US2595335A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Molding powders from urea and gaseous formaldehyde
Assignee: Akzo Nobel UK PLC
•
Filing: 1949-02-26
•
Granted: 1952-05-06
•
Expires: 1969-02-26
Abstract
No abstract record available.
Inventors
- 👤 Ralph T K Cornwell
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-27 08:34
CPC Classifications
C; C08; C08G; C08G12/00; C08G12/02; C08G12/04; C08G12/10; C08G12/12
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
118 words
IN THE MANUFACTURE OF THERMOSETTING COMPOSITIONS, THE IMPROVED PROCESS OF PREPARING DRY, FUSIBLE, HEAT-SETTABLE POWDERS COMPRISING A RESIN-FORMING CONDENSATE OF FORMALDEHYDE AND UREA WHICH COMPRISES IMPREGNATING A PULP OF FILLER MATERIAL WITH AN AQUEOUS SOLUTION OF UREA, DEHYDRATING THE IMPREGNATED MASS TO A CONTROLLED MOSITURE CONTENT OF FROM 5 TO 20% BY WEIGHT, CONTACTING THE MASS WITH GASEOUS FORMALDEHYDE TO PRODUCE THE RESIN-FORMING CONDENSATE IN SITU IN THE FILLER, DRYING THE IMPREGNATED MASS AT A TEMPERATURE OF ABOUT 60*-70* C., SAID FILLER MATERIAL COMPRISING 30 TO 60% BY WEIGHT OF THE DRIED MASS, AND SUBDIVIDING THE DRIED MASS TO PARTICLE SIZE TO OBTAIN A MOLDING POWDER CAPABLE OF BEING MOLDED TO AN INFUSIBLE CONDITION UNDER HEAT AND PRESSURE.
Claim 2
Dependent Claim
118 words
IN THE MANUFACTURE OF THERMOSETTING COMPOSITIONS, THE IMPROVED PROCESS OF PREPARING DRY, FUSIBLE, HEAT-SETTABLE POWDERS COMPRISING A RESIN-FORMING CONDENSATE OF FORMALDEHYDE AND UREA WHICH COMPRISES IMPREGNATING A PULP OF FILLER MATERIAL WITH AN AQUEOUS SOLUTION OF UREA, DEHYDRATING THE IMPREGNATED MASS TO A CONTROLLED MOSITURE CONTENT OF FROM 5 TO 20% BY WEIGHT, CONTACTING THE MASS WITH GASEOUS FORMALDEHYDE TO PRODUCE THE RESIN-FORMING CONDENSATE IN SITU IN THE FILLER, DRYING THE IMPREGNATED MASS AT A TEMPERATURE OF ABOUT 60*-70* C., SAID FILLER MATERIAL COMPRISING 30 TO 60% BY WEIGHT OF THE DRIED MASS, AND SUBDIVIDING THE DRIED MASS TO PARTICLE SIZE TO OBTAIN A MOLDING POWDER CAPABLE OF BEING MOLDED TO AN INFUSIBLE CONDITION UNDER HEAT AND PRESSURE.
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) | 1955-05-06 | 1955-11-05 | 1956-05-06 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1959-05-06 | 1959-11-05 | 1960-05-06 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1963-05-06 | 1963-11-05 | 1964-05-06 | $7700.00 | Window Closed / Lapsed |