US4172804A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Method of preparing fire retardant insulation
Assignee: DIVERSIFIELD INSULATION Inc
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Filing: 1977-11-21
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Granted: 1979-10-30
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Expires: 1997-11-21
Abstract
Abstract A method of preparing fire retardant cellulosic fiber insulation which includes the steps of reacting borax with a source of hydrogen ions such as sulfuric acid or various other acids or acid salts in an amount sufficient to convert at least about 20% of the borax into boric acid and a sodium salt and then mixing the resulting composition with a cellulosic fiber base.
Inventors
- 👤 George Christianson
- 👤 John D. Pollock
- 👤 William R. Freischel
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-30 21:08
CPC Classifications
C; C09; C09K; C09K21/00; C09K21/02; C04; C04B; C04B18/00; C04B18/04; C04B18/18; C04B18/24; C04B18/28; Y; Y02; Y02W; Y02W30/00; Y02W30/50; Y02W30/91
Claims Analysis
Total Claims: 13
Claim 1
Independent Claim
115 words
A method of preparing fire retardant cellulosic insulation comprising: reacting a quantity of borax with a source of hydrogen ions in an amount sufficient to convert at least about 20% of the borax into boric acid and a sodium salt, but less than the stoiciometrical amount necessary to react completely with said quantity of borax, the amount of hydrogen ions relative to the quantity of borax further being such as to result in an alkaline composition having a pH between about 7.0 and 8.0; pulverizing the resulting composition; preparing a cellulosic fiber base by shredding and pulverizing cellulosic materials; and directly mixing the resulting composition with said cellulosic fiber base without further purification or processing.
Claim 2
Independent Claim
115 words
A method of preparing fire retardant cellulosic insulation comprising: reacting a quantity of borax with a source of hydrogen ions in an amount sufficient to convert at least about 20% of the borax into boric acid and a sodium salt, but less than the stoiciometrical amount necessary to react completely with said quantity of borax, the amount of hydrogen ions relative to the quantity of borax further being such as to result in an alkaline composition having a pH between about 7.0 and 8.0; pulverizing the resulting composition; preparing a cellulosic fiber base by shredding and pulverizing cellulosic materials; and directly mixing the resulting composition with said cellulosic fiber base without further purification or processing.
Claim 3
Dependent Claim
35 words
The method of claim 1 wherein the source of hydrogen ions is selected from the group consisting of: sulfuric acid, hydrochloric acid, nitric acid, phosphoric acid, sodium acid sulfate, potassium acid sulfate and sodium sulfite.
Claim 4
Dependent Claim
20 words
The method of claim 1 wherein the source of hydrogen ions is sulfuric acid and the borax is five-mole borax.
Claim 5
Dependent Claim
22 words
The method of claim 3 wherein the amount of sulfuric acid reacted with the borax is at least about 5% by weight.
Claim 6
Dependent Claim
23 words
The method of claim 4 wherein the amount of sulfuric acid reacted with the borax is between about 10% and 15% by weight.
Claim 7
Dependent Claim
23 words
The method of claim 4 wherein the amount of sulfuric acid reacted with the borax is between about 20% and 25% by weight.
Claim 8
Dependent Claim
32 words
The method of claim 1 including mixing a third material with the hydrogen ion source-borax mixture in a quantity sufficient to maintain the pH of said mixture at between 7.0 and 8.0.
Claim 9
Dependent Claim
24 words
The method of claim 7 including adding said third material in a quantity sufficient to maintain the pH of said mixture at about 7.5.
Claim 10
Dependent Claim
39 words
The method of claim 8 wherein the borax is five-mole borax and the source of hydrogen ions is sulfuric acid and wherein the amount of sulfuric acid relative to said borax is between approximately 10% and 15% by weight.
Claim 11
Dependent Claim
12 words
The method of claim 9 wherein said third material is aluminum sulfate.
Claim 12
Dependent Claim
26 words
The method of claim 10 wherein said aluminum sulfate is mixed with said sulfuric acid-borax mixture in an amount between approximately 20% and 23% by weight.
Claim 13
Dependent Claim
18 words
The method of claim 10 including preparing said cellulosic fiber base by exposing cellulosic materials to a hammermill.
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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) | 1982-10-29 | 1983-04-30 | 1983-10-30 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1986-10-29 | 1987-04-30 | 1987-10-30 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1990-10-29 | 1991-04-30 | 1991-10-30 | $7700.00 | Window Closed / Lapsed |