US4230585A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Fire-retardant cellulose insulation and process for making same
Assignee: White-Bird Enterprises Inc
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Filing: 1978-11-15
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Granted: 1980-10-28
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Expires: 1998-11-15
Abstract
Abstract A fire-resistant, cellulose insulation and method, the cellulose insulation including a predetermined quantity of talc to impart the desired degree of fire-resistant characteristics to the cellulose. If desired, limited quantities of boron compounds can be added with the talc. The method includes directing ground cellulose from the primary grinding stage into a surge bin to accommodate metering the talc with the cellulose to thereby assure the appropriate distribution ratio of talc in the cellulose.
Inventors
- 👤 Thomas O. Bird
- 👤 Jack White
- 👤 Carl H. Bird
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-04 22:04
CPC Classifications
F; F16; F16L; F16L59/00; F16L59/14; F16L59/145; C; C08; C08K; C08K3/00; C08K3/34; C08K7/00; C08K7/02; C08K7/04; C08K7/10; C09; C09K; C09K21/00; C09K21/02; E; E04; E04B; E04B1/00; E04B1/62; E04B1/92; E04B1/94
Claims Analysis
Total Claims: 17
Claim 1
Independent Claim
34 words
A fire-resistant, cellulose insulation consisting of a finely divided cellulose intimately mixed with talc, the talc being present in an amount within the range on the order of about 5% to 25% by weight.
Claim 2
Dependent Claim
34 words
A fire-resistant, cellulose insulation consisting of a finely divided cellulose intimately mixed with talc, the talc being present in an amount within the range on the order of about 5% to 25% by weight.
Claim 3
Dependent Claim
51 words
A fire-resistant, cellulose insulation comprising a finely divided cellulose intimately mixed with talc, the talc being present in an amount within the range on the order of about 5% to 25% by weight and wherein a boron compound is added to the talc in amounts ranging up to 10% by weight.
Claim 4
Dependent Claim
51 words
A fire-resistant, cellulose insulation comprising a finely divided cellulose intimately mixed with talc, the talc being present in an amount within the range on the order of about 5% to 25% by weight and wherein a boron compound is added to the talc in amounts ranging up to 10% by weight.
Claim 5
Dependent Claim
24 words
The fire-resistant, cellulose insulation defined in claim 2 wherein the boron compound is selected from the group consisting of borax, boric acid, and borates.
Claim 6
Dependent Claim
29 words
The fire-resistant, cellulose insulation defined in claim 1 wherein a non-flamable, silicone oil is added to the cellulose and talc in amounts ranging up to about 5% by weight.
Claim 7
Independent Claim
61 words
A method for producing a fire-resistant, cellulose insulation comprising: grinding a cellulose raw material in a first grinding stage; imparting a fire-resistant characteristic to the cellulose with an inorganic material consisting of talc by mixing the talc with the ground cellulose; and finely grinding the cellulose and talc mixture thereby providing a substantially uniform distribution of the talc throughout the cellulose.
Claim 8
Independent Claim
61 words
A method for producing a fire-resistant, cellulose insulation comprising: grinding a cellulose raw material in a first grinding stage; imparting a fire-resistant characteristic to the cellulose with an inorganic material consisting of talc by mixing the talc with the ground cellulose; and finely grinding the cellulose and talc mixture thereby providing a substantially uniform distribution of the talc throughout the cellulose.
Claim 9
Dependent Claim
22 words
A method of claim 5 wherein the cellulose raw material is selected from the group consisting of newsprint, kraft paper, and cardboard.
Claim 10
Dependent Claim
30 words
The method of claim 5 wherein the talc is added to the cellulose in an amount within the range on the order of about 5% to 25%, talc by weight.
Claim 11
Dependent Claim
36 words
The method of claim 5 wherein the process further comprises introducing the ground cellulose from the first grinding stage into a surge bin to accommodate improved control over the mixing ratio of talc with the cellulose.
Claim 12
Dependent Claim
25 words
The method of claim 5 wherein the mixing step further comprises incorporating boric acid with the talc in amounts ranging up to 10% by weight.
Claim 13
Dependent Claim
34 words
The method of claim 5 wherein the mixing step further comprises injecting a nonflammable oil into the talc and cellulose mixture, the oil suppressing dust and improving adherence between the talc and the cellulose.
Claim 14
Dependent Claim
25 words
The method of claim 10 wherein the oil is a silicone oil and is added to the mixture in amounts less than 5% by weight.
Claim 15
Dependent Claim
32 words
The method of claim 5 wherein the finely grinding step further comprises grinding the talc and cellulose in a hammermill having a hammer tip speed greater than about 20,000 feet per minute.
Claim 16
Independent Claim
98 words
A method for producing a fire-resistant, cellulose insulation comprising: subjecting a cellulose material to an initial grinding step; introducing the ground cellulose into a surge bin to accommodate a controlled processing of the ground cellulose; mixing talc with the ground cellulose in an amount within the range on the order of about 5% to 25% by weight talc to ground cellulose; adding a boron compound to the talc in amounts ranging up to 10% by weight; and blending the talc and boron compound with the cellulose by subjecting the talc, boron compound and cellulose mixture to additional grinding.
Claim 17
Independent Claim
98 words
A method for producing a fire-resistant, cellulose insulation comprising: subjecting a cellulose material to an initial grinding step; introducing the ground cellulose into a surge bin to accommodate a controlled processing of the ground cellulose; mixing talc with the ground cellulose in an amount within the range on the order of about 5% to 25% by weight talc to ground cellulose; adding a boron compound to the talc in amounts ranging up to 10% by weight; and blending the talc and boron compound with the cellulose by subjecting the talc, boron compound and cellulose mixture to additional grinding.
References Cited (Backward Citations)
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Cited
FR748236A
Cited
US1932807A
Cited
US3278383A
Cited
US3458327A
Cited
US3558486A
Cited
US4089785A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1983-10-28 | 1984-04-28 | 1984-10-28 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1987-10-28 | 1988-04-28 | 1988-10-28 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1991-10-28 | 1992-04-28 | 1992-10-28 | $7700.00 | Window Closed / Lapsed |