Patent US4001981A successfully refreshed from Google Patents.
US4001981A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Abrasive article
Assignee: Unicorn Industries Ltd
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Filing: 1975-06-26
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Granted: 1977-01-11
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Expires: 1995-06-26
Abstract
Abstract An abrasive article such as a cup-shaped grinding wheel is provided, said grinding wheel having a cup-shaped support member of a cross-section providing an annular support surface to which is secured an annular abrasive member consisting of an annular polyimide resin-bonded diamond abrasive member and an annular back-up member of abradable porous polyimide secured to the inside surface of the annular polyimide bonded diamond abrasive member; the porous polyimide back-up member wears away in use and therefore obviates the need for dressing the grinding wheel.
Inventors
- 👤 Everitt Franklin Wood
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-06 20:18
CPC Classifications
B; B24; B24D; B24D7/00; B24D7/02
Claims Analysis
Total Claims: 5
Claim 1
Independent Claim
152 words
An abrasive article comprising a nonabrasive support member having an annular support surface and an annular abrasive member adhesively secured directly to the annular support surface of said support member, wherein said annular abrasive member includes annular resin - bonded abrasive means so constructed and arranged as to provide the outer peripheral surface of said annular abrasive member and having an annular abrading surface, and an annular back-up member of a frangible and abradable porous polyimide resin secured to the inside surface of said annular abrasive means and to the annular support surface of said support member, said annular back-up member having an annular surface terminating in a plane coextensive with the annular abrading surface of said annular resin-bonded abrasive means, whereby said annular surface of said annular back-up member is adapted to abrade and wear away when said annular abrading surface of said annular resin-bonded abrasive means is consumed in use.
Claim 2
Dependent Claim
152 words
An abrasive article comprising a nonabrasive support member having an annular support surface and an annular abrasive member adhesively secured directly to the annular support surface of said support member, wherein said annular abrasive member includes annular resin - bonded abrasive means so constructed and arranged as to provide the outer peripheral surface of said annular abrasive member and having an annular abrading surface, and an annular back-up member of a frangible and abradable porous polyimide resin secured to the inside surface of said annular abrasive means and to the annular support surface of said support member, said annular back-up member having an annular surface terminating in a plane coextensive with the annular abrading surface of said annular resin-bonded abrasive means, whereby said annular surface of said annular back-up member is adapted to abrade and wear away when said annular abrading surface of said annular resin-bonded abrasive means is consumed in use.
Claim 3
Dependent Claim
19 words
The abrasive article of claim 1 wherein the resin of said annular resin-bonded abrasive means is a polyimide resin.
Claim 4
Dependent Claim
64 words
A self-dressing abrasive grinding wheel having an annular abrasive surface comprising a nonabrasive support member; an annular resin-bonded abrasive member adhesively secured directly to said support member; and an annular nonabrasive back-up member of an abradable porous polyimide resin secured to said annular resin-bonded abrasive member and to said nonabrasive support member, said backup member terminating in a surface coextensive with said abrasive surface.
Claim 5
Dependent Claim
64 words
A self-dressing abrasive grinding wheel having an annular abrasive surface comprising a nonabrasive support member; an annular resin-bonded abrasive member adhesively secured directly to said support member; and an annular nonabrasive back-up member of an abradable porous polyimide resin secured to said annular resin-bonded abrasive member and to said nonabrasive support member, said backup member terminating in a surface coextensive with said abrasive surface.
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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) | 1980-01-11 | 1980-07-12 | 1981-01-11 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1984-01-11 | 1984-07-12 | 1985-01-11 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1988-01-11 | 1988-07-12 | 1989-01-11 | $7700.00 | Window Closed / Lapsed |