EP0004454A2
Expired / Lapsed
EP
⏱️ 0.0 years remaining
Improvements in coated abrasives
Assignee: Individual
•
Filing: 1979-03-20
•
Granted: —
•
Expires: 1999-03-20
Abstract
Abstract Coated abrasives comprising a sheet (1) of paper or fabric coated with abrasive particles in an adhesive binder are made more flexible and longer-lasting by applying the abrasive particles in the binder in an array of discrete dots (3) covering only part of the area of the sheet. The performance of the product is further improved by the use of a backing sheet (2) of flexible synthetic foam material. The products are sanding sheets which may be made into belts or discs for use on machines and tools, cleaning and polishing sheets, and dishwashing pads.
Inventors
- 👤 Robert Michael Barron
Bibliographic Details
Application Number
—
Jurisdiction
EP
Data Source
google_patents
Last Synchronized
2026-10-28 05:58
CPC Classifications
B; B24; B24D; B24D11/00
Claims Analysis
Total Claims: 14
Claim 1
Independent Claim
26 words
An abrasive sheet comprising a flexible substrate carrying a multiplicity of discrete dots each consisting of an adhesive binder material containing abrasive or other mineral particles.
Claim 2
Dependent Claim
26 words
An abrasive sheet comprising a flexible substrate carrying a multiplicity of discrete dots each consisting of an adhesive binder material containing abrasive or other mineral particles.
Claim 3
Dependent Claim
14 words
A sheet as claimed in claim 1 wherein the dots are circular in plan.
Claim 4
Dependent Claim
21 words
A sheet as claimed in claim 1 or 2 in which each dot is substantially in the form of a disc.
Claim 5
Dependent Claim
19 words
A sheet as claimed in any of the preceding claims in which the dots are in a regular array.
Claim 6
Dependent Claim
26 words
A sheet as claimed in any of the preceding claims in which the dots cover from 20% to 60% of the total area of the sheet.
Claim 7
Dependent Claim
21 words
A sheet as claimed in any of the preceding claims in which the dots have diameters between 1.0 and 10.0 mm.
Claim 8
Dependent Claim
34 words
A sheet as claimed in any of the preceding claims in which the coating weight of the dots, that is the weight of binder material plus mineral particles, is 50 - 1000 g/m .
Claim 9
Dependent Claim
20 words
A sheet as claimed in any of the preceding claims in which the flexible substrate is a waterproofed kraft paper.
Claim 10
Dependent Claim
21 words
A sheet as claimed in any of the preceding claims in which the flexible substrate comprises a layer of woven fabric.
Claim 11
Dependent Claim
29 words
A sheet as claimed in any of the preceding claims in which the flexible substrate comprises a carrier layer for the dots and a backing layer of foam material.
Claim 12
Dependent Claim
17 words
A sheet as claimed in claim 10 in which the foam material is a synthetic plastics material.
Claim 13
Dependent Claim
17 words
A sheet as claimed in claim 10 in which the foam material is cross- linked polyethylene foam.
Claim 14
Dependent Claim
30 words
A sheet as claimed in any of the preceding claims in which the ratio of the weight of mineral particles to the weight of binder is between 1:1 and 10:1.
References Cited (Backward Citations)
No citation records indexed.
USPTO Annuity & Maintenance Windows
Maintenance schedule is calculated for granted US utility patents.