Patent US2548416A successfully refreshed from Google Patents.
US2548416A
Expired / Lapsed
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Amino-aldehyde condensation products and processes for preparing them
Assignee: Individual
•
Filing: 1949-01-14
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Granted: 1951-04-10
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Expires: 1969-01-14
Abstract
No abstract record available.
Inventors
- 👤 Barsky George
- 👤 Frank A Strauss
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-04 03:50
CPC Classifications
C; C08; C08G; C08G12/00; C08G12/02; C08G12/04; C08G12/10; C08G12/12
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
84 words
A PROCESS FOR PREPARING WATER-SOLUBLE RESINOUS COMPOSITIONS WHICH CONSISTS IN HEATING DIMETHYLOL UREA UNTIL SUBSTANTIALLY COMPLETE SOLUTION IS EFFECTED WITH AT LEAST ONE-SEVENTH OF ITS WEIGHT OF FORMALDEHYDE DISSOLVED IN WATER AND HAVING AN INITIAL PH VALUE GREATER THAN 7.0, THEN ADDING UREA TO SAID SOLUTION IN SUCH PROPORTION THAT MOLECULAR RATIO OF CARBAMINE GROUPINGS TO METHYLOL GROUPINGS PRESENT IS NOT LESS THAN 1:2.5 AND NOT GREATER THAN 1:1.8F AND CONTINUING HEATING AT A PH VALUE THAN 7.0 UNTIL A RESINOUS PRODUCT IS OBTAINED.
Claim 2
Dependent Claim
84 words
A PROCESS FOR PREPARING WATER-SOLUBLE RESINOUS COMPOSITIONS WHICH CONSISTS IN HEATING DIMETHYLOL UREA UNTIL SUBSTANTIALLY COMPLETE SOLUTION IS EFFECTED WITH AT LEAST ONE-SEVENTH OF ITS WEIGHT OF FORMALDEHYDE DISSOLVED IN WATER AND HAVING AN INITIAL PH VALUE GREATER THAN 7.0, THEN ADDING UREA TO SAID SOLUTION IN SUCH PROPORTION THAT MOLECULAR RATIO OF CARBAMINE GROUPINGS TO METHYLOL GROUPINGS PRESENT IS NOT LESS THAN 1:2.5 AND NOT GREATER THAN 1:1.8F AND CONTINUING HEATING AT A PH VALUE THAN 7.0 UNTIL A RESINOUS PRODUCT IS OBTAINED.
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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) | 1954-04-09 | 1954-10-09 | 1955-04-10 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1958-04-09 | 1958-10-09 | 1959-04-10 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1962-04-09 | 1962-10-09 | 1963-04-10 | $7700.00 | Window Closed / Lapsed |