US2769804A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Continuous method for making solid polymeric materials
Assignee: Dow Chemical Co
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Filing: 1951-09-10
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Granted: 1956-11-06
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Expires: 1971-09-10
Abstract
No abstract record available.
Inventors
- 👤 Alden W Hanson
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-25 20:27
CPC Classifications
B; B01; B01J; B01J19/00; B01J19/18; B01J19/1812; B01J19/1837; B01J19/1862; B01J19/1868; B01J19/1881; B01J19/20; C; C08; C08F; C08F2/00; C08F2/02; C08F2/36; B01J2219/00; B01J2219/00002; B01J2219/00027; B01J2219/00029; B01J2219/00049; B01J2219/00051; B01J2219/00074; B01J2219/00087; B01J2219/00094; Y; Y10; Y10S; Y10S526/00; Y10S526/918
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
125 words
A METHOD FOR THE COPOLYMERIZATION OF VINYLIDENE COMPOUNDS IN A CONTINUOUS MANNER WHICH COMPRISES FEEDING AT LEAST TWO COPOLYMERIZABLE LIQUID MONOMERIC VINYLIDENE COMPOUNDS TO A POLYMERIZATION ZONE WHERE THE RESULTING MIXTURE IS AGITATED AT A POLYMERIZATION TEMPERATURE WITH RESULTANT FORMATION OF A MIXTURE COPOLYMERIC MATERIAL AND UNREACTED MONOMERIC MATERIAL, WITHDRAWING A STREAM OF THE INCOMPLETELY POLYMERIZED MIXTURE FROM SAID ZONE, VAPORIZING THE UNREACTED MONOMERIC MATERIAL FROM THE STREAM AND RETURINING IT, WITHIN THE POLYMERIZATION SYSTEM, TO THE POLYMERIZATION ZONE, AND DISCHARGING THE RESIDUAL COPOLYMERIC MATERIAL FROM THE POLYMERIZATION SYSTEM AT A RATE CORRESPONDING APPROXIMATELY, ON A WEIGHT BASIS, TO THE RATE OF MONOMER FED TO THE SYSTEM AND, WHILE CONTINUING SAID OPERATIONS, MAINTAINING THE MIXTURE AT EACH POINT WITHIN THE POLYMERIZATION ZONE AT A SUBSTAN-
Claim 2
Independent Claim
125 words
A METHOD FOR THE COPOLYMERIZATION OF VINYLIDENE COMPOUNDS IN A CONTINUOUS MANNER WHICH COMPRISES FEEDING AT LEAST TWO COPOLYMERIZABLE LIQUID MONOMERIC VINYLIDENE COMPOUNDS TO A POLYMERIZATION ZONE WHERE THE RESULTING MIXTURE IS AGITATED AT A POLYMERIZATION TEMPERATURE WITH RESULTANT FORMATION OF A MIXTURE COPOLYMERIC MATERIAL AND UNREACTED MONOMERIC MATERIAL, WITHDRAWING A STREAM OF THE INCOMPLETELY POLYMERIZED MIXTURE FROM SAID ZONE, VAPORIZING THE UNREACTED MONOMERIC MATERIAL FROM THE STREAM AND RETURINING IT, WITHIN THE POLYMERIZATION SYSTEM, TO THE POLYMERIZATION ZONE, AND DISCHARGING THE RESIDUAL COPOLYMERIC MATERIAL FROM THE POLYMERIZATION SYSTEM AT A RATE CORRESPONDING APPROXIMATELY, ON A WEIGHT BASIS, TO THE RATE OF MONOMER FED TO THE SYSTEM AND, WHILE CONTINUING SAID OPERATIONS, MAINTAINING THE MIXTURE AT EACH POINT WITHIN THE POLYMERIZATION ZONE AT A SUBSTAN-
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) | 1959-11-06 | 1960-05-07 | 1960-11-06 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1963-11-06 | 1964-05-07 | 1964-11-06 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1967-11-06 | 1968-05-07 | 1968-11-06 | $7700.00 | Window Closed / Lapsed |