Patent US4307142A successfully refreshed from Google Patents.
US4307142A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Corrosion-resistant coating composition containing hollow microballoons
Assignee: T C Manufacturing Co Inc
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Filing: 1980-08-08
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Granted: 1981-12-22
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Expires: 2000-08-08
Abstract
Abstract A fluoroelastomer-hollow glass microsphere coating has been found to provide new and unexpected corrosion resistance to metal surfaces for protection against severely corrosive environments. The coating comprises a fluorocarbon elastomer and 3-50% by volume of hollow glass microspheres or microballoons having a size in the range of about 2-300 microns, preferably 20-200 microns. The hollow glass microspheres or microballoons substantially increases the corrosion resistance of a fluoroelastomeric liquid composition, yielding new and unexpected thermal and chemical resistance, particularly when the coating composition is applied in two or more layers.
Inventors
- 👤 John Blitstein
- 👤 Donald Kathrein
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-28 10:02
CPC Classifications
C; C08; C08J; C08J9/00; C08J9/32; B; B05; B05D; B05D7/00; B05D7/14; C09; C09D; C09D5/00; C09D5/08; C08J2327/00; C08J2327/02; C08J2327/12; Y; Y10; Y10T; Y10T428/00; Y10T428/24; Y10T428/24355; Y10T428/24372; Y10T428/24421; Y10T428/24942; Y10T428/2495; Y10T428/24967; Y10T428/24975; Y10T428/25; Y10T428/252; Y10T428/31504; Y10T428/3154; Y10T428/31544
Claims Analysis
Total Claims: 12
Claim 1
Independent Claim
72 words
A substrate coated with a protective coating comprising a generally planar layer of fluoroelastomer and a plurality of hollow microspheres protruding upwardly from said fluoroelastomer layer, each of said microspheres, being encapsulated in said fluoroelastomer, said microspheres having a particle size in the range of about 2 to about 300 microns and included in said fluoroelastomer in an amount of about 3 to about 50 percent by volume of fluoroelastomer plus microspheres.
Claim 2
Dependent Claim
72 words
A substrate coated with a protective coating comprising a generally planar layer of fluoroelastomer and a plurality of hollow microspheres protruding upwardly from said fluoroelastomer layer, each of said microspheres, being encapsulated in said fluoroelastomer, said microspheres having a particle size in the range of about 2 to about 300 microns and included in said fluoroelastomer in an amount of about 3 to about 50 percent by volume of fluoroelastomer plus microspheres.
Claim 3
Dependent Claim
17 words
A coated metal substrate as defined in claim 8 wherein said fluoroelastomer comprises a fluorinated olefinic elastomer.
Claim 4
Dependent Claim
21 words
A coated substrate as defined in claim 1 wherein said fluoroelastomer is a copolymer of two of more fluorinated olefinic polymers.
Claim 5
Dependent Claim
19 words
A coated substrate as defined in claim 1 wherein said fluoroelastomer comprises a copolymer of hexafluoropropylene and vinylidene fluoride.
Claim 6
Dependent Claim
33 words
A coated substrate as defined in claim 1 wherein said microspheres comprise hollow sodium borosilicate glass microballoons in an amount of about 20 to about 40 percent by volume of fluoroelastomer plus microballoons.
Claim 7
Dependent Claim
22 words
A coated substrate as defined in claim 1 wherein said microspheres have an average diameter of about 50 to about 100 microns.
Claim 8
Dependent Claim
13 words
A coated substrate as defined in claim 1 wherein said substrate comprises metal.
Claim 9
Dependent Claim
19 words
A coated substrate as defined in claim 1 wherein said substrate comprises a metallic interior portion of a chimney.
Claim 10
Dependent Claim
18 words
A coated substrate as defined in claim 1 wherein said coating is in a thickness of 1-60 mils.
Claim 11
Dependent Claim
30 words
A coated substrate as defined in claim 1 further including a second layer of said protective coating, said second layer applied over a first layer after drying said first layer.
Claim 12
Dependent Claim
24 words
A coated substrate as defined in claim 10 wherein said first and second coatings are each applied in a dry thickness of 1-20 mils.
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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) | 1984-12-21 | 1985-06-22 | 1985-12-22 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1988-12-21 | 1989-06-22 | 1989-12-22 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1992-12-21 | 1993-06-22 | 1993-12-22 | $7700.00 | Window Closed / Lapsed |