US5347780A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Gypsum fiberboard door frame
Assignee: Georgia Pacific Gypsum LLC
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Filing: 1992-08-20
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Granted: 1994-09-20
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Expires: 2012-08-20
Abstract
Abstract A door frame having excellent fire-resistance, flexural strength and screw holding properties is fabricated from gypsum fiberboard, specifically a gypsum fiberboard having a density of at least 60 lbs./cu.ft., a flexural strength of at least about 30 lbs. (1/2'' thick material), and a screw holding capability of at least about 400 lbs. A preferred gypsum fiberboard material for fabrication of the door frame comprises a composition containing a substantially uniform dispersion of solids including by weight about 65% to 90% set gypsum, about 7% to about 30% pulped paper, up to about 9% binder, and about 0.8% to 2% inorganic fiber. A wood veneer is preferably applied to the visible faces of the gypsum fiberboard door frame members.
Inventors
- 👤 Turner W. Richards
- 👤 Hubert C. Francis
- 👤 George F. Fowler, Jr.
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-04 20:08
CPC Classifications
E; E06; E06B; E06B5/00; E06B5/10; E06B5/16; E06B5/161; B; B28; B28B; B28B1/00; B28B1/52; B28B1/525; B28B1/526; B28B19/00; B28B19/0092; B28B5/00; B28B5/02; B28B5/026; B28B5/027; B32; B32B; B32B13/00; B32B13/04; C; C04; C04B; C04B28/00; C04B28/14; E06B1/00; E06B1/04; E06B1/32; C04B2111/00; C04B2111/00034; C04B2111/00068; C04B2111/10; C04B2111/12; C04B2111/20; C04B2111/28; Y; Y02; Y02W; Y02W30/00; Y02W30/50; Y02W30/91
Claims Analysis
Total Claims: 13
Claim 1
Independent Claim
68 words
A fire-resistant door frame comprising a pair of spaced vertical gypsum fiberboard side jambs connected at their upper ends by a horizontal gypsum fiberboard head jamb, said gypsum fiberboard jambs each comprising at least about 65 wt. % set gypsum dihydrate and at least about 7 wt. % reinforcing fibers substantially uniformly distributed therethrough, said gypsum fiberboard jambs having a screw-holding capacity of at least about 400 lbs.
Claim 2
Dependent Claim
68 words
A fire-resistant door frame comprising a pair of spaced vertical gypsum fiberboard side jambs connected at their upper ends by a horizontal gypsum fiberboard head jamb, said gypsum fiberboard jambs each comprising at least about 65 wt. % set gypsum dihydrate and at least about 7 wt. % reinforcing fibers substantially uniformly distributed therethrough, said gypsum fiberboard jambs having a screw-holding capacity of at least about 400 lbs.
Claim 3
Dependent Claim
27 words
The invention as claimed in claim 1, wherein said gypsum fiberboard side jambs and head jamb comprise a composition having a density of at least 60 lbs./cu.ft.
Claim 4
Dependent Claim
29 words
The invention as claimed in claim 1, wherein said gypsum fiberboard side jambs and head jamb have a flexural strength of at least about 30 lbs. (1/2" thick material).
Claim 5
Dependent Claim
56 words
The invention as claimed in claim 1, wherein said gypsum fiberboard side jambs and head jamb comprise a composition containing a substantially uniform dispersion of solids including by weight about 65% to about 90% set gypsum, about 7% to about 30% pulped paper, up to about 9% binder, and about 0.8% to about 2% inorganic fiber.
Claim 6
Dependent Claim
44 words
The invention as claimed in claim 1, wherein said gypsum fiberboard side jambs and head jamb comprise a composition containing a substantially uniform dispersion of solids including by weight about 65% to about 90% set gypsum and about 7% to about 30% reinforcing fibers.
Claim 7
Dependent Claim
14 words
The invention as claimed in claim 5, wherein said reinforcing fibers comprise pulped paper.
Claim 8
Dependent Claim
90 words
A fiber-resistant door frame comprising a pair of spaced vertical gypsum fiberboard side jambs connected at their upper ends by a horizontal gypsum fiberboard head jamb, said gypsum fiberboard jambs each comprising a composition including at least about 65 wt. % set gypsum dihydrate and at least about 7 wt. % reinforcing fibers substantially uniformly distributed therethrough, said composition having a density of at least 60 lbs./cu.ft., a screw holding capacity of at least about 700 lbs. and a flexural strength of at least about 30 lbs. (1/2" thick material).
Claim 9
Dependent Claim
90 words
A fiber-resistant door frame comprising a pair of spaced vertical gypsum fiberboard side jambs connected at their upper ends by a horizontal gypsum fiberboard head jamb, said gypsum fiberboard jambs each comprising a composition including at least about 65 wt. % set gypsum dihydrate and at least about 7 wt. % reinforcing fibers substantially uniformly distributed therethrough, said composition having a density of at least 60 lbs./cu.ft., a screw holding capacity of at least about 700 lbs. and a flexural strength of at least about 30 lbs. (1/2" thick material).
Claim 10
Dependent Claim
35 words
The invention as claimed in claim 7, wherein said composition contains a substantially uniform dispersion of solids including by weight about 65% to about 90% set gypsum and about 7% to about 30% pulped paper.
Claim 11
Dependent Claim
45 words
The invention as claimed in claim 7, wherein said composition contains a substantially uniform dispersion of solids including by weight about 75% to about 90% set, about 7% to about 30% pulped paper, about 9% binder polymer, and about 0.8% to about 2% inorganic fiber.
Claim 12
Dependent Claim
23 words
The invention as claimed in claim 7, wherein said jambs each include a stop molding of gypsum fiberboard on the inner face thereof.
Claim 13
Dependent Claim
20 words
The invention as claimed in claim 7, wherein the exposed faces of said jambs are covered with a wood veneer.
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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) | 1997-09-19 | 1998-03-21 | 1998-09-20 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 2001-09-19 | 2002-03-21 | 2002-09-20 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2005-09-19 | 2006-03-21 | 2006-09-20 | $7700.00 | Window Closed / Lapsed |