Patent US2211470A successfully refreshed from Google Patents.
Patent US3769116A successfully refreshed from Google Patents.
US3769116A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Method of making a building material from waste stock from a papermaking process
Assignee: Individual
•
Filing: 1971-11-15
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Granted: 1973-10-30
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Expires: 1991-11-15
Abstract
Abstract A method of making a building material, such as panel board, by utilizing waste stock from the papermaking industry. The major portion of the solids are separated from the waste stock by a settling treatment and the resulting effluent is subjected to floculation to separate the remaining solids. The solids are then blended together and additional cellulosic fibers and water, if necessary, are added to the mixture. The mixture is then passed through a papermaking machine to produce paper sheet and the paper sheets are subsequently laminated into a panel board, or other materials for the building industry.
Inventors
- 👤 C Champeau
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-31 10:43
CPC Classifications
D; D21; D21F; D21F1/00; D21F1/66; D21J; D21J1/00; D21J1/16; Y; Y10; Y10S; Y10S162/00; Y10S162/09
Claims Analysis
Total Claims: 9
Claim 1
Independent Claim
37 words
The method of claim 1, wherein said waste stock includes cooked ground wood waste resulting from screening paper stock after cooking, and waste stock extracted from a paper web during the forming operation in the papermaking process.
Claim 2
Dependent Claim
19 words
The method of claim 1, and including the step of adding additional cellulosic fiber material to the new stock.
Claim 3
Dependent Claim
13 words
The method of claim 3 wherein the additional cellulosic material is waste paper.
Claim 4
Dependent Claim
23 words
The method of claim 1, and including the step of applying a hardenable coating to the paper sheet prior to laminating the sheets.
Claim 5
Dependent Claim
21 words
The method of claim 1, wherein the sheets are laminated by applying an adhesive to the adjacent faces of the sheets.
Claim 6
Independent Claim
165 words
A method of preparing board from waste stock from a papermaking process, comprising the steps of supplying cooked, ground waste resulting from screening the paper stock after cooking to a settling tank, supplying waste stock extracted from the paper web during the forming operation in the papermaking process to said settling tank, separating a substantial portion of the solids from said waste stock in said settling tank, feeding said separated solids to a mixing tank, feeding the effluent from the settling tank to a floculation tank, separating the remaining portion of the solids from the effluent in the floculating tank, feeding said remaining portion of the solids from the floculating tank to said mixing tank, mixing said substantial portion of the solids with said remaining portion of the solids in the mixing tank to provide a new stock, feeding the new stock to a papermaking machine to form a paper sheet, and laminating a plurality of sheets together to form a board for building construction.
Claim 7
Dependent Claim
21 words
The method of claim 6, including the step of adding additional cellulosic fibers to the new stock in the mixing tank.
Claim 8
Dependent Claim
20 words
The method of claim 7, wherein said sheets are laminated by applying an adhesive to opposite faces of said sheets.
Claim 9
Dependent Claim
35 words
The method of claim 7, and including the step of applying a coating of a fast drying hardening agent to opposite faces of the paper sheet prior to laminating the sheet, and drying said coating.
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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) | 1976-10-29 | 1977-04-30 | 1977-10-30 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1980-10-29 | 1981-04-30 | 1981-10-30 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1984-10-29 | 1985-04-30 | 1985-10-30 | $7700.00 | Window Closed / Lapsed |