US4370249A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Fire-retardant cellulose insulation and method of production
Assignee: SMITH FRANKLIN N JR
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Filing: 1980-07-09
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Granted: 1983-01-25
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Expires: 2000-07-09
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. Predetermined quantities of boron compounds can be added with the talc to improve the fire-suppressant characteristics of the insulation. 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
2026-10-29 05:00
CPC Classifications
F; F16; F16L; F16L59/00; F16L59/14; F16L59/145; C; C04; C04B; C04B30/00; C04B30/02; C08; C08K; C08K3/00; C08K3/34; C08K3/38; C09; C09K; C09K21/00; C09K21/02; E; E04; E04B; E04B1/00; E04B1/62; E04B1/92; E04B1/94; Y; Y02; Y02W; Y02W30/00; Y02W30/50; Y02W30/91
Claims Analysis
Total Claims: 7
Claim 1
Independent 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 20% by weight.
Claim 2
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 20% by weight.
Claim 3
Dependent Claim
24 words
The fire-resistant, cellulose insulation defined in claim 1 wherein the boron compound is selected from the group consisting of borax, boric acid, and borates.
Claim 4
Independent Claim
72 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 by mixing the ground cellulose with an inorganic material, the inorganic material comprising talc and up to 20% by weight of a boron compound; and finely grinding the cellulose and inorganic material mixture thereby providing a substantially uniform distribution of the inorganic material throughout the cellulose.
Claim 5
Independent Claim
72 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 by mixing the ground cellulose with an inorganic material, the inorganic material comprising talc and up to 20% by weight of a boron compound; and finely grinding the cellulose and inorganic material mixture thereby providing a substantially uniform distribution of the inorganic material throughout the cellulose.
Claim 6
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 20% 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 7
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 20% 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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US1932807A
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US3278383A
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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) | 1986-01-24 | 1986-07-26 | 1987-01-25 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1990-01-24 | 1990-07-26 | 1991-01-25 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1994-01-24 | 1994-07-26 | 1995-01-25 | $7700.00 | Window Closed / Lapsed |