US4000241A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Insulation method and materials
Assignee: Individual
•
Filing: 1975-06-13
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Granted: 1976-12-28
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Expires: 1995-06-13
Abstract
Abstract Expanded perlite particles and vermiculite particles are treated with an acid solution and then with waterglass. The moist material is introduced into any insulating cavity and allowed to dry, whereupon it self-adheres into a solid insulating sheet which also adheres to the surrounding cavity surfaces. The moist material is also used to make molded articles which are then treated further with an acid solution to render them stable.
Inventors
- 👤 Daniel K. Dunn
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-08 23:50
CPC Classifications
C; C04; C04B; C04B30/00; C04B20/00; C04B20/02; C04B20/023; C04B20/10; C04B20/1055; C04B28/00; C04B28/24; C04B28/26
Claims Analysis
Total Claims: 11
Claim 1
Independent Claim
115 words
A method of forming solid and permanently fixed insulation characterized by the steps of: first applying to particles from a group consisting of expanded perlite and vermiculite an aqueous acid solution; next applying to the moistened particles an aqueous solution of waterglass; and introducing the moistened particles into the insulating cavity, said acid solutions being selected from a group consisting of acetic, hydrochloric, phosphoric, nitric, sulfuric, boric, formic, propionic, malic and citric acids, the concentrations and proportions of said acid and waterglass solutions, to each other and to the untreated particles, being effective so that, upon drying, the particles form into a solid mass by adhering to one another and to the surrounding retaining surfaces.
Claim 2
Independent Claim
115 words
A method of forming solid and permanently fixed insulation characterized by the steps of: first applying to particles from a group consisting of expanded perlite and vermiculite an aqueous acid solution; next applying to the moistened particles an aqueous solution of waterglass; and introducing the moistened particles into the insulating cavity, said acid solutions being selected from a group consisting of acetic, hydrochloric, phosphoric, nitric, sulfuric, boric, formic, propionic, malic and citric acids, the concentrations and proportions of said acid and waterglass solutions, to each other and to the untreated particles, being effective so that, upon drying, the particles form into a solid mass by adhering to one another and to the surrounding retaining surfaces.
Claim 3
Dependent Claim
20 words
A method according to claim 1 wherein said acid and waterglass solutions are sprayed onto the particles while in motion.
Claim 4
Dependent Claim
25 words
A method according to claim 1 wherein said acid solution consists of acetic acid having a concentration of from 1 to 40 percent by weight.
Claim 5
Dependent Claim
23 words
A method according to claim 3 wherein the amount of acetic acid solution is 20 to 30 ounces per cubic foot of particles.
Claim 6
Dependent Claim
22 words
A method according to claim 4 wherein the amount of waterglass solution is one-half to one gallon per cubic foot of particles.
Claim 7
Independent Claim
125 words
A method of molding construction articles characterized by the steps of: first applying to particles from a group consisting of expanded perlite and vermiculite an aqueous acid solution; next applying to the moistened particles an aqueous solution of waterglass; packing the moistened particles into a mold; heating the packed particles to drive off moisture therefrom and form the article; and then treating the formed article with an aqueous acid solution, said acid solutions being selected from a group consisting of acetic, hydrochloric, phosphoric, nitric, sulfuric, boric, formic, propionic, butanoic, malic, and citric acids, the concentrations and proportions of said acid and waterglass solutions, to each other and to the untreated particles, being effective so that, upon drying, the formed article is chemically and physically stable.
Claim 8
Independent Claim
125 words
A method of molding construction articles characterized by the steps of: first applying to particles from a group consisting of expanded perlite and vermiculite an aqueous acid solution; next applying to the moistened particles an aqueous solution of waterglass; packing the moistened particles into a mold; heating the packed particles to drive off moisture therefrom and form the article; and then treating the formed article with an aqueous acid solution, said acid solutions being selected from a group consisting of acetic, hydrochloric, phosphoric, nitric, sulfuric, boric, formic, propionic, butanoic, malic, and citric acids, the concentrations and proportions of said acid and waterglass solutions, to each other and to the untreated particles, being effective so that, upon drying, the formed article is chemically and physically stable.
Claim 9
Dependent Claim
26 words
A method according to claim 6 wherein the acid and waterglass solutions in the first and second steps are sprayed onto the particles while in motion.
Claim 10
Dependent Claim
56 words
A method according to claim 6 wherein: the acid solution of step one consists of acetic acid having the concentration of 1 to 40 percent by weight and the amount is 20 to 30 ounces per cubic foot of particles; and the amount of waterglass solution is one-half to one gallon per cubic foot of particles.
Claim 11
Dependent Claim
41 words
A method according to claim 8 wherein the acid solution of step five consists of acetic acid having a concentration of 15 to 30 percent by weight and the amount is one-half to one gallon per cubic foot of molded particles.
References Cited (Backward Citations)
US3769065A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1979-12-28 | 1980-06-28 | 1980-12-28 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1983-12-28 | 1984-06-28 | 1984-12-28 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1987-12-28 | 1988-06-28 | 1988-12-28 | $7700.00 | Window Closed / Lapsed |