Patent US3560576A successfully refreshed from Google Patents.
US3560576A
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US
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Ethynylation of formaldehyde
Assignee: EIDP Inc
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Filing: 1967-10-23
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Granted: 1971-02-02
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Expires: 1987-10-23
Abstract
Abstract PARTICULATE CATALYSTS, CONSISTING ESSENTIALLY OF CUPROUS ACETYLIDE COMPLEXES CONTAINING AT LEAST 1.75 CARBON ATOMS PER COPPER ATOM, AND HAVING A TOTAL SURFACE AREA OF AT LEAST 5.0 SQUARE METERS PER GRAM, ARE PREPARED AT 50120*C. BY THE SIMULTANEOUS ACTION OF FORMALDEHYDE AND ACETYLENE AT A PARTIAL PRESSURE OF LESS THAN 2.0 ATMOSPHERES ON CUPRIC COMPOUNDS SLURRIED IN SUBSTANTIALLY NEUTRAL AQUEOUS MEDIA AND USED TO CATALYZE ETHYNYLATION IN A CONTINUOUS STIRRED REACTION AT 60-120* C. AND ACETYLENE PARTIAL PRESSURES BELOW 2.0 ATMOSPHERES.
Inventors
- 👤 Jack R Kirchner
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-30 15:12
CPC Classifications
B; B01; B01J; B01J31/00; B01J31/16; B01J31/22; B01J31/2204; B01J31/2208; B01J31/2282; B01J31/2286; C; C07; C07C; C07C29/00; C07C29/36; C07C29/38; C07C29/42; C07F; C07F1/00; C07F1/08; B01J2231/00; B01J2231/30; B01J2231/34; B01J2231/341; B01J2531/00; B01J2531/10; B01J2531/16
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) | 1974-02-01 | 1974-08-03 | 1975-02-02 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1978-02-01 | 1978-08-03 | 1979-02-02 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1982-02-01 | 1982-08-03 | 1983-02-02 | $7700.00 | Window Closed / Lapsed |