US3836336A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Apparatus for continuous xanthation and solution of alkali cellulose
Assignee: Asahi Kasei Corp
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Filing: 1971-11-11
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Granted: 1974-09-17
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Expires: 1991-11-11
Abstract
Abstract This invention relates to an apparatus for xanthate-formation from alkali cellulose, carbon bisulfide and aqueous alkali solution. The apparatus is characterized by two kneaders connected one to the other. The first kneader is characterized by having a kneading rotor rotatably and reciprocatably mounted. The second kneader is characterized by having a rotor fitted with kneading pins studded thereon and inside cooling means.
Inventors
- 👤 K Yasui
- 👤 K Yamamoto
- 👤 K Itami
- 👤 K Fujisawa
- 👤 T Sasaki
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-02 17:51
CPC Classifications
C; C08; C08B; C08B9/00; C08B9/04; B; B01; B01F; B01F21/00; B01F21/10; B01F21/20; B01F33/00; B01F33/80; B01F33/82; B01F33/821; D; D01; D01F; D01F2/00; D01F2/06; D01F2/08
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
32 words
The machine of claim 1 wherein said first and second sets of kneadinG pins of said second kneader are arranged radially and longitudinally in rows so as to cooperate with one another.
Claim 2
Dependent Claim
57 words
The machine of claim 1 including a third kneader connected in series with said second kneader, said third kneader being of the pin-to-pin kneading type for providing a liquid shearing effect upon the treating mixture and being fitted with an inlet for introducing water or aqueous alkali solution for diluting the received paste into a spinnable viscose.
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) | 1977-09-16 | 1978-03-18 | 1978-09-17 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1981-09-16 | 1982-03-18 | 1982-09-17 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1985-09-16 | 1986-03-18 | 1986-09-17 | $7700.00 | Window Closed / Lapsed |