Patent US2667520A successfully refreshed from Google Patents.
US2667520A
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Polymerization of acetylene to open chain polymers with nickel coordination compound catalysts
Assignee: EIDP Inc
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Filing: 1952-12-04
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Granted: 1954-01-26
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Expires: 1972-12-04
Abstract
No abstract record available.
Inventors
- 👤 Elbert C Herrick
- 👤 John C Sauer
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-04 19:28
CPC Classifications
C; C07; C07C; C07C2/00; C07C2/02; C07C2/04; C07C2/38; C07C2531/00; C07C2531/16; C07C2531/22
Claims Analysis
Total Claims: 1
Claim 1
Independent Claim
42 words
PROCESS OF SYNTHESIZING OPEN-CHAIN ACETYLENE POLYMERS WHICH COMPRISES CONTINUOUSLY INTRODUCING ACETYLENE AT A TEMPERATURE ABOVE ABOUT 50* C. INTO A SOLUTION OF THE NICKEL SALT OF THE ENOL FORM OF AN ACETOACETIC ESTER IN PYRIDINE, AND SEPARATING MONOVINYLACETYLENE FROM THE REACTION PRODUCTS.
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) | 1957-01-25 | 1957-07-27 | 1958-01-26 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1961-01-25 | 1961-07-27 | 1962-01-26 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1965-01-25 | 1965-07-27 | 1966-01-26 | $7700.00 | Window Closed / Lapsed |