Patent US4571268A successfully refreshed from Google Patents.
US4571268A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Single package zinc-rich coatings
Assignee: Sherwin Williams Co
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Filing: 1985-04-30
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Granted: 1986-02-18
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Expires: 2005-04-30
Abstract
Abstract The invention relates to a single package zinc-filled coating particularly useful as applied to metal substrates. The zinc-rich coatings comprise mixtures of partially hydrolyzed ethyl silicate with large amounts of metal particles such as zinc dust in an organic solvent with an alkali metal nitrate as the catalyst. The coating compositions are substantially stable in the absence of moisture and therefore having a long shelf life and can be applied by conventional methods to obtain completely cured films under ambient conditions.
Inventors
- 👤 Laura M. Frain
- 👤 Paul A. Petkus
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-04 16:23
CPC Classifications
C; C09; C09D; C09D5/00; C09D5/08; C09D5/10; C09D5/106
Claims Analysis
Total Claims: 12
Claim 1
Independent Claim
66 words
A single package zinc-rich coating comprising by weight of the total composition from about 1.0 to 20% by weight of a partially hydrolyzed ethyl silicate, 1.0 to 50% by weight of at least one organic solvent, 30 to 75% by weight of zinc dust and a catalytic amount of an alkali metal nitrate selected from the group consisting of potassium nitrate, lithium nitrate, and sodium nitrate.
Claim 2
Dependent Claim
66 words
A single package zinc-rich coating comprising by weight of the total composition from about 1.0 to 20% by weight of a partially hydrolyzed ethyl silicate, 1.0 to 50% by weight of at least one organic solvent, 30 to 75% by weight of zinc dust and a catalytic amount of an alkali metal nitrate selected from the group consisting of potassium nitrate, lithium nitrate, and sodium nitrate.
Claim 3
Dependent Claim
20 words
The coating of claim 1 further characterized as comprising from about 0 to 20% by weight of an inorganic filler.
Claim 4
Dependent Claim
18 words
The coating of claim 1 further characterized as comprising from about 0 to 5.0% by weight of pigment.
Claim 5
Dependent Claim
19 words
The coating of claim 1 further characterized as comprising from about 0 to 2.0% by weight of ethyl cellulose.
Claim 6
Dependent Claim
21 words
The coating of claim 1 further characterized as comprising from about 0 to 5.0% by weight of an organic polymeric thickener.
Claim 7
Dependent Claim
28 words
The coating of claim 1 further characterized in that the catalytic amount of the alkali metal nitrate ranges from about 0.1 to 1.5% by weight of lithium nitrate.
Claim 8
Dependent Claim
20 words
The coating of claim 1 further characterized in that the ethyl silicate is hydrolyzed to levels of 50 to 65%.
Claim 9
Dependent Claim
28 words
The coating of claim 1 further characterized in that the zinc dust is present in an amount ranging from about 50 to 70% by weight of the coating.
Claim 10
Dependent Claim
31 words
The coating of claim 1 further characterized in that the organic solvent comprises from about 1.0 to 10% by weight of glycol ethers and 5.0 to 20% by weight of xylene.
Claim 11
Dependent Claim
99 words
A single package zinc-rich coating comprising by weight of the total composition from about 5 to 15% by weight of ethyl silicate hydrolyzed to levels of 40 to 65%, 1.0 to 35% by weight of at least one organic solvent, 50 to 70% by weight of zinc dust, 0.1 to 1.0% by weight of ethyl cellulose, 1.0 to 10% by weight of mica, 1.0 to 10% by weight of clay, 1.0 to 2.0% by weight of an organic polymeric thickener, 0 to 2.0% by weight of pigment and catalytic amounts of 0.1 to 1.5% by weight of lithium nitrate.
Claim 12
Dependent Claim
99 words
A single package zinc-rich coating comprising by weight of the total composition from about 5 to 15% by weight of ethyl silicate hydrolyzed to levels of 40 to 65%, 1.0 to 35% by weight of at least one organic solvent, 50 to 70% by weight of zinc dust, 0.1 to 1.0% by weight of ethyl cellulose, 1.0 to 10% by weight of mica, 1.0 to 10% by weight of clay, 1.0 to 2.0% by weight of an organic polymeric thickener, 0 to 2.0% by weight of pigment and catalytic amounts of 0.1 to 1.5% by weight of lithium nitrate.
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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) | 1989-02-17 | 1989-08-19 | 1990-02-18 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1993-02-17 | 1993-08-19 | 1994-02-18 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1997-02-17 | 1997-08-19 | 1998-02-18 | $7700.00 | Window Closed / Lapsed |