Patent US3632537A successfully refreshed from Google Patents.
US3632537A
Expired / Lapsed
US
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Phenolic resin compositions and process
Assignee: Societa Italiana Resine SpA SIR
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Filing: 1968-04-22
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Granted: 1972-01-04
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Expires: 1988-04-22
Abstract
Abstract A PROCESS FOR PREPARING A PHENOL/ALDEHYDE MOULDINGSAND RESIN IS PROVIDED IN WHICH THE ALDEHYDE, PREFERABLY FORMALDEHYDE, AND THE PHENOL, PREFERABLY PHENOL ITSELF. ARE CONDENSED IN THE PRESENCE OF AN ACID CATALYST HAVING A DISSOCIATION CONSTANT EXCEEDING ABOUT 1.7X10-5 UNTIL A RESIN HAVING A PHENOL/ALDEHYDE MOLAR RATIO OF 1 TO 0.9 TO 1 TO 0.4 AND A MELTING POINT UP TO 80*C. IS PRODUCED.
Inventors
- 👤 Teo Paleologo
- 👤 Silvio Vargiu
- 👤 Silvestro Pezzoli
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-06 11:00
CPC Classifications
B; B22; B22C; B22C1/00; B22C1/16; B22C1/20; B22C1/22; B22C1/2233; B22C1/2246; B22C1/2253; C; C08; C08G; C08G8/00; C08G8/04; C08G8/08; C08G8/10; Y; Y10; Y10T; Y10T428/00; Y10T428/29; Y10T428/2982; Y10T428/2991; Y10T428/2993; Y10T428/2998
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) | 1975-01-03 | 1975-07-05 | 1976-01-04 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1979-01-03 | 1979-07-05 | 1980-01-04 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1983-01-03 | 1983-07-05 | 1984-01-04 | $7700.00 | Window Closed / Lapsed |