US4240839A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Thermal insulation material
Assignee: Lockheed Martin Corp
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Filing: 1979-06-28
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Granted: 1980-12-23
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Expires: 1999-06-28
Abstract
Abstract An improved material particularly suited for the thermal insulation of building structures such as residential housing. The material comprises an inorganic, low-density cellular thermally insulating foam comprising a gypsum matrix having minute cavities homogeneously distributed therein. The material has a dry density of less than about 3 pounds per cubic foot and a thermal coefficient of less than about 0.37.
Inventors
- 👤 Charles E. Crepeau
- 👤 Robert F. Mulvey
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-02 07:20
CPC Classifications
C; C04; C04B; C04B28/00; C04B28/14; E; E04; E04C; E04C2/00; E04C2/02; E04C2/04; E04C2/049
Claims Analysis
Total Claims: 12
Claim 1
Independent Claim
65 words
A thermally insulating composite assembly, comprising generally at least one structural surface element and a low density cellular gypsum material positioned adjacent to said surface element, said cellular gypsum material comprising a gypsum matrix having minute cavities homogeneously distributed therein, said gypsum material having a dry density of less than about 3 pounds per cubic foot and a thermal coefficient of less than about 0.37.
Claim 2
Dependent Claim
65 words
A thermally insulating composite assembly, comprising generally at least one structural surface element and a low density cellular gypsum material positioned adjacent to said surface element, said cellular gypsum material comprising a gypsum matrix having minute cavities homogeneously distributed therein, said gypsum material having a dry density of less than about 3 pounds per cubic foot and a thermal coefficient of less than about 0.37.
Claim 3
Dependent Claim
24 words
A composite assembly according to claim 1, wherein said gypsum material has a dry density of more than about 0.8 pounds per cubic foot.
Claim 4
Dependent Claim
27 words
A composite assembly according to claim 2, wherein said gypsum matrix includes at least approximately 0.25% by weight of fibrous material dispersed homogeneously throughout said gypsum matrix.
Claim 5
Dependent Claim
23 words
A composite assembly according to claim 3, wherein said fibrous material is comprised of approximately 0.25 to 7% by weight of chopped glass.
Claim 6
Dependent Claim
36 words
A composite assembly according to claim 1, further comprising at least first and second joists positioned adjacent to said one structural element for containing said gypsum material therebetween, whereby to form a thermally insulated ceiling structure.
Claim 7
Dependent Claim
35 words
A composite assembly according to claim 1, further comprising a second structural element spaced parallel to said one structural element to hold said gypsum material therebetween, whereby to form a thermally insulated composite wall assembly.
Claim 8
Dependent Claim
43 words
A low density cellular thermally insulating gypsum material comprising a gypsum matrix having minute cavities homogeneously distributed therein, said gypsum material having a dry density of less than about 3 pounds per cubic foot and a thermal coefficient of less than about 0.37.
Claim 9
Dependent Claim
43 words
A low density cellular thermally insulating gypsum material comprising a gypsum matrix having minute cavities homogeneously distributed therein, said gypsum material having a dry density of less than about 3 pounds per cubic foot and a thermal coefficient of less than about 0.37.
Claim 10
Dependent Claim
29 words
A low density cellular thermally insulating gypsum material according to claim 7, wherein said gypsum material has a dry density of more than about 0.8 pounds per cubic foot.
Claim 11
Dependent Claim
33 words
A low density cellular thermally insulating gypsum material according to claim 8, wherein said gypsum matrix includes at least approximately 0.25 percent by weight of fibrous material dispersed homogeneously throughout said gypsum matrix.
Claim 12
Dependent Claim
29 words
A low density cellular thermally insulating gypsum material according to claim 9, where said fibrous material is comprised of approximately 0.25 to 7 percent by weight of chopped glass.
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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) | 1983-12-23 | 1984-06-23 | 1984-12-23 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1987-12-23 | 1988-06-23 | 1988-12-23 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1991-12-23 | 1992-06-23 | 1992-12-23 | $7700.00 | Window Closed / Lapsed |