Patent US2587558A successfully refreshed from Google Patents.
US2587558A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Preparation of novel 2-carboalkoxy-1, 3-butadienes and polymers thereof
Assignee: Goodrich Corp
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Filing: 1948-06-25
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Granted: 1952-02-26
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Expires: 1968-06-25
Abstract
No abstract record available.
Inventors
- 👤 Jerome C Westfahl
- 👤 Daniel S Sears
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 20:08
CPC Classifications
C; C08; C08F; C08F36/00; C08F36/02; C08F36/04
Claims Analysis
Total Claims: 1
Claim 1
Independent Claim
42 words
A SUBSTANTIALLY LINEAR POLYMER OF A 2-CARBOALKOXY-1,3-BUTADIENE, SAID POLYMER BEING PREPARED BY ADDING A FRIEDEL-CRAFTS CATALYST TO THE MONOMER WHILE COOLING THE MONOMER TO A TEMPERATURE BELOW 0* C., AND THEN DISCONTINUING THE COOLING, WHEREUPON SAID POLYMER FORMS AS AN INSOLUBLE POWDER.
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) | 1955-02-25 | 1955-08-27 | 1956-02-26 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1959-02-25 | 1959-08-27 | 1960-02-26 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1963-02-25 | 1963-08-27 | 1964-02-26 | $7700.00 | Window Closed / Lapsed |