Patent US4138228A successfully refreshed from Google Patents.
US4138228A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Abrasive of a microporous polymer matrix with inorganic particles thereon
Assignee: Individual
•
Filing: 1977-02-02
•
Granted: 1979-02-06
•
Expires: 1997-02-02
Abstract
Abstract An improved article for preparing critical surfaces, in particular for polishing, comprises means including a surface carrying a polishing abrasive of an average particle size less than 10 microns carried on a polymer matrix which has at least one of the following properties, microporosity, hydrophilicity and weak bonding to the polishing abrasive.
Inventors
- 👤 Jorgen Hartfelt
- 👤 Ralf Hoehn
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-24 21:03
CPC Classifications
B; B24; B24D; B24D11/00
Claims Analysis
Total Claims: 12
Claim 1
Independent Claim
58 words
An improved article for preparing critical surfaces, consisting essentially of platelets of a polymer and an inorganic polishing abrasive of an average particle size less than 10 microns, the platelets forming a microporous sponge-like polymer matrix which is liquid absorbing, essentially all of the abrasive particles being entirely unencapsulated and being carried on the surfaces of the platelets.
Claim 2
Dependent Claim
58 words
An improved article for preparing critical surfaces, consisting essentially of platelets of a polymer and an inorganic polishing abrasive of an average particle size less than 10 microns, the platelets forming a microporous sponge-like polymer matrix which is liquid absorbing, essentially all of the abrasive particles being entirely unencapsulated and being carried on the surfaces of the platelets.
Claim 3
Dependent Claim
17 words
An article according to claim 1, in which the polymer is a hydrophilic aqueous liquid adsorbing polymer.
Claim 4
Dependent Claim
24 words
An article according to claim 1, in which the polishing abrasive is selected from the group consisting of rare earth oxides and metallic oxides.
Claim 5
Dependent Claim
37 words
An article according to claim 3, in which the polishing abrasive is selected from the group consisting of cerium oxide, zirconium oxide, alumina, ferric oxide, tin oxide, colloidal silica, chromium oxide, jewelers rouge, pumice and quartz flour.
Claim 6
Dependent Claim
73 words
An improved article for preparing critical surfaces, consisting essentially of a polymer which bonds weakly to polishing abrasives and a polishing abrasive of an average particle size less than 10 microns, the bonding being sufficiently weak that the rubbing of the surface in a polishing operation will effect controlled release of polishing abrasive from the polymer, essentially all of the abrasive particles being entirely unencapsulated and being only weakly bonded onto the polymer.
Claim 7
Dependent Claim
73 words
An improved article for preparing critical surfaces, consisting essentially of a polymer which bonds weakly to polishing abrasives and a polishing abrasive of an average particle size less than 10 microns, the bonding being sufficiently weak that the rubbing of the surface in a polishing operation will effect controlled release of polishing abrasive from the polymer, essentially all of the abrasive particles being entirely unencapsulated and being only weakly bonded onto the polymer.
Claim 8
Dependent Claim
72 words
An improved article for preparing critical surfaces, consisting essentially of a substrate and abrasive means supported on the substrate, the abrasive means consisting essentially of platelets of a polymer and an inorganic polishing abrassive of an average particle size less than 10 microns, the platelets forming a microporous sponge-like polymer matrix which is liquid absorbing, essentially of the abrasive particles being entirely unencapsulated and being carried on the surfaces of the platelets.
Claim 9
Dependent Claim
72 words
An improved article for preparing critical surfaces, consisting essentially of a substrate and abrasive means supported on the substrate, the abrasive means consisting essentially of platelets of a polymer and an inorganic polishing abrassive of an average particle size less than 10 microns, the platelets forming a microporous sponge-like polymer matrix which is liquid absorbing, essentially of the abrasive particles being entirely unencapsulated and being carried on the surfaces of the platelets.
Claim 10
Dependent Claim
12 words
An article according to claim 6, in which said substrate is flexible.
Claim 11
Dependent Claim
15 words
An article according to claim 7, in which said substrate comprises a textile or paper.
Claim 12
Dependent Claim
14 words
An article according to claim 8, comprising a self-supporting body formed of said mixture.
References Cited (Backward Citations)
US2554070A
Cited
US2876085A
Cited
US2980524A
Cited
GB969535A
Cited
US3256075A
Cited
US3262233A
Cited
US3128580A
Cited
US3607159A
Cited
US3713796A
Cited
US3653859A
Cited
US3804607A
Cited
US3710517A
Cited
US3906684A
Cited
US3773480A
Cited
US3918220A
Cited
US3928949A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1982-02-05 | 1982-08-07 | 1983-02-06 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1986-02-05 | 1986-08-07 | 1987-02-06 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1990-02-05 | 1990-08-07 | 1991-02-06 | $7700.00 | Window Closed / Lapsed |