US4063003A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Product and process for producing fire retardant cellulosic materials
Assignee: US PLYWOOD Corp A CORP OF
•
Filing: 1974-09-10
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Granted: 1977-12-13
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Expires: 1994-09-10
Abstract
Abstract A cellulosic substrate is rendered fire resistant through application thereto of an alcohol deactivated solution of chlorosulfonic acid and digested plant material.
Inventors
- 👤 Seymour Hartman
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-04 09:04
CPC Classifications
E; E04; E04B; E04B1/00; E04B1/62; E04B1/92; E04B1/94; C; C08; C08L; C08L97/00; C08L97/02; Y; Y10; Y10S; Y10S428/00; Y10S428/92; Y10S428/921; Y10T; Y10T428/00; Y10T428/31504; Y10T428/31971; Y10T428/31975; Y10T428/31978; Y10T428/31982; Y10T428/31989
Claims Analysis
Total Claims: 13
Claim 1
Independent Claim
42 words
A process for providing fire retardance to a cellulosic substrate comprising forming a solution by digesting plant material with chlorosulfonic acid, deactivating the resultant solution by decomposing the chlorosulfonic acid content thereof with alcohol and applying the deactivated solution to said substrate.
Claim 2
Dependent Claim
42 words
A process for providing fire retardance to a cellulosic substrate comprising forming a solution by digesting plant material with chlorosulfonic acid, deactivating the resultant solution by decomposing the chlorosulfonic acid content thereof with alcohol and applying the deactivated solution to said substrate.
Claim 3
Dependent Claim
18 words
The process of claim 1 wherein the substrate to which the deactivated solution has been applied is dried.
Claim 4
Dependent Claim
17 words
The process of claim 2 wherein the deactivated solution is filtered prior to application to the substrate.
Claim 5
Dependent Claim
17 words
The process of claim 1 wherein the plant material is dried prior to digestion with chlorosulfonic acid.
Claim 6
Dependent Claim
20 words
The process of claim 1 wherein from about 1 to 20% plant material by weight of chlorosulfonic acid is digested.
Claim 7
Dependent Claim
19 words
The process of claim 1 wherein from 4 to 12% plant material by weight of chlorosulfonic acid is digested.
Claim 8
Dependent Claim
20 words
The process of claim 2 wherein after drying of the applied solution, the substrate is provided with a protective coating.
Claim 9
Dependent Claim
11 words
The process of claim 1 wherein the cellulosic substrate comprises wood.
Claim 10
Dependent Claim
15 words
The process of claim 1 wherein the plant material digested with chlorosulfonic acid comprises wood.
Claim 11
Dependent Claim
9 words
The product produced by the process of claim 1.
Claim 12
Dependent Claim
9 words
The product produced by the process of claim 2.
Claim 13
Dependent Claim
9 words
The product produced by the process of claim 7.
References Cited (Backward Citations)
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US2559914A
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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) | 1980-12-12 | 1981-06-13 | 1981-12-13 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1984-12-12 | 1985-06-13 | 1985-12-13 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1988-12-12 | 1989-06-13 | 1989-12-13 | $7700.00 | Window Closed / Lapsed |