US4303019A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Articles molded from papermill sludge
Assignee: Michigan Technological University
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Filing: 1980-02-07
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Granted: 1981-12-01
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Expires: 2000-02-07
Abstract
Abstract An article, such as a pallet having a substantially flat deck member and a plurality of hollow legs projecting from the deck member, is molded as a one-piece unit from a papermill sludge. Dried, comminuted papermill sludge is blended with a fibrous reinforcing material, preferably a cellulosic material such as fibrous bark particles, and a resinous particle board binder, the resulting mixture of furnish is formed into a loosely fitted mat, and the mat is placed between dyes of a mold and press and compressed to substantially the desired shape under temperature and pressure conditions sufficient to bond the sludge and bark particles together.
Inventors
- 👤 Bruce A. Haataja
- 👤 Anders E. Lund
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-04 19:09
CPC Classifications
B; B27; B27N; B27N5/00; B65; B65D; B65D19/00; B65D19/0004; B65D19/0006; B65D19/0008; B65D19/001; B65D19/0014; B65D19/0018; B65D2519/00; B65D2519/00004; B65D2519/00009; B65D2519/00014; B65D2519/00019; B65D2519/00039; B65D2519/00049; B65D2519/00054; B65D2519/00074; B65D2519/00258; B65D2519/00263; B65D2519/00268; B65D2519/00283; B65D2519/00288; B65D2519/00313; B65D2519/00318; B65D2519/00328; B65D2519/00338; Y; Y10; Y10S; Y10S108/00; Y10S108/901; Y10S162/00; Y10S162/09
Claims Analysis
Total Claims: 9
Claim 1
Independent Claim
78 words
An article having a major plane and integral non-planar portions displaced from said major plane compression molded from a mixture including about 25 to about 75 weight % of a comminuted papermill sludge containing about 20 weight % or less moisture, about 25 to about 75 weight % of a fibrous, cellulosic, reinforcing material and a resinous particle board binder, said weight percentages being based on the total dry weight of the papermill sludge and the cellulosic material.
Claim 2
Dependent Claim
78 words
An article having a major plane and integral non-planar portions displaced from said major plane compression molded from a mixture including about 25 to about 75 weight % of a comminuted papermill sludge containing about 20 weight % or less moisture, about 25 to about 75 weight % of a fibrous, cellulosic, reinforcing material and a resinous particle board binder, said weight percentages being based on the total dry weight of the papermill sludge and the cellulosic material.
Claim 3
Dependent Claim
13 words
An article according to claim 1 wherein said cellulosic material is bark particles.
Claim 4
Dependent Claim
35 words
An article according to claim 2 wherein said mixture contains about 2 to about 15 weight % of said binder, as solids based on the total dry weight of the papermill sludge and bark particles.
Claim 5
Dependent Claim
66 words
An article according to claim 3 comprising a one-piece pallet including deck member having a major plane; and a plurality of hollow legs projecting integrally from said deck member, each of said leg members having a bottom wall spaced from said deck member and side walls integrally connecting said bottom wall with said deck member and inclining outwardly from said bottom wall towards said deck member.
Claim 6
Dependent Claim
21 words
An article according to claim 2 wherein the moisture content of said bark particles is about 20 weight % or less.
Claim 7
Dependent Claim
38 words
An article according to claim 5 wherein the moisture content of said papermill sludge is about 4 to about 10 weight % and the moisture content of said bark particles is about 4 to about 10 weight %.
Claim 8
Dependent Claim
25 words
An article according to claim 1 wherein the amounts of both the papermill sludge and the cellulosic material is about 40 to 60 weight %.
Claim 9
Dependent Claim
13 words
An article according to claim 7 wherein said cellulosic material is bark particles.
References Cited (Backward Citations)
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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) | 1984-11-30 | 1985-06-01 | 1985-12-01 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1988-11-30 | 1989-06-01 | 1989-12-01 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1992-11-30 | 1993-06-01 | 1993-12-01 | $7700.00 | Window Closed / Lapsed |