacture of organic resin and vitrified grinding wheels.
Claim 4
Dependent Claim
23 words
A method according to claim 2, characterized in that blowing is carried out through the bore in the center of the grinding wheel.
References Cited (Backward Citations)
US2611938A
Cited
US2860961A
Cited
US2862806A
Cited
US3377411A
Cited
US3573013A
Cited
US3615302A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1979-06-15 | 1979-12-15 | 1980-06-15 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1983-06-15 | 1983-12-15 | 1984-06-15 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1987-06-15 | 1987-12-15 | 1988-06-15 | $7700.00 | Window Closed / Lapsed |