Patent US2755263A successfully refreshed from Google Patents.
US2755263A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Production of adhesives from ureaformaldehyde resins
Assignee: BASF SE
•
Filing: 1952-10-18
•
Granted: 1956-07-17
•
Expires: 1972-10-18
Abstract
No abstract record available.
Inventors
- 👤 Scheuermann Hans
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-09 03:34
CPC Classifications
C; C08; C08G; C08G12/00; C08G12/02; C08G12/04; C08G12/10; C08G12/12
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
90 words
A PROCESS FOR THE PRODUCTION OF ADHESIVES FROM CONDENSATION PRODUCTS OF UREA AND FORMALDEHYDE WHICH COMPRISES SUBJECTING AN INITIAL STAGE CONDENSATION PRODUCT OF UREA AND FORMALDEHYDE, WHEREIN THE MOLE RATIO OF UREA TO FORMALDEHYDE IS APPROXIMATELY IN THE RANGE OF 1:1.75 TO 1:2.5 AND WHICH IS STILL SOLUBLE IN WATER AFTER DRYING, TO A THERMAL TREATMENT IN WHICH SAID DRIED CONDENSATION PRODUCT IS HEATED TO A TEMPERATURE BETWEEN 100* C. AND 200* C. UNTIL IT IS PRACTICALLY INSOLUBLE IN COLD WATER BUT IS SUBSTANTIALLY ONLY DISPERSIBLE IN WATER WITH SWELLING.
Claim 2
Dependent Claim
90 words
A PROCESS FOR THE PRODUCTION OF ADHESIVES FROM CONDENSATION PRODUCTS OF UREA AND FORMALDEHYDE WHICH COMPRISES SUBJECTING AN INITIAL STAGE CONDENSATION PRODUCT OF UREA AND FORMALDEHYDE, WHEREIN THE MOLE RATIO OF UREA TO FORMALDEHYDE IS APPROXIMATELY IN THE RANGE OF 1:1.75 TO 1:2.5 AND WHICH IS STILL SOLUBLE IN WATER AFTER DRYING, TO A THERMAL TREATMENT IN WHICH SAID DRIED CONDENSATION PRODUCT IS HEATED TO A TEMPERATURE BETWEEN 100* C. AND 200* C. UNTIL IT IS PRACTICALLY INSOLUBLE IN COLD WATER BUT IS SUBSTANTIALLY ONLY DISPERSIBLE IN WATER WITH SWELLING.
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) | 1959-07-17 | 1960-01-16 | 1960-07-17 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1963-07-17 | 1964-01-16 | 1964-07-17 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1967-07-17 | 1968-01-16 | 1968-07-17 | $7700.00 | Window Closed / Lapsed |