US2848436A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Preparation of phenolic resins
Assignee: PPG Industries Inc
•
Filing: 1954-05-03
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Granted: 1958-08-19
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Expires: 1974-05-03
Abstract
No abstract record available.
Inventors
- 👤 Roger M Christenson
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-31 12:54
CPC Classifications
C; C08; C08G; C08G8/00; C08G8/04
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
53 words
THE METHOD WHICH COMPRISES CONDENSING A MIXTURE OF ALKENYLPHENOLS CONTAINING FROM 4 TO 5 CARBON ATOMS IN EACH ALKENYL GROUPS WITH FORMALDEHYDE IN THE PRESENCE OF AN ALKALINE CATALYST AND A WATER SOLUBLE ALKALI METAL HYDROSULFITE, THEREBY TO OBTAIN AN OIL SOLUBLE, LIGHT COLORED RESIN CAPABLE OF FORMING FAST CURING, LIGHT COLORED FILMS.
Claim 2
Independent Claim
53 words
THE METHOD WHICH COMPRISES CONDENSING A MIXTURE OF ALKENYLPHENOLS CONTAINING FROM 4 TO 5 CARBON ATOMS IN EACH ALKENYL GROUPS WITH FORMALDEHYDE IN THE PRESENCE OF AN ALKALINE CATALYST AND A WATER SOLUBLE ALKALI METAL HYDROSULFITE, THEREBY TO OBTAIN AN OIL SOLUBLE, LIGHT COLORED RESIN CAPABLE OF FORMING FAST CURING, LIGHT COLORED FILMS.
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) | 1961-08-18 | 1962-02-17 | 1962-08-19 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1965-08-18 | 1966-02-17 | 1966-08-19 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1969-08-18 | 1970-02-17 | 1970-08-19 | $7700.00 | Window Closed / Lapsed |