Patent US4397338A successfully refreshed from Google Patents.
US4397338A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Heat resistant protective coating
Assignee: CUNNINGHAM & THOMPSON Inc BLVD A CORP OF PA
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Filing: 1981-11-02
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Granted: 1983-08-09
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Expires: 2001-11-02
Abstract
Abstract A heat resistant protective coating is comprised of a composition including 14 to 21 percent by weight of an alkali metal silicate; 20 to 35 percent by weight of magnesium silicate; a blowing agent; and water. The composition upon heating intumesces to form a closed cell structure which provides insulation to a coated substrate. The coating composition is particularly useful in coating steel pipe to form an intumesced closed cell composition on the steel pipe. The pipe can be used as an oxygen lance in producing steel or as an aluminum flux rod.
Inventors
- 👤 Glenn R. Cunningham
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-29 17:49
CPC Classifications
C; C04; C04B; C04B28/00; C04B28/24; C04B28/26; F; F16; F16L; F16L59/00; F16L59/02; F16L59/028; C04B2111/00; C04B2111/00474; C04B2111/00482; Y; Y10; Y10S; Y10S138/00; Y10S138/09; Y10T; Y10T428/00; Y10T428/13
Claims Analysis
Total Claims: 16
Claim 1
Independent Claim
26 words
A foamable coating composition comprising: 14 to 21 percent by weight alkali metal silicate; 20 to 35 percent by weight magnesium silicate; and the balance water.
Claim 2
Dependent Claim
26 words
A foamable coating composition comprising: 14 to 21 percent by weight alkali metal silicate; 20 to 35 percent by weight magnesium silicate; and the balance water.
Claim 3
Dependent Claim
15 words
The foamable coating composition of claim 1 wherein said alkali metal silicate is sodium silicate.
Claim 4
Dependent Claim
15 words
The foamable coating composition of claim 1 wherein said magnesium silicate is in particulate form.
Claim 5
Dependent Claim
11 words
The foamable coating composition of claim 1 including a blowing agent.
Claim 6
Dependent Claim
25 words
The formable coating composition of claim 4 wherein said blowing agent is present at a level of 0.05 to 0.10 percent in said coating composition.
Claim 7
Dependent Claim
15 words
The foamable coating composition of claim 4 wherein said blowing agent is a formaldehyde condensate.
Claim 8
Dependent Claim
16 words
The foamable coating composition of claim 6 wherein said formaldehyde condensate is a urea formaldehyde condensate.
Claim 9
Dependent Claim
26 words
A closed cell intumesced coating composition comprised of: 14 to 21 parts by weight alkali metal silicate; and 20 to 35 parts by weight magnesium silicate.
Claim 10
Dependent Claim
26 words
A closed cell intumesced coating composition comprised of: 14 to 21 parts by weight alkali metal silicate; and 20 to 35 parts by weight magnesium silicate.
Claim 11
Dependent Claim
14 words
The coating composition of claim 8 wherein said alkali metal silicate is sodium silicate.
Claim 12
Dependent Claim
28 words
A pipe coated with a composition comprising: 14 to 21 parts by weight alkali metal silicate; 20 to 35 parts by weight magnesium silicate; and the balance water.
Claim 13
Dependent Claim
28 words
A pipe coated with a composition comprising: 14 to 21 parts by weight alkali metal silicate; 20 to 35 parts by weight magnesium silicate; and the balance water.
Claim 14
Dependent Claim
14 words
The coated pipe of claim 10 wherein said alkali metal silicate is sodium silicate.
Claim 15
Dependent Claim
22 words
The coated pipe of claim 10 wherein said coating is intumesced and closed celled and having a density of 1.00 to 1.10.
Claim 16
Dependent Claim
10 words
The coated pipe of claim 10 including a blowing agent.
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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) | 1986-08-08 | 1987-02-07 | 1987-08-09 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1990-08-08 | 1991-02-07 | 1991-08-09 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1994-08-08 | 1995-02-07 | 1995-08-09 | $7700.00 | Window Closed / Lapsed |