Patent US4454267A successfully refreshed from Google Patents.
US4454267A
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US
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Lightweight joint compound
Assignee: United States Gypsum Co
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Filing: 1982-12-20
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Granted: 1984-06-12
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Expires: 2002-12-20
Abstract
Abstract A lightweight joint compound for use in finishing joints between gypsum wallboards, comprising a filler, a binder, a specially treated expanded perlite, a non-leveling agent, and a thickener.
Inventors
- 👤 Terrance L. Williams
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-04 22:44
CPC Classifications
C; C09; C09K; C09K3/00; C09K3/10; C04; C04B; C04B26/00; C04B26/02; C04B26/04; C09K3/1006; C09K3/1015; C09K2200/00; C09K2200/02; C09K2200/0217; C09K2200/023; C09K2200/0239; C09K2200/0243; C09K2200/0252; C09K2200/06; C09K2200/0615; C09K2200/0622; C09K2200/068; C09K2200/0685
Claims Analysis
Total Claims: 30
Claim 1
Independent Claim
99 words
A lightweight joint compound having properties suitable for use in finishing joints between the edges of adjacent wallboards, said joint compound consisting essentially of: (1) a filler selected from the group consisting of calcium carbonate and calcium sulfate, (2) a non-leveling agent, (3) expanded perlite which has been treated with a silicone compound to render it water-insensitive present in an amount of from about 3.5% to about 25% based on the dry weight of said joint compound, (4) a thickener, (5) a binder, and (6) sufficient water to adjust the viscosity to render said joint compound suitable for use.
Claim 2
Dependent Claim
99 words
A lightweight joint compound having properties suitable for use in finishing joints between the edges of adjacent wallboards, said joint compound consisting essentially of: (1) a filler selected from the group consisting of calcium carbonate and calcium sulfate, (2) a non-leveling agent, (3) expanded perlite which has been treated with a silicone compound to render it water-insensitive present in an amount of from about 3.5% to about 25% based on the dry weight of said joint compound, (4) a thickener, (5) a binder, and (6) sufficient water to adjust the viscosity to render said joint compound suitable for use.
Claim 3
Dependent Claim
29 words
A lightweight joint compound according to claim 1, wherein said filler is present in an amount from about 38% to about 93% by dry weight of said joint compound.
Claim 4
Dependent Claim
14 words
A lightweight joint compound according to claim 2, wherein said filler is calcium carbonate.
Claim 5
Dependent Claim
14 words
A lightweight joint compound according to claim 3, wherein said filler is calcium sulfate.
Claim 6
Dependent Claim
31 words
A lightweight joint compound according to claim 1, wherein said non-leveling agent is present in an amount of from about 0.5% to about 7% by dry weight of said joint compound.
Claim 7
Dependent Claim
15 words
A lightweight joint compound according to claim 5, wherein said non-leveling agent is attapulgus clay.
Claim 8
Dependent Claim
29 words
A lightweight joint compound according to claim 5, wherein said non-leveling agent is a mixture of a clay and amylopectin starch in a ratio by weight of about 1:5.
Claim 9
Dependent Claim
30 words
A lightweight joint compound according to claim 1, wherein said binder is present in an amount of from about 0.5% to about 10% by dry weight of said joint compound.
Claim 10
Dependent Claim
14 words
A lightweight joint compound according to claim 8, wherein said binder is polyvinyl acetate.
Claim 11
Dependent Claim
23 words
A lightweight joint compound according to claim 1, wherein said thickener is present in an amount of from about 0.3% to about 1.8%.
Claim 12
Dependent Claim
14 words
A lightweight joint compound according to claim 10, wherein said thickener is hydroxypropyl methylcellulose.
Claim 13
Dependent Claim
13 words
A lightweight joint compound according to claim 10, wherein said thickener is hydroxyethylcellulose.
Claim 14
Dependent Claim
14 words
A lightweight joint compound according to claim 1, which is substantially free of mica.
Claim 15
Independent Claim
100 words
A method of joining the edges of adjacent gypsum wallboard panels which comprises: A. applying a lightweight joint compound over said edges consisting essentially of: (1) a filler selected from the group consisting of calcium carbonate and calcium sulfate, (2) a non-leveling agent, (3) expanded perlite treated with a silicone compound to render it water-insensitive, in an amount of from about 3.5% to about 25% of the dry weight of said joint compound, (4) a thickener, (5) a binder, and (6) water, B. permitting said joint compound to dry, and C. sanding said joint compound to achieve a smooth joint.
Claim 16
Independent Claim
100 words
A method of joining the edges of adjacent gypsum wallboard panels which comprises: A. applying a lightweight joint compound over said edges consisting essentially of: (1) a filler selected from the group consisting of calcium carbonate and calcium sulfate, (2) a non-leveling agent, (3) expanded perlite treated with a silicone compound to render it water-insensitive, in an amount of from about 3.5% to about 25% of the dry weight of said joint compound, (4) a thickener, (5) a binder, and (6) water, B. permitting said joint compound to dry, and C. sanding said joint compound to achieve a smooth joint.
Claim 17
Dependent Claim
27 words
A method according to claim 14, wherein said filler is present in an amount from about 38% to about 93% by dry weight of said joint compound.
Claim 18
Dependent Claim
12 words
A method according to claim 15, wherein said filler is calcium carbonate.
Claim 19
Dependent Claim
13 words
A method according to claim 15, wherein said filler is a calcium sulfate.
Claim 20
Dependent Claim
29 words
A method according to claim 14, wherein said non-leveling agent is present in an amount of from about 0.5% to about 7% by dry weight of said joint compound.
Claim 21
Dependent Claim
13 words
A method according to claim 18, wherein said non-leveling agent is attapulgus clay.
Claim 22
Dependent Claim
26 words
A method according to claim 18, wherein said non-leveling agent is a mixture of a clay and amylopectin starch in a ratio by weight of 1:5.
Claim 23
Dependent Claim
28 words
A method according to claim 14, wherein said binder is present in an amount of from about 0.5% to about 10% by dry weight of said joint compound.
Claim 24
Dependent Claim
12 words
A method according to claim 21, wherein said binder is polyvinyl acetate.
Claim 25
Dependent Claim
21 words
A method according to claim 14, wherein said thickener is present in an amount of from about 0.3% to about 1.8%.
Claim 26
Dependent Claim
12 words
A method according to claim 23, wherein said thickener is hydroxypropyl methylcellulose.
Claim 27
Dependent Claim
11 words
A method according to claim 23, wherein said thickener is hydroxyethylcellulose.
Claim 28
Dependent Claim
15 words
A method according to claim 14, wherein said joint compound is substantially free of mica.
Claim 29
Dependent Claim
16 words
A lightweight joint compound according to claim 1, wherein said silicone compound is a polydimethyl siloxane.
Claim 30
Dependent Claim
14 words
A method according to claim 14, wherein said silicone compound is a polydimethyl siloxane.
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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) | 1987-06-12 | 1987-12-12 | 1988-06-12 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1991-06-12 | 1991-12-12 | 1992-06-12 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1995-06-12 | 1995-12-12 | 1996-06-12 | $7700.00 | Window Closed / Lapsed |