US3944685A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Preparation of heat barrier materials
Assignee: Plastonium Inc
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Filing: 1971-06-28
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Granted: 1976-03-16
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Expires: 1991-06-28
Abstract
Abstract Heat barrier materials are prepared by forming an intimate admixture of alkaline earth sulfate and finely divided carbonaceous material into a shaped composition and subjecting said shaped composition to a high temperature to cause a surface reaction to produce a coating comprising alkaline earth sulfide on the surface of said shaped composition.
Inventors
- 👤 Rudy W. Gunnerman
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-06 19:58
CPC Classifications
C; C09; C09D; C09D5/00; C04; C04B; C04B41/00; C04B41/0018; C04B41/45; C04B41/4505
Claims Analysis
Total Claims: 16
Claim 1
Independent Claim
73 words
The method of forming a heat barrier which includes applying to a surface of a shaped intimate admixture of alkaline earth sulfate and thermosetting plastic of reduced particle size, a heat source to produce an adherent alkaline earth sulfide layer upon said surface to thereby form a a heat barrier coating resistant to the penetration of thermal energy into the body of said admixture, and using said admixture as a heat barrier material.
Claim 2
Independent Claim
73 words
The method of forming a heat barrier which includes applying to a surface of a shaped intimate admixture of alkaline earth sulfate and thermosetting plastic of reduced particle size, a heat source to produce an adherent alkaline earth sulfide layer upon said surface to thereby form a a heat barrier coating resistant to the penetration of thermal energy into the body of said admixture, and using said admixture as a heat barrier material.
Claim 3
Dependent Claim
38 words
The method as defined in claim 1 wherein the layer is formed by reduction of alkaline earth sulfate by reaction with carbon produced by the decomposition of the thermosetting plastic to produce alkaline earth sulfide and carbon dioxide.
Claim 4
Dependent Claim
34 words
The method as defined in claim 1 wherein the alkaline earth sulfate is selected from the class consisting of beryllium sulfate, magnesium sulfate, calcium sulfate, strontium sulfate, barium sulfate, radium sulfate and mixtures thereof.
Claim 5
Dependent Claim
37 words
The method as defined in claim 1 wherein the thermosetting plastic is selected from the class consisting of phenolic resins, urea formaldehydes, melamine formaldehydes, and which decompose upon the application of heat thereto to provide available carbon.
Claim 6
Independent Claim
103 words
The method for forming a heat barrier including the steps of a. holding a thermosetting plastic of reduced particle size in intimate contact within a shaped matrix of alkaline earth sulfate hydrate, b. heating the surface of the composition so formed with a reducing flame to an elevated temperature at which the thermosetting plastic decomposes, c. reacting the carbon produced by the decomposition of the thermosetting plastic at said surface with the sulfate to reduce the sulfate at said surface to a sulfide, and to form an adherent heat barrier coating upon said surface, and d. using said composition as a heat barrier.
Claim 7
Independent Claim
103 words
The method for forming a heat barrier including the steps of a. holding a thermosetting plastic of reduced particle size in intimate contact within a shaped matrix of alkaline earth sulfate hydrate, b. heating the surface of the composition so formed with a reducing flame to an elevated temperature at which the thermosetting plastic decomposes, c. reacting the carbon produced by the decomposition of the thermosetting plastic at said surface with the sulfate to reduce the sulfate at said surface to a sulfide, and to form an adherent heat barrier coating upon said surface, and d. using said composition as a heat barrier.
Claim 8
Dependent Claim
47 words
The method as defined in claim 5 herein wherein the alkaline earth sulfide formed upon the surface of the composition is formed as a relatively thin coating which acts to disperse heat from said composition and forms a barrier to the transmission of heat into said composition.
Claim 9
Dependent Claim
30 words
The method as defined in claim 5 herein wherein the sulfate hydrate employed is derived from the class of beryllium sulfate, magnesium sulfate, calcium sulfate, radium sulfate and mixtures thereof.
Claim 10
Dependent Claim
53 words
The method as defined in claim 5 herein wherein the thermosetting plastic used is selected from the class consisting of thermosetting plastics including phenolic resin, urea formaldehydes, and melamine formaldehydes which decompose at elevated temperatures producing carbon which is reactive with the sulfate to reduce the same to the sulfides at elevated temperatures.
Claim 11
Independent Claim
68 words
The method of forming a heat barrier which comprises a. bonding in intimate contact an alkaline earth sulfate with thermosetting plastic of reduced particle size to form a shaped article, b. applying to the surface of said shaped article a high temperature reducing flame to produce thereon an alkaline earth sulfide coating resistant to the transmission of thermal energy, and c. using said article as a heat barrier.
Claim 12
Independent Claim
68 words
The method of forming a heat barrier which comprises a. bonding in intimate contact an alkaline earth sulfate with thermosetting plastic of reduced particle size to form a shaped article, b. applying to the surface of said shaped article a high temperature reducing flame to produce thereon an alkaline earth sulfide coating resistant to the transmission of thermal energy, and c. using said article as a heat barrier.
Claim 13
Dependent Claim
26 words
The method as defined in claim 9 a. wherein the alkaline earth sulfate is calcium sulfate and the thermosetting plastic is a heat decomposable phenolic plastic.
Claim 14
Dependent Claim
24 words
The method as defined in claim 9 a. wherein the alkaline earth sulfate and thermosetting plastic are bonded together by the addition of water.
Claim 15
Independent Claim
95 words
The method of forming a heat barrier which comprises a. mixing an alkaline earth sulfate with carbonaceous material comprising a carbon-containing material which will coke or char under the influence of heat to provide available carbon and having a maximum average particle size below about 500 microns, b. forming the resulting mixture into a shaped material, c. applying to the surface of the shaped material a high temperature atmosphere to produce thereon a coating of alkaline earth sulfide resistant to the transmission of thermal energy and d. using said shaped material as a heat barrier.
Claim 16
Independent Claim
95 words
The method of forming a heat barrier which comprises a. mixing an alkaline earth sulfate with carbonaceous material comprising a carbon-containing material which will coke or char under the influence of heat to provide available carbon and having a maximum average particle size below about 500 microns, b. forming the resulting mixture into a shaped material, c. applying to the surface of the shaped material a high temperature atmosphere to produce thereon a coating of alkaline earth sulfide resistant to the transmission of thermal energy and d. using said shaped material as a heat barrier.
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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) | 1979-03-16 | 1979-09-15 | 1980-03-16 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1983-03-16 | 1983-09-15 | 1984-03-16 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1987-03-16 | 1987-09-15 | 1988-03-16 | $7700.00 | Window Closed / Lapsed |