Patent US1970335A successfully refreshed from Google Patents.
US2739948A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Ion-exchange resins from divinyl pyridine
Assignee: Beazer East Inc
•
Filing: 1951-11-21
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Granted: 1956-03-27
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Expires: 1971-11-21
Abstract
No abstract record available.
Inventors
- 👤 Alelio Gaetano F D
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-24 11:35
CPC Classifications
C; C08; C08F; C08F20/00; C08F20/02; C08F20/08
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
4 words
HOMOPOLYMERIC N-ALKYL DIVINYLPHYRIDINIUM HYDROXIDE.
Claim 2
Dependent Claim
4 words
HOMOPOLYMERIC N-ALKYL DIVINYLPHYRIDINIUM HYDROXIDE.
References Cited (Backward Citations)
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US2366008A
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US2534285A
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US2484430A
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US2631993A
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US2540984A
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US2559529A
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US2540985A
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US2688009A
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US2677688A
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USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1959-03-27 | 1959-09-26 | 1960-03-27 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1963-03-27 | 1963-09-26 | 1964-03-27 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1967-03-27 | 1967-09-26 | 1968-03-27 | $7700.00 | Window Closed / Lapsed |