US3624009A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Method for reclaiming commercially useful fibers and resin from scrap material
Assignee: FIBER PROCESS Inc
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Filing: 1969-11-04
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Granted: 1971-11-30
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Expires: 1989-11-04
Abstract
Abstract Scrap fabrics supported synthetic resin are first washed with solvent under controlled heat, pressure and agitation to produce as a first product clean, dried, resin and solvent free fibers. The polymer solution extracted from the washing stage is treated in one or more stages to produce as a second product granular, clean, dried resin compound. Clean solvent is recovered for recirculation through the system.
Inventors
- 👤 Wilbur B Sussman
- 👤 Craig D Belcher
- 👤 George E Brown Jr
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-01 20:00
CPC Classifications
C; C08; C08J; C08J11/00; C08J11/04; C08J11/06; C08J11/08; Y; Y02; Y02W; Y02W30/00; Y02W30/50; Y02W30/62
Claims Analysis
Total Claims: 9
Claim 1
Independent Claim
77 words
The method claim in claim 1 wherein said step of treating said scrap material is accomplished in a plurality of stages with a quantity of solvent introduced at the beginning of each stage and withdrawn at the end of each stage, the first stage utilizing a solvent solution containing not more than about 10 percent PVC, each subsequent stage utilizing a solvent solution containing less PVC than the preceding stage, the final stage utilizing substantially pure solvent.
Claim 2
Dependent Claim
34 words
The method claimed in claim 2, wherein the solvent utilized in each stage subsequent to said first stage is withdrawn and utilized without further treatment in the immediately preceding stage in a subsequent operation.
Claim 3
Dependent Claim
24 words
The method claimed in claim 1 including the step of drying said scrap material prior to treating it with solvent to remove residual moisture.
Claim 4
Dependent Claim
26 words
The method claimed in claim 1 including the step of cutting said scrap material to pieces of a size not larger than about 8 square inches.
Claim 5
Dependent Claim
11 words
The method claimed in claim 1 wherein said solvent is tetrahydrafuran.
Claim 6
Dependent Claim
29 words
The method claimed in claim 1 wherein said step of continuously evaporating the remainder of said solvent from said solvent and PVC solution is accomplished in a partial vacuum.
Claim 7
Dependent Claim
18 words
The method claimed in claim 7 wherein the temperature in said partial vacuum is less than 180* F.
Claim 8
Dependent Claim
21 words
The method claimed in claim 1 wherein said process is carried out in a closed system purged with an inert gas.
Claim 9
Dependent Claim
30 words
The method claimed in claim 1 including the step of mixing bentonitic clay with said solvent for adsorbing die and pigment released from the scrap material during the agitation period.
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) | 1974-11-29 | 1975-05-31 | 1975-11-30 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1978-11-29 | 1979-05-31 | 1979-11-30 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1982-11-29 | 1983-05-31 | 1983-11-30 | $7700.00 | Window Closed / Lapsed |