US4128699A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Treated gypsum wallboard paper
Assignee: National Gypsum Co
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Filing: 1977-10-03
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Granted: 1978-12-05
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Expires: 1997-10-03
Abstract
Abstract Drying oils are used to improve strength and durability characteristics of gypsum wallboard paper with many unexpected additional advantages. Applied before board manufacture, critical porosity characteristics are left uninterrupted. Applied after board manufacture, shear strengths are obtained beyond expectations.
Inventors
- 👤 Donald R. Kole
- 👤 Donald A. Kossuth
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-05 14:44
CPC Classifications
B; B32; B32B; B32B13/00; B32B13/04; B32B13/08; D; D21; D21H; D21H27/00; D21H27/18; D21H27/22; E; E04; E04C; E04C2/00; E04C2/02; E04C2/04; E04C2/043; B32B2260/00; B32B2260/02; B32B2260/028; B32B2262/00; B32B2262/06; B32B2262/062; B32B2305/00; B32B2305/02; B32B2305/026; B32B2607/00; D21H17/00; D21H17/02; D21H17/20; D21H17/33; D21H17/34; D21H17/38; D21H17/46; D21H17/47; D21H17/48; Y; Y10; Y10T; Y10T428/00; Y10T428/31504; Y10T428/31844; Y10T428/31848
Claims Analysis
Total Claims: 12
Claim 1
Independent Claim
66 words
The method of making an improved porous paper comprising the steps of mixing a drying oil and a thinner for decreasing the viscosity, impregnating the paper with said mixture, drying off the thinner portion of said mixture and curing said drying oil to form a porous paper formed of substantially unchanged fibrous form with said fibers being individually covered and impregnated with said cured drying oil.
Claim 2
Independent Claim
66 words
The method of making an improved porous paper comprising the steps of mixing a drying oil and a thinner for decreasing the viscosity, impregnating the paper with said mixture, drying off the thinner portion of said mixture and curing said drying oil to form a porous paper formed of substantially unchanged fibrous form with said fibers being individually covered and impregnated with said cured drying oil.
Claim 3
Dependent Claim
19 words
The method of claim 1 wherein said drying oil is further modified by the addition of a resin thereto.
Claim 4
Dependent Claim
16 words
The method of claim 1 wherein said mixture is an emulsion of drying oil in water.
Claim 5
Dependent Claim
81 words
The method of making paper-covered gypsum wallboard comprising the steps of making an improved porous paper as defined in claim 1, disposing an aqueous slurry of settable gypsum into a board form between two paper cover sheets at least one of which is said improved porous paper, allowing said settable gypsum to form a set gypsum core and drying said set gypsum board at temperatures causing the excess water in said core to pass through both of said paper cover sheets.
Claim 6
Dependent Claim
19 words
The method of claim 4 wherein said drying oil is further modified by the addition of a resin thereto.
Claim 7
Dependent Claim
11 words
The method of claim 5 wherein said resin is an alkyd.
Claim 8
Dependent Claim
33 words
An improved gypsum wallboard porous paper having cellulose fibers substantially all of which to a depth of at least about 10% of the thickness of the paper are impregnated with a drying oil.
Claim 9
Dependent Claim
33 words
An improved gypsum wallboard porous paper having cellulose fibers substantially all of which to a depth of at least about 10% of the thickness of the paper are impregnated with a drying oil.
Claim 10
Dependent Claim
20 words
Paper as defined in claim 7 having a porosity which is substantially unaffected by the presence of said drying oil.
Claim 11
Dependent Claim
30 words
Gypsum wallboard comprising a set gypsum core disposed between a face paper and a back paper, at least one of said papers having a structure as defined in claim 7.
Claim 12
Dependent Claim
16 words
Gypsum wallboard as defined in claim 9 wherein said drying oil is modified by a resin.
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) | 1981-12-04 | 1982-06-05 | 1982-12-05 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1985-12-04 | 1986-06-05 | 1986-12-05 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1989-12-04 | 1990-06-05 | 1990-12-05 | $7700.00 | Window Closed / Lapsed |