Patent US2897171A successfully refreshed from Google Patents.
US2897171A
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Process for improving the flowing qualities of phenol-formaldehyde molding compositions and molding compositions resulting therefrom
Assignee: Hoechst AG Werk Kalle Albert
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Filing: 1953-06-15
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Granted: 1959-07-28
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Expires: 1973-06-15
Abstract
No abstract record available.
Inventors
- 👤 Cserny Ludwig
- 👤 Schmitz Joseph
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-26 22:12
CPC Classifications
C; C08; C08J; C08J7/00; C08J7/02; C08J2361/00; C08J2361/04; C08J2361/06
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
73 words
A PROCESS FOR IMPROVING THE FLOWING QUALITIES OF HEAT-HARDENABLE, PHENOL-FORMALDEHYDE RESIN, MOLDING COMPOSITIONS WHICH COMPRISES SWELLING THE SURFACE LAYER OF SAID COMPOSITIONS BY APPLYING THERETO IN VAPOROUS FORM A SWELLING SOLVENT FOR THE RESIN THEREIN IN A QUANTITY WHICH CAUSES THE COMPOSITION TO TAKE UP NOT MORE THAN 3.5% THEREOF BY WEIGHT, SAID SOLVENT BEING SELECTED FROM THE GROUP CONSISTING OF AMMONIA, ALDEHYDES ALCOHOLS AND KETONES, AND VAPORIZABLE AT A TEMPERATURE BELOW 100*C.
Claim 2
Dependent Claim
73 words
A PROCESS FOR IMPROVING THE FLOWING QUALITIES OF HEAT-HARDENABLE, PHENOL-FORMALDEHYDE RESIN, MOLDING COMPOSITIONS WHICH COMPRISES SWELLING THE SURFACE LAYER OF SAID COMPOSITIONS BY APPLYING THERETO IN VAPOROUS FORM A SWELLING SOLVENT FOR THE RESIN THEREIN IN A QUANTITY WHICH CAUSES THE COMPOSITION TO TAKE UP NOT MORE THAN 3.5% THEREOF BY WEIGHT, SAID SOLVENT BEING SELECTED FROM THE GROUP CONSISTING OF AMMONIA, ALDEHYDES ALCOHOLS AND KETONES, AND VAPORIZABLE AT A TEMPERATURE BELOW 100*C.
References Cited (Backward Citations)
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US2097885A
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US2497346A
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USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1962-07-27 | 1963-01-26 | 1963-07-28 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1966-07-27 | 1967-01-26 | 1967-07-28 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1970-07-27 | 1971-01-26 | 1971-07-28 | $7700.00 | Window Closed / Lapsed |