US4040949A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Method for separation of mixture of polyester and cellulose derivative
Assignee: Mitsui Kinzoku Co Ltd
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Filing: 1975-09-10
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Granted: 1977-08-09
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Expires: 1995-09-10
Abstract
Abstract A method for the separation of a mixture of a polyester and a cellulose derivative comprising introducing gas bubbles into an aqueous liquid medium containing the mixture of the polyester and the cellulose derivative, optionally in the presence of at least one wetting agent and at least one flotation agent thereby separating the mixture by flotation into the polyester and the cellulose derivative.
Inventors
- 👤 Kozo Saitoh
- 👤 Sumio Izumi
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-31 16:24
CPC Classifications
B; B03; B03D; B03D1/00; B03D1/02; B29; B29B; B29B17/00; B29B17/02; B29B2017/0213; B29B2017/0217; B29B2017/0248; B29K; B29K2023/00; B29K2023/10; B29K2023/12; B29K2033/00; B29K2033/04; B29K2033/12; B29K2067/00; B29K2711/00; B29K2711/12; Y; Y02; Y02W; Y02W30/00; Y02W30/50; Y02W30/62
Claims Analysis
Total Claims: 4
Claim 1
Independent Claim
80 words
A method for the separation of a mixture of a polyester and a cellulose plastic derivative selected from the group consisting of cellulose diacetate, cellulose triacetate and nitrocellulose consisting of introducing gas bubbles into a dispersion of a mixture of said polyester and said cellulose derivative, said polyester and said cellulose derivative being solid pieces having a size of 1 to 50 mm, in an aqueous liquid medium, thereby floating said polyester from separating said polyester and said cellulose derivative.
Claim 2
Independent Claim
80 words
A method for the separation of a mixture of a polyester and a cellulose plastic derivative selected from the group consisting of cellulose diacetate, cellulose triacetate and nitrocellulose consisting of introducing gas bubbles into a dispersion of a mixture of said polyester and said cellulose derivative, said polyester and said cellulose derivative being solid pieces having a size of 1 to 50 mm, in an aqueous liquid medium, thereby floating said polyester from separating said polyester and said cellulose derivative.
Claim 3
Dependent Claim
34 words
The method as claimed in claim 1, wherein said mixture is present in an amount of about 0.1 to about 10 parts by weight per 100 parts by weight of said aqueous liquid medium.
Claim 4
Dependent Claim
17 words
The method as claimed in claim 1, wherein said aqueous liquid medium is water or salt water.
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) | 1980-08-08 | 1981-02-07 | 1981-08-09 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1984-08-08 | 1985-02-07 | 1985-08-09 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1988-08-08 | 1989-02-07 | 1989-08-09 | $7700.00 | Window Closed / Lapsed |