US3987600A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Fire resistant doors
Assignee: United States Gypsum Co
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Filing: 1975-12-10
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Granted: 1976-10-26
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Expires: 1995-12-10
Abstract
Abstract Fire-resisting doors having a novel framing, that is the stiles and rails of the door, are disclosed. The door comprises preferably a thermal insulating core and conventional outer facing cover sheets and is framed with a particular combination of glass fibers and gypsum in a particular arrangement.
Inventors
- 👤 Donald O. Baehr
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-01 16:43
CPC Classifications
E; E06; E06B; E06B5/00; E06B5/10; E06B5/16; E06B3/00; E06B3/70; E06B2003/7059; Y; Y10; Y10S; Y10S428/00; Y10S428/92; Y10T; Y10T428/00; Y10T428/24; Y10T428/24174; Y10T428/249921; Y10T428/249953; Y10T428/249967; Y10T428/249968
Claims Analysis
Total Claims: 12
Claim 1
Independent Claim
76 words
A fire resisting door comprising a framework of stiles and rails, a core of thermally insulating material within the framework, and at least one outer facing sheet covering the core and framework; the improvement comprising said stiles and rails of said framework containing a gypsum matrix reinforced with layers of (a) a plurality of continuous glass fiber rovings set parallel to the length of the framework, and (b) alternating spaced apart layerings of glass fiber mat.
Claim 2
Dependent Claim
76 words
A fire resisting door comprising a framework of stiles and rails, a core of thermally insulating material within the framework, and at least one outer facing sheet covering the core and framework; the improvement comprising said stiles and rails of said framework containing a gypsum matrix reinforced with layers of (a) a plurality of continuous glass fiber rovings set parallel to the length of the framework, and (b) alternating spaced apart layerings of glass fiber mat.
Claim 3
Dependent Claim
15 words
A fire resisting door according to claim 1, wherein said mat is a non-woven mat.
Claim 4
Dependent Claim
15 words
A fire resisting door according to claim 1, wherein said mat is a woven mat.
Claim 5
Dependent Claim
16 words
A fire resisting door according to claim 1, wherein said gypsum is a low consistency gypsum.
Claim 6
Dependent Claim
14 words
A fire resisting door according to claim 1, wherein said gypsum is alpha gypsum.
Claim 7
Dependent Claim
16 words
A fire resisting door according to claim 1, wherein said facing sheet is composed of metal.
Claim 8
Dependent Claim
56 words
A framework for holding a door core and at least one outer facing sheet, said framework comprising stiles and rails containing a gypsum matrix reinforced with layers of (a) a plurality of continuous glass fiber rovings set parallel to the length of the stiles and rails and (b) alternating spaced apart layerings of glass fiber mat.
Claim 9
Dependent Claim
56 words
A framework for holding a door core and at least one outer facing sheet, said framework comprising stiles and rails containing a gypsum matrix reinforced with layers of (a) a plurality of continuous glass fiber rovings set parallel to the length of the stiles and rails and (b) alternating spaced apart layerings of glass fiber mat.
Claim 10
Dependent Claim
14 words
A framework according to claim 7, wherein said gypsum is a low consistency gypsum.
Claim 11
Dependent Claim
12 words
A framework according to claim 7, wherein said gypsum is alpha gypsum.
Claim 12
Dependent Claim
16 words
A framework according to claim 7, wherein said rovings and said mat are of inorganic fiber.
References Cited (Backward Citations)
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Cited
GB728984A
Cited
US3185297A
Cited
US3299595A
Cited
US3225505A
Cited
US3311516A
Cited
US3864201A
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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) | 1979-10-26 | 1980-04-26 | 1980-10-26 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1983-10-26 | 1984-04-26 | 1984-10-26 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1987-10-26 | 1988-04-26 | 1988-10-26 | $7700.00 | Window Closed / Lapsed |