Patent US4372997A successfully refreshed from Google Patents.
US4372997A
Expired / Lapsed
US
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Heat- and flame-resistant sheet material
Assignee: 3M Co
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Filing: 1982-04-09
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Granted: 1983-02-08
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Expires: 2002-04-09
Abstract
Abstract Fire- and heat-resistant sheet material comprises fibrous webs adhered together with asphalt which is filled with inorganic particles, intumescable granules, and a catalyst which catalyzes charring of the asphalt.
Inventors
- 👤 Gary D. Fritze
- 👤 Joseph Graham
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-01 21:12
CPC Classifications
B; B32; B32B; B32B11/00; B32B11/10; E; E04; E04B; E04B1/00; E04B1/62; E04B1/92; E04B1/94; B32B2325/00; B32B2375/00; B32B2419/00; B32B2419/06; Y; Y10; Y10S; Y10S428/00; Y10S428/92; Y10S428/921; Y10T; Y10T428/00; Y10T428/24; Y10T428/24355; Y10T428/24372; Y10T428/2438; Y10T428/24421; Y10T428/25; Y10T428/252; Y10T428/256; Y10T428/257; Y10T428/259; Y10T428/31504; Y10T428/31678; Y10T428/31717; Y10T428/31815; Y10T442/00; Y10T442/60; Y10T442/659; Y10T442/67; Y10T442/696
Claims Analysis
Total Claims: 16
Claim 1
Independent Claim
105 words
A fire- and heat-resistant sheet material comprising at least two fibrous webs formed from a material that does not ignite or soften at temperatures lower than about 150° C.; asphalt disposed between, impregnated in, and adhering the fibrous webs together; inorganic filler particles dispersed in the asphalt in a volume ratio between about 1:10 and 1:1 particles to asphalt; intumescable granules dispersed in the asphalt in an amount of at least about 5 volume-parts per 100 parts of asphalt; and iron- and halogen-containing material dispersed in the asphalt and which catalyzes the charring of asphalt upon heating of the asphalt to 175° C. or more.
Claim 2
Dependent Claim
105 words
A fire- and heat-resistant sheet material comprising at least two fibrous webs formed from a material that does not ignite or soften at temperatures lower than about 150° C.; asphalt disposed between, impregnated in, and adhering the fibrous webs together; inorganic filler particles dispersed in the asphalt in a volume ratio between about 1:10 and 1:1 particles to asphalt; intumescable granules dispersed in the asphalt in an amount of at least about 5 volume-parts per 100 parts of asphalt; and iron- and halogen-containing material dispersed in the asphalt and which catalyzes the charring of asphalt upon heating of the asphalt to 175° C. or more.
Claim 3
Dependent Claim
13 words
Sheet material of claim 1 in which the fibrous webs comprise glass-fiber mats.
Claim 4
Dependent Claim
20 words
Sheet material of claim 1 or 2 in which the iron- and halogen-containing material is coated on the intumescable granules.
Claim 5
Dependent Claim
49 words
Sheet material of claim 1 in which the iron- and halogen-containing material comprises halogenated organic compound that releases halogen when heated to a temperature less than 175° C., and an iron-containing compound adapted to react with said released halogen to form iron halide, which catalyzes the charring of asphalt.
Claim 6
Dependent Claim
14 words
Sheet material of claim 4 in which the halogenated organic compound comprises chlorinated paraffin.
Claim 7
Dependent Claim
15 words
Sheet material of claim 4 or 5 in which the iron-containing compound comprises iron oxide.
Claim 8
Dependent Claim
24 words
Sheet material of claim 1 or 2 in which the inorganic filler particles are selected from calcium carbonate, titanium oxide, zirconium oxide, and clay.
Claim 9
Dependent Claim
14 words
Sheet material of claim 1 in which the intumescable granules comprise hydrated soluble silicate.
Claim 10
Dependent Claim
19 words
Sheet material of claim 1 in which the intumescable granules have been intumesced to yield an expanded insulative panel.
Claim 11
Dependent Claim
119 words
A fire- and heat-resistant sheet material comprising at least two glass-fiber webs; asphalt disposed between, impregnated in, and adhering the glass-fiber webs together; inorganic filler particles dispersed in the asphalt in a volume ratio between about 1:10 and 1:1 particles to asphalt; and intumescable granules comprising hydrated soluble silicate glass dispersed in the asphalt in an amount of at least 10 volume-parts per 100 parts of asphalt; said granules being coated with a halogenated organic compound that releases halogen when heated to a temperature less than 175° C., and an iron-containing compound adapted to react with said released halogen to form iron halide, which catalyzes the charring of asphalt upon heating of the asphalt to 175° C. or more.
Claim 12
Dependent Claim
119 words
A fire- and heat-resistant sheet material comprising at least two glass-fiber webs; asphalt disposed between, impregnated in, and adhering the glass-fiber webs together; inorganic filler particles dispersed in the asphalt in a volume ratio between about 1:10 and 1:1 particles to asphalt; and intumescable granules comprising hydrated soluble silicate glass dispersed in the asphalt in an amount of at least 10 volume-parts per 100 parts of asphalt; said granules being coated with a halogenated organic compound that releases halogen when heated to a temperature less than 175° C., and an iron-containing compound adapted to react with said released halogen to form iron halide, which catalyzes the charring of asphalt upon heating of the asphalt to 175° C. or more.
Claim 13
Dependent Claim
15 words
Sheet material of claim 10 in which the hydrated soluble silicate glass comprises sodium silicate.
Claim 14
Dependent Claim
14 words
Sheet material of claim 10 in which the halogenated organic compound comprises chlorinated paraffin.
Claim 15
Dependent Claim
15 words
Sheet material of claim 10 or 12 in which the iron-containing compound comprises iron oxide.
Claim 16
Dependent Claim
26 words
Sheet material of claim 10 in which the inorganic filler particles are included in an amount of at least 2 volume-parts per 10 parts of asphalt.
References Cited (Backward Citations)
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1986-02-07 | 1986-08-09 | 1987-02-08 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1990-02-07 | 1990-08-09 | 1991-02-08 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1994-02-07 | 1994-08-09 | 1995-02-08 | $7700.00 | Window Closed / Lapsed |