US3654340A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Cyanoacrylate monomer process
Assignee: 3M Co
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Filing: 1970-08-27
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Granted: 1972-04-04
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Expires: 1990-08-27
Abstract
Abstract A NEW STEP IN THE CONDENSATION OF FORMALDEHYDE AND ESTERS OF 2-CYANOACETIC ACID TO PRODUCE 2-CYANOACRYLATE ESTERS WHICH CONSISTS ESSENTIALLY OF CATALYZING THE REACTION BY MEANS OF A MIXTURE OF AN ACID AND THE SALT OF A PRIMARY OR SECONDARY AMINE WITH THE SAME OR STRONGER ACID. TO BE EFFECTIVE, THE CATALYTIC MIXTURE SHOULD HAVE A PH VALUE OF 5 OR LESS WHEN EXACT AMOUNTS OF ITS COMPONENTS ARE DISSOLVED IN 25 ML. OF WATER. IF THE CATALYTIC MIXTURE IS TO INCLUDE AN ACID WHICH IS NOT READILY SOLUBLE IN WATER (E.G. ORGANIC ACIDS), THEN THE PH IS MEASURED IN 25 ML. OF AN ETHANOL-WATER MIXTURE OF SUBSEQUENT CORRECTED AS DESCRIBED IN J. AM. CHEM. SOC., 75,576 (1953).
Inventors
- 👤 Elden H Banitt
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-05 17:44
CPC Classifications
C; C07; C07C; C07C255/00
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) | 1975-04-04 | 1975-10-04 | 1976-04-04 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1979-04-04 | 1979-10-04 | 1980-04-04 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1983-04-04 | 1983-10-04 | 1984-04-04 | $7700.00 | Window Closed / Lapsed |