US3239487A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Method of preparing foamable novolaks
Assignee: US Philips Corp
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Filing: 1961-07-24
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Granted: 1966-03-08
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Expires: 1981-07-24
Abstract
No abstract record available.
Inventors
- 👤 Dijkstra Rinse
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-29 07:04
CPC Classifications
C; C08; C08J; C08J9/00; C08J9/02; C08G; C08G8/00; C08G8/04; C08G8/08; C08G8/10; C08G8/12; C08G8/20; C08G8/22; C08G8/24; C08G8/28; C08J2361/00; C08J2361/04; C08J2361/06
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
167 words
A METHOD OF PRODUCING A NOVALAK, CAPABLE WHEN MIXED WITH HEXAMETHYLENETETRAMINE AND SUBJECTED TO HEAT OF FORMING A HARDENED FOAMED MASS HAVING CELLS OF SUBSTANTIALLY UNIFORM SIZE, WHICH METHOD COMPRISES HEATING AT LEAST 3 GRAM MOLECULES OF FORMALDEHYDE WITH A GRAM MOLECULE OF A TRIFUNCTIONAL HYDROXYGENZENE SELECTED FROM THE GROUP CONSISTING OF PHENOL, M-CRESOL, 3,5-ZYLENOL AND RESORCINOL IN AN ALKALINE MEDIUM FOR SUCH A TIME THAT FROM ABOUT 2.00 TO 2.50 GRAM MOLECULES OF THE FORMALDEHYDE ARE BOUND TO THE HYDROXYBENZENE AND THEN THE STEPS CONSISTING OF NEUTRALIZING AND ACIDIFYING THE RESULTANT REACTION MIXTURE, ADDING A BIFUNCTIONAL MONOMERIC HYDROXY BENZENE COMPOUND SELECTED FROM THE GROUP CONSISTING OF O-CRESOL, P-CRESOL, 2,3-XYLENOL, 2,5-XYLENOL AND T-BUTYL PHENOL, SAID BIFUNCTIONAL MONOMERIC HYDROXY BENZENE BEING ADDED IN SUCH A QUANTITY THAT THE MOLECULAR RATIO OF THE SUM OF THE TOTAL AMOUNT OF THE TRIFUNCTIONAL HYDROXY BENZENE COMPOUND AND THE BIFUNCTIONAL HYDROXY BENZENE COMPOUND TO THE FORMALDEHYDE IS FROM 10:9 TO 11:9 AND CONTINUING TO HEAT THE MIXTURE UNTIL THE NOVOLAK IS FORMED.
Claim 2
Independent Claim
167 words
A METHOD OF PRODUCING A NOVALAK, CAPABLE WHEN MIXED WITH HEXAMETHYLENETETRAMINE AND SUBJECTED TO HEAT OF FORMING A HARDENED FOAMED MASS HAVING CELLS OF SUBSTANTIALLY UNIFORM SIZE, WHICH METHOD COMPRISES HEATING AT LEAST 3 GRAM MOLECULES OF FORMALDEHYDE WITH A GRAM MOLECULE OF A TRIFUNCTIONAL HYDROXYGENZENE SELECTED FROM THE GROUP CONSISTING OF PHENOL, M-CRESOL, 3,5-ZYLENOL AND RESORCINOL IN AN ALKALINE MEDIUM FOR SUCH A TIME THAT FROM ABOUT 2.00 TO 2.50 GRAM MOLECULES OF THE FORMALDEHYDE ARE BOUND TO THE HYDROXYBENZENE AND THEN THE STEPS CONSISTING OF NEUTRALIZING AND ACIDIFYING THE RESULTANT REACTION MIXTURE, ADDING A BIFUNCTIONAL MONOMERIC HYDROXY BENZENE COMPOUND SELECTED FROM THE GROUP CONSISTING OF O-CRESOL, P-CRESOL, 2,3-XYLENOL, 2,5-XYLENOL AND T-BUTYL PHENOL, SAID BIFUNCTIONAL MONOMERIC HYDROXY BENZENE BEING ADDED IN SUCH A QUANTITY THAT THE MOLECULAR RATIO OF THE SUM OF THE TOTAL AMOUNT OF THE TRIFUNCTIONAL HYDROXY BENZENE COMPOUND AND THE BIFUNCTIONAL HYDROXY BENZENE COMPOUND TO THE FORMALDEHYDE IS FROM 10:9 TO 11:9 AND CONTINUING TO HEAT THE MIXTURE UNTIL THE NOVOLAK IS FORMED.
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) | 1969-03-07 | 1969-09-06 | 1970-03-08 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1973-03-07 | 1973-09-06 | 1974-03-08 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1977-03-07 | 1977-09-06 | 1978-03-08 | $7700.00 | Window Closed / Lapsed |