Patent US4240806A successfully refreshed from Google Patents.
US4240806A
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Abrading material
Assignee: Minnesota Micro Metal Inc
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Filing: 1978-08-16
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Granted: 1980-12-23
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Expires: 1998-08-16
Abstract
Abstract A metal abrading material formed from acid etching with a resist pattern comprising a plurality of polygonal shapes with accentuated corners dispersed in a pattern chosen to intermix cutting points with planing edges.
Inventors
- 👤 John J. Frantzen
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-05 19:32
CPC Classifications
B; B24; B24D; B24D99/00; B24D11/00; B24D11/001; B24D11/003; B24D18/00; C; C23; C23F; C23F1/00; C23F1/02; C23F1/04; Y; Y10; Y10S; Y10S428/00; Y10S428/922; Y10S428/9265; Y10S428/932; Y10T; Y10T29/00; Y10T29/44; Y10T407/00; Y10T407/18
Claims Analysis
Total Claims: 7
Claim 1
Independent Claim
106 words
An abrading material comprising a metal sheet having a multiplicity of spaced teeth on the surface shaped so as to have a generally flat polygonal top surface with sharp cutting corners and planing edges, said corners and edges having a hardened layer at the surface to a depth that still leaves unhardened supportive metal inside, and said teeth having a base portion which is integral with the sheet and of size larger than said top surface to form a mechanically strong nonhardened support for said corners and edges, said teeth having slanted sides that slant outward from the smaller top surface to the larger base portion.
Claim 2
Dependent Claim
106 words
An abrading material comprising a metal sheet having a multiplicity of spaced teeth on the surface shaped so as to have a generally flat polygonal top surface with sharp cutting corners and planing edges, said corners and edges having a hardened layer at the surface to a depth that still leaves unhardened supportive metal inside, and said teeth having a base portion which is integral with the sheet and of size larger than said top surface to form a mechanically strong nonhardened support for said corners and edges, said teeth having slanted sides that slant outward from the smaller top surface to the larger base portion.
Claim 3
Dependent Claim
28 words
The abrading material of claim 1 in which said teeth are positioned in uniformly random positions to intermix the orientation of the cutting corners and the planing edges.
Claim 4
Dependent Claim
17 words
The abrading material of claim 2 in which said top surface and said base portion are triangular.
Claim 5
Dependent Claim
17 words
The abrading material of claim 2 in which said top surface and said base portion are square.
Claim 6
Dependent Claim
24 words
The abrading material of claim 1 in which said teeth have supporting slanted edges extending from said cutting corners to said larger base portion.
Claim 7
Dependent Claim
33 words
The abrading material of claim 5 in which said base is about twice the width of said top surface and said teeth have a height about twice the width of the top surface.
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) | 1983-12-23 | 1984-06-23 | 1984-12-23 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1987-12-23 | 1988-06-23 | 1988-12-23 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1991-12-23 | 1992-06-23 | 1992-12-23 | $7700.00 | Window Closed / Lapsed |