US3219644A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Vinyl keto polymers and method of making same
Assignee: Dow Chemical Co
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Filing: 1962-05-31
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Granted: 1965-11-23
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Expires: 1982-05-31
Abstract
No abstract record available.
Inventors
- 👤 Frederick C Leavitt
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-01 03:40
CPC Classifications
G; G11; G11B; G11B20/00; G11B20/20; C; C08; C08F; C08F8/00; G06; G06K; G06K1/00; G06K1/12; G11B5/00; G11B5/02; G11C; G11C11/00; G11C11/02; G11C11/08
Claims Analysis
Total Claims: 4
Claim 1
Independent Claim
30 words
THE PROCESS OF PREPARING A VINYL KETO DERIVATIVE OF AN ALKENYL AROMATIC POLYMER COMPRISING THE STEPS OF: (A) ACYLATING A PREFORMED POLYMER OF AN ALKENYL AROMATIC COMPOUND OF THE FORMULA
Claim 2
Dependent Claim
30 words
THE PROCESS OF PREPARING A VINYL KETO DERIVATIVE OF AN ALKENYL AROMATIC POLYMER COMPRISING THE STEPS OF: (A) ACYLATING A PREFORMED POLYMER OF AN ALKENYL AROMATIC COMPOUND OF THE FORMULA
Claim 3
Dependent Claim
18 words
A LINEAR POLYMER HAVING IN THE POLYMER CHAIN THEREOF A PLURALITY OF AROMATIC REPEATING UNITS HAVING THE FORMULA
Claim 4
Dependent Claim
18 words
A LINEAR POLYMER HAVING IN THE POLYMER CHAIN THEREOF A PLURALITY OF AROMATIC REPEATING UNITS HAVING THE FORMULA
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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) | 1968-11-22 | 1969-05-24 | 1969-11-23 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1972-11-22 | 1973-05-24 | 1973-11-23 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1976-11-22 | 1977-05-24 | 1977-11-23 | $7700.00 | Window Closed / Lapsed |