Patent US2840550A successfully refreshed from Google Patents.
US2840550A
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Process for polymerizing vinyl compounds containing a basic nitrogen atom
Assignee: Wyeth Holdings LLC
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Filing: 1955-05-20
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Granted: 1958-06-24
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Expires: 1975-05-20
Abstract
No abstract record available.
Inventors
- 👤 John A Price
- 👤 Walter M Thomas
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-26 19:40
CPC Classifications
C; C08; C08F; C08F220/00; C08F220/02; C08F220/42; C08F2/00; C08F2/04; C08F2/10; C08F20/00; C08F20/62; C08F220/44; C08F26/00
Claims Analysis
Total Claims: 3
Claim 1
Independent Claim
91 words
A PROCESS WHICH COMPRISES POLYMERIZING A MAJOR PROPORTION OF ACRYLONITRILE AND A MINOR PROPORTION OF A VINYL PYRIDINE AT A TEMPERATURE BETWEEN ABOUT 20 AND ABOUT 70 DEGREES CENTIGRADE IN AN AQUEOUS SOLUTION COMPRISING BETWEEN ABOUT 0.01 AND ABOUT 1.0 PERCENT OF CHLORATE IONS FROM AN ALKALI METAL CHLORATE, BETWEEN ABOUT 0.01 AND ABOUT 3.0 PERCENT OF SULFOXY IONS FROM AN ALKALI METAL SALT OF SULFUROUS ACID BASED UPON THE WEIGHT OF POLYMERIZABLE MATERIAL AND SUFFICIENT NITRIC ACID TO PRODUCE A PH BETWEEN ABOUT 1 AND ABOUT 5 IN THE SOLUTION.
Claim 2
Dependent Claim
91 words
A PROCESS WHICH COMPRISES POLYMERIZING A MAJOR PROPORTION OF ACRYLONITRILE AND A MINOR PROPORTION OF A VINYL PYRIDINE AT A TEMPERATURE BETWEEN ABOUT 20 AND ABOUT 70 DEGREES CENTIGRADE IN AN AQUEOUS SOLUTION COMPRISING BETWEEN ABOUT 0.01 AND ABOUT 1.0 PERCENT OF CHLORATE IONS FROM AN ALKALI METAL CHLORATE, BETWEEN ABOUT 0.01 AND ABOUT 3.0 PERCENT OF SULFOXY IONS FROM AN ALKALI METAL SALT OF SULFUROUS ACID BASED UPON THE WEIGHT OF POLYMERIZABLE MATERIAL AND SUFFICIENT NITRIC ACID TO PRODUCE A PH BETWEEN ABOUT 1 AND ABOUT 5 IN THE SOLUTION.
Claim 3
Dependent Claim
39 words
A PROCESS ACCORDING TO CLAIM 10 IN WHICH THE POLYMERIZABLE MATERIAL CHARGED COMPRISES ABOUT 80 TO ABOUT 90 PERCENT BY WEIGHT OF ACRYLONITRILE, ABOUT 5 TO ABOUT 10 PERCENT 2-METHYL-5-VINYL PYRIDINE AND ABOUT 5 TO 10 PERCENT VINYL ACETATE.
References Cited (Backward Citations)
US2673192A
Cited
US2648647A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1961-06-23 | 1961-12-23 | 1962-06-24 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1965-06-23 | 1965-12-23 | 1966-06-24 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1969-06-23 | 1969-12-23 | 1970-06-24 | $7700.00 | Window Closed / Lapsed |