Patent US2520100A successfully refreshed from Google Patents.
US2520100A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Tetrachlorophthalic acid and anhydride curing of aminoplasts
Assignee: Wyeth Holdings LLC
•
Filing: 1948-06-14
•
Granted: 1950-08-22
•
Expires: 1968-06-14
Abstract
No abstract record available.
Inventors
- 👤 Morfit Edwin Fiske
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-25 21:19
CPC Classifications
C; C08; C08K; C08K5/00; C08K5/04; C08K5/15; C08K5/151; C08K5/1535; C08K5/1539
Claims Analysis
Total Claims: 1
Claim 1
Independent Claim
87 words
A MOLDING COMPOSITION BEING STABLE AT NORMAL TEMPERATURES AND CAPABLE OF RAPIDLY CURING TO AN INFUSIBLE STATE AT ELEVATED TEMPERATURES COMPRISING AN AMINOPLAST SELECTED FROM THE GROUP CONSISTING OF UREA-FORMALDEHYDE RESIN AND MELAMINE-FORMALDEHYDE RESIN AND AN ACIDIC CATALYST SELECTED FROM THE GROUP CONSISTING OF TETRACHLOROPHTHALIC ANHYDRIDE AND THE ACID THEREOF, SAID CATALYST BEING PRESENT IN AN AMOUNT FROM ABOUT 0.05% TO ABOUT 0.5% BASED ON THE WEIGHT OF RESIN, AND HEXAMETHYLENETETRAMINE PRESENT IN AN AMOUNT FROM ABOUT 0.1% TO ABOUT 0.5% BASED ON THE WEIGHT OF RESIN.
References Cited (Backward Citations)
US2056462A
Cited
US2192129A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1953-08-21 | 1954-02-20 | 1954-08-22 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1957-08-21 | 1958-02-20 | 1958-08-22 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1961-08-21 | 1962-02-20 | 1962-08-22 | $7700.00 | Window Closed / Lapsed |