Patent US4643840A successfully refreshed from Google Patents.
US4643840A
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Paint stripper compositions
Assignee: STWB Inc
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Filing: 1982-01-27
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Granted: 1987-02-17
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Expires: 2002-01-27
Abstract
Abstract Alkaline paint stripper compositions contain either a fibrous material or a combination of a xanthan gum and hectorite clay so as to provide a peelable skin over a painted surface.
Inventors
- 👤 Peter Brocklehurst
- 👤 Angus S. Ferguson
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-31 03:36
CPC Classifications
B; B08; B08B; B08B7/00; B08B7/0014; C; C09; C09D; C09D9/00
Claims Analysis
Total Claims: 26
Claim 1
Independent Claim
34 words
An aqueous paint stripper composition intended to provide a peelable skin over a painted surface consisting essentially of (A) an alkaline material and (B) a combination of xanthan gum and hectorite clay in water.
Claim 2
Dependent Claim
34 words
An aqueous paint stripper composition intended to provide a peelable skin over a painted surface consisting essentially of (A) an alkaline material and (B) a combination of xanthan gum and hectorite clay in water.
Claim 3
Dependent Claim
26 words
A composition according to claim 1 wherein the alkaline material is selected from the group consisting of sodium hydroxide, potassium hydroxide, sodium metasilicate and trisodium phosphate.
Claim 4
Dependent Claim
24 words
A composition according to claim 2 which includes a filler selected from the group consisting of chalk, clay, fly ash, vermiculite and wood flour.
Claim 5
Dependent Claim
16 words
A composition according to claim 3 wherein the alkaline material is sodium hydroxide or potassium hydroxide.
Claim 6
Dependent Claim
19 words
A composition according to claim 4 which includes a wetting agent, a dye, preservatives or a water-miscible organic solvent.
Claim 7
Dependent Claim
11 words
A composition according to claim 4 wherein the filler is chalk.
Claim 8
Dependent Claim
31 words
A composition according to claim 6 containing from 1 to 25% sodium hydroxide; from 25 to 75% of filler; and wherein the gum to clay ratio is from 5:1 to 1:1.
Claim 9
Dependent Claim
19 words
A composition according to claim 7 containing from 3 to 12% sodium hydroxide and from 50 to 70% filler.
Claim 10
Dependent Claim
13 words
A composition according to claim 8 containing from 3 to 7% sodium hydroxide.
Claim 11
Dependent Claim
69 words
An aqueous paint stripper composition intended to provide a peelable skin over a painted surface consisting of: (A) an alkaline material, (B) a fibrous material selected from the group consisting of ground paper, flaked paper, paper punchings, wool, textile fibers, asbestos, wood pulp, viscose fiber and ground synthetic leather, and (C) a filler selected from the group consisting of chalk, clay, fly ash, vermiculite and wood flour in water.
Claim 12
Dependent Claim
69 words
An aqueous paint stripper composition intended to provide a peelable skin over a painted surface consisting of: (A) an alkaline material, (B) a fibrous material selected from the group consisting of ground paper, flaked paper, paper punchings, wool, textile fibers, asbestos, wood pulp, viscose fiber and ground synthetic leather, and (C) a filler selected from the group consisting of chalk, clay, fly ash, vermiculite and wood flour in water.
Claim 13
Dependent Claim
26 words
A composition according to claim 10 wherein the alkaline material is selected from the group consisting of sodium hydroxide, potassium hydroxide, sodium metasilicate and trisodium phosphate.
Claim 14
Dependent Claim
33 words
A composition according to claim 11 which includes a gelling agent selected from the group consisting of polyacrylic acid, lower-alkyl polyacrylates, starch, natural gums, cellulose ethers, hydroxyethyl cellulose, xanthan gums and montmorillonite clays.
Claim 15
Dependent Claim
16 words
A composition according to claim 12 wherein the alkaline material is sodium hydroxide or potassium hydroxide.
Claim 16
Dependent Claim
16 words
A composition according to claim 11 wherein the alkaline material is sodium hydroxide or potassium hydroxide.
Claim 17
Dependent Claim
19 words
A composition according to claim 13 which includes a wetting agent, a dye, preservatives or a water-miscible organic solvent.
Claim 18
Dependent Claim
19 words
A composition according to claim 14 which includes a wetting agent, a dye, perservatives or a water-miscible organic solvent.
Claim 19
Dependent Claim
18 words
A composition according to claim 13 wherein the fibrous material is ground paper and the filler is chalk.
Claim 20
Dependent Claim
18 words
A composition according to claim 14 wherein the fibrous material is ground paper and the filler is chalk.
Claim 21
Dependent Claim
40 words
A composition according to claim 17 containing from 1 to 25% sodium hydroxide; from 0.1 to 10% of a gelling agent; from 5 to 25% of said fibrous material; and wherein the filler to fibre ratio is 6:1 to 1:1.
Claim 22
Dependent Claim
33 words
A composition according to claim 18 containing from 1 to 25% sodium hydroxide; from 5 to 25% of said fibrous material; and wherein the filler to fibre ratio is from 6:1 to 1:1.
Claim 23
Dependent Claim
30 words
A composition according to claim 19 containing from 3 to 12% sodium hydroxide; from 5 to 15% of said fibrous material; and wherein the filler to fibre ratio is 4:1.
Claim 24
Dependent Claim
30 words
A composition according to claim 20 containing from 3 to 12% sodium hydroxide; from 5 to 15% of said fibrous material; and wherein the filler to fibre ratio is 4:1.
Claim 25
Dependent Claim
22 words
A composition according to claim 21 containing from 3 to 7% sodium hydroxide and from 5 to 8% of said fibrous material.
Claim 26
Dependent Claim
22 words
A composition according to claim 22 containing from 3 to 7% sodium hydroxide and from 5 to 8% of said fibrous material.
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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) | 1990-02-16 | 1990-08-18 | 1991-02-17 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1994-02-16 | 1994-08-18 | 1995-02-17 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1998-02-16 | 1998-08-18 | 1999-02-17 | $7700.00 | Window Closed / Lapsed |