US3271334A
Expired / Lapsed
US
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Process for the production of crosslinked compound polymers of polyacrolein
Assignee: Evonik Operations GmbH
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Filing: 1963-09-04
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Granted: 1966-09-06
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Expires: 1983-09-04
Abstract
No abstract record available.
Inventors
- 👤 Kern Werner
- 👤 Schulz Rolf
- 👤 Loflund Irmela
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-01 03:48
CPC Classifications
C; C08; C08G; C08G2/00; C08G2/06; C08G2/14; C08G81/00; C08G81/02; C09; C09D; C09D129/00; C09D129/12
Claims Analysis
Total Claims: 1
Claim 1
Independent Claim
98 words
THE PRODUCT OF A REACTION OF AN INFUSIBLE MACROMOLECULAR HOMOPOLYMER OF ACROLEIN HAVING A MOLECULAR WEIGHT OF AT LEAST 10,000 PRODUCED IN THE PRESENCE OF A FREE RADICAL POLYMERIZATION CATALYST DISSOLVING IN AN AQUEOUS SOLUTION OF SULFUROUS ACID HAVING A PH BETWEEN 1 AND 5 WITH A POLYMERIC COMPOUND SELECTED FROM THE GROUP CONSISTING OF NATURAL AND SYNTHETIC POLYMERIC COMPOUNDS WHICH ARE MACROMOLECULAR AND CONTAIN MORE THAN FOUR GROUP PER MARCORMOLECULE WHICH ARE REACTIVE WITH ALDEHYDR GROUPS SELECTED FROM THE GROUP CONSISTING OF OH, SH, NH2, NH2-NH AND ACTIVATED CH2 GROUPS AT A TEMPERATURE BETWEEN 0* AND 200*C.
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) | 1969-09-05 | 1970-03-07 | 1970-09-06 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1973-09-05 | 1974-03-07 | 1974-09-06 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1977-09-05 | 1978-03-07 | 1978-09-06 | $7700.00 | Window Closed / Lapsed |