Patent US4236357A successfully refreshed from Google Patents.
US4236357A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Etched metal abrasives
Assignee: Minnesota Micro Metal Inc
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Filing: 1979-05-08
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Granted: 1980-12-02
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Expires: 1999-05-08
Abstract
Abstract An etched metal abrasive formed from a laminated sheet of steel having a top layer of high carbon steel and a base layer of low carbon steel.
Inventors
- 👤 John J. Frantzen
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-03 10:17
CPC Classifications
B; B24; B24D; B24D18/00
Claims Analysis
Total Claims: 4
Claim 1
Independent Claim
102 words
A method of forming abrasive material comprising the steps of: applying an etching resist material to the surface of a smooth metal laminate sheet having a relatively low carbon steel base layer and a relatively high carbon steel top layer, said resist material being applied as a multiplicity of discreet elements on said top layer, etching away the said top layer in the areas not protected by the elements of resist so as to leave protrusions of high carbon steel extending outward from said low carbon base layer, removing the etching resist material, and hardening said protrusions by heat treating the protrusions.
Claim 2
Independent Claim
102 words
A method of forming abrasive material comprising the steps of: applying an etching resist material to the surface of a smooth metal laminate sheet having a relatively low carbon steel base layer and a relatively high carbon steel top layer, said resist material being applied as a multiplicity of discreet elements on said top layer, etching away the said top layer in the areas not protected by the elements of resist so as to leave protrusions of high carbon steel extending outward from said low carbon base layer, removing the etching resist material, and hardening said protrusions by heat treating the protrusions.
Claim 3
Dependent Claim
53 words
An abrading material comprising a multiplicity of hardened high carbon steel protrusions extending outward from a low carbon steel base sheet, said protrusions formed by etching away a layer of higher carbon steel laminated to said base sheet in all areas except those protected by a multiplicity of elements of etching resistant material.
Claim 4
Dependent Claim
53 words
An abrading material comprising a multiplicity of hardened high carbon steel protrusions extending outward from a low carbon steel base sheet, said protrusions formed by etching away a layer of higher carbon steel laminated to said base sheet in all areas except those protected by a multiplicity of elements of etching resistant material.
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) | 1983-12-02 | 1984-06-02 | 1984-12-02 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1987-12-02 | 1988-06-02 | 1988-12-02 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1991-12-02 | 1992-06-02 | 1992-12-02 | $7700.00 | Window Closed / Lapsed |