US4297253A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Method of making moldable product
Assignee: Individual
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Filing: 1979-08-20
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Granted: 1981-10-27
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Expires: 1999-08-20
Abstract
Abstract A product which can be molded to form a food container. The product is composed of lignin fibres or fibrils which are impregnated with a polymerizable resin, in one or more steps. The fibrils or fibres are formed in a homogeneous mass to permit molding the lignin product into an article under heat and pressure to polymerize the resin.
Inventors
- 👤 Pierre Sorbier
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 19:38
CPC Classifications
B; B27; B27N; B27N1/00; B27N1/02; B27N1/0209; C; C08; C08L; C08L97/00; C08L97/02
Claims Analysis
Total Claims: 10
Claim 1
Independent Claim
71 words
A process for manufacturing a moldable product composed of minute fibers of a ligneous material, said fibers having a length greater than their width, comprising the steps of: impregnating thin elongated slivers of the ligneous material with a polymerizable resin, then drying the slivers, then again impregnating the slivers with polymerizable resin, then again drying the slivers, and then homogenizing the slivers to reduce their size and form said minute fibers.
Claim 2
Dependent Claim
71 words
A process for manufacturing a moldable product composed of minute fibers of a ligneous material, said fibers having a length greater than their width, comprising the steps of: impregnating thin elongated slivers of the ligneous material with a polymerizable resin, then drying the slivers, then again impregnating the slivers with polymerizable resin, then again drying the slivers, and then homogenizing the slivers to reduce their size and form said minute fibers.
Claim 3
Dependent Claim
25 words
A process according to claim 1 wherein each step of impregnation comprises, spraying a solution of polymerizable resin on the slivers while mixing the slivers.
Claim 4
Dependent Claim
85 words
A process for manufacturing a moldable product containing fibers of a ligneous material comprising the steps of: impregnating the fibers with a polymerizable resin, then drying the fibers, then again impregnating the fibers with polymerizable resin and again drying the fibers, and then homogenizing the fibers, and wherein after the first step of impregnating, the fibers are dried to a moisture content of less than 10%, and after the second step of impregnating, the fibers are dried to a moisture content of less than 3%.
Claim 5
Dependent Claim
85 words
A process for manufacturing a moldable product containing fibers of a ligneous material comprising the steps of: impregnating the fibers with a polymerizable resin, then drying the fibers, then again impregnating the fibers with polymerizable resin and again drying the fibers, and then homogenizing the fibers, and wherein after the first step of impregnating, the fibers are dried to a moisture content of less than 10%, and after the second step of impregnating, the fibers are dried to a moisture content of less than 3%.
Claim 6
Dependent Claim
26 words
A process according to claim 1, 2 or 3 wherein said impregnating with a polymerizable resin comprises impregnating with an aqueous solution of soluble melamine resin.
Claim 7
Dependent Claim
33 words
A process according to claim 4 wherein the aqueous solution of soluble melamine resin further contains urea, in an amount equal to about 5% by weight of the melamine in the aqueous solution.
Claim 8
Dependent Claim
14 words
A process according to claim 5 wherein said aqueous solution further contains calcium carbonate.
Claim 9
Dependent Claim
16 words
A process according to claim 1, wherein said fibers are less than 8 mm in length.
Claim 10
Dependent Claim
16 words
A process according to claim 1, wherein said fibers are less than 0.5 mm in section.
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) | 1984-10-26 | 1985-04-27 | 1985-10-27 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1988-10-26 | 1989-04-27 | 1989-10-27 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1992-10-26 | 1993-04-27 | 1993-10-27 | $7700.00 | Window Closed / Lapsed |