Patent US3950149A successfully refreshed from Google Patents.
US3950149A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Method for continuously producing resinoid wheels
Assignee: Individual
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Filing: 1974-05-16
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Granted: 1976-04-13
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Expires: 1994-05-16
Abstract
Abstract An abrasive composition prepared by kneading abrasive grains and a binder together, with addition of a filler when desired, is molded into a block, which is heated by a high-frequency wave heater and then passed between multiple pairs of rolls and thereby rolled into a sheet. Circular pieces are blanked out from the rolled sheet and subsequently baked to continuously produce resinoid wheels.
Inventors
- 👤 Heijiro Fukuda
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-27 08:18
CPC Classifications
B; B24; B24D; B24D18/00; C; C09; C09K; C09K3/00; C09K3/14
Claims Analysis
Total Claims: 6
Claim 1
Independent Claim
204 words
A method for producing a resin-bonded abrasive wheel comprising the steps of: a. kneading abrasive grains having a mesh size in the range of about 16 to 220 mesh, and an uncured thermosetting synthetic resin binder therefor, in the proportion of about 60 to 90 parts by weight of abrasive grains to about 10 to 90 parts by weight of said binder, to form an abrasive composition suitable for molding; b. molding said abrasive composition at a temperature from about 70° to about 90° C and at a pressure from about 80 to about 140 kg/cm 2 for about 20 to 60 seconds, to form a molded block having a thickness of 25 to 40 mm.; c. heating said molded block by high frequency wave energy heating at a temperature of about 40° to about 75° C for about 15 to about 25 seconds; d. rolling said block by multiple pairs of rolls to form a resin-bonded abrasive sheet blank having a thickness of 1 to 15 mm.; e. blanking out a circular piece from said sheet; and f. baking said circular piece at a temperature from room temperature to 180° C for a period of 20 to 30 hours to form said wheel.
Claim 2
Independent Claim
204 words
A method for producing a resin-bonded abrasive wheel comprising the steps of: a. kneading abrasive grains having a mesh size in the range of about 16 to 220 mesh, and an uncured thermosetting synthetic resin binder therefor, in the proportion of about 60 to 90 parts by weight of abrasive grains to about 10 to 90 parts by weight of said binder, to form an abrasive composition suitable for molding; b. molding said abrasive composition at a temperature from about 70° to about 90° C and at a pressure from about 80 to about 140 kg/cm 2 for about 20 to 60 seconds, to form a molded block having a thickness of 25 to 40 mm.; c. heating said molded block by high frequency wave energy heating at a temperature of about 40° to about 75° C for about 15 to about 25 seconds; d. rolling said block by multiple pairs of rolls to form a resin-bonded abrasive sheet blank having a thickness of 1 to 15 mm.; e. blanking out a circular piece from said sheet; and f. baking said circular piece at a temperature from room temperature to 180° C for a period of 20 to 30 hours to form said wheel.
Claim 3
Dependent Claim
38 words
The method as set forth in claim 1 wherein at least one filler selected from the group consisting of creolite, iron disulfide, red iron oxide and clay is further incorporated into the abrasive composition by the kneading step.
Claim 4
Dependent Claim
42 words
The method as set forth in claim 2 wherein the abrasive composition comprises 60 to 90 parts by weight of the abrasive grains, 10 to 20 parts by weight of the binder and 0 to 20 parts by weight of the filler.
Claim 5
Dependent Claim
46 words
The method as set forth in claim 1 wherein the block of the abrasive composition has a thicknes of 25 to 40 mm and is rolled by multiple pairs of rolls of the rolling step into a sheet having a thickness of 1 to 15 mm.
Claim 6
Dependent Claim
33 words
The method as set forth in claim 4 wherein the sheet of abrasive composition is eventually rough-surfaced on its front and rear surfaces by the terminal pair of rolls of the rolling step.
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) | 1979-04-13 | 1979-10-13 | 1980-04-13 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1983-04-13 | 1983-10-13 | 1984-04-13 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1987-04-13 | 1987-10-13 | 1988-04-13 | $7700.00 | Window Closed / Lapsed |