US3600464A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Solvent resistant vinyl-pyridine block polymer derivatives and their preparation
Assignee: Shell USA Inc
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Filing: 1968-10-03
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Granted: 1971-08-17
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Expires: 1988-10-03
Abstract
Abstract NOVEL BLOCK COPOLYMER DERIVATIVES, RESISTANT TO NONPOLAR ORGANIC SOLVENTS, ARE DISCLOSED. THESE COMPRISE BLOCK COPOLYMERS OF THE GROUP CONSISTING OF BLOCK COPOLYMERS HAVING AT LEAST THREE POLYMER BLOCKS, AT LEAST TWO OF THE BLOCKS BEING POLYMERIZED VINYL-PRRIDINE COMPOUNDS, DISSIMILAR TO THE ADJACENT BLOCKS, AND AT LEAST ONE OF THE BLOCKS BEING POLYMERIZED CONJUGATED DIENE, AND HYDROGENATED DERIVATIVES THE COPOLYMERS, AT LEAST 50% OF THE HETEROCYCLIC NITROGEN ATOMS BEING REACTION PRODUCTS WITH MINERAL ACIDS.
Inventors
- 👤 Ralph H Bauer
- 👤 Alfred W Shaw
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-28 11:38
CPC Classifications
C; C08; C08J; C08J7/00; C08J7/12; C08F; C08F8/00; C08F8/18; C08F8/20; C08K; C08K3/00; C08K3/01; C08K5/00; C08K5/0008; C08J2353/00
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
No citation records indexed.
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1974-08-16 | 1975-02-15 | 1975-08-17 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1978-08-16 | 1979-02-15 | 1979-08-17 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1982-08-16 | 1983-02-15 | 1983-08-17 | $7700.00 | Window Closed / Lapsed |