US2540984A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Copolymers of vinyl pyridine and polyvinyl aromatic compounds
Assignee: Monsanto Chemicals Ltd
•
Filing: 1948-10-19
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Granted: 1951-02-06
•
Expires: 1968-10-19
Abstract
No abstract record available.
Inventors
- 👤 Elwood F Jackson
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-22 21:48
CPC Classifications
C; C08; C08F; C08F20/00; C08F20/02; C08F20/08
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
41 words
AN ANION EXCHANGE RESIN COMPRISING A COPOLYMER OF 100 PARTS OF MONOVINYL SUBSTITUTED HETEROCYCLIC COMPOUND CONTAINING A NITROGEN ATOM IN THE HETEROCYCLIC RING AND FROM 1 TO 20 PARTS OF A POLYVINYL AROMATIC COMPOUND CONTAINING FROM 2 TO 4 VINYL GROUPS.
Claim 2
Dependent Claim
41 words
AN ANION EXCHANGE RESIN COMPRISING A COPOLYMER OF 100 PARTS OF MONOVINYL SUBSTITUTED HETEROCYCLIC COMPOUND CONTAINING A NITROGEN ATOM IN THE HETEROCYCLIC RING AND FROM 1 TO 20 PARTS OF A POLYVINYL AROMATIC COMPOUND CONTAINING FROM 2 TO 4 VINYL GROUPS.
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) | 1954-02-05 | 1954-08-07 | 1955-02-06 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1958-02-05 | 1958-08-07 | 1959-02-06 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1962-02-05 | 1962-08-07 | 1963-02-06 | $7700.00 | Window Closed / Lapsed |