Patent US2841571A successfully refreshed from Google Patents.
US2841571A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Resinous composition
Assignee: Wyeth Holdings LLC
•
Filing: 1954-11-02
•
Granted: 1958-07-01
•
Expires: 1974-11-02
Abstract
No abstract record available.
Inventors
- 👤 Henry P Wohnsiedler
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 21:40
CPC Classifications
C; C08; C08G; C08G12/00; C08G12/02; C08G12/26; C08G12/30; C08G12/32; C08L; C08L61/00; C08L61/20; C08L61/26; C08L61/28
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
113 words
A PROCESS FOR PREPARING A THERMOSETTING MELAMINEFORMALDEHYDE RESINOUS COMPOSITION WHICH COMPRISES REACTING AT REFLUX TEMPERATURE IN A SERIES OF N STATES MELAMINE AND AQUEOUS FORMALDEHYDE UNTIL THE MELAMINE HAS DISSOLVED AND THE CONDENSATION REACTION HAS ADVANCED TO A POINT WITHIN THE HYDROPHILIC TO PARTLY HYDROPHOBIC STATE WHEREIN THE FORMALDEHYDE IS INTRODUCED INTO THE SPHERE OF REACTION IN AMOUNTS APPROXIMATING 1/NTH OF THE TOTAL QUANTITY OF FORMALDEHYDE TO BE INTRODUCED, N TIMES, THE PH VALUE IS MAINTAINED AT ABOUT 8.0 TO ABOUT 9.5 DURING THE REACTION, THE MOL RATIO OF TOTAL FORMALDEHYDE TO MELAMINE IS WITHIN THE ORDER OF ABOUT 0.9:1 TO ABOUT 1.5:1, RESPECTIVELY, AND N IS AN INTEGER OF AT LEAST 2.
Claim 2
Dependent Claim
113 words
A PROCESS FOR PREPARING A THERMOSETTING MELAMINEFORMALDEHYDE RESINOUS COMPOSITION WHICH COMPRISES REACTING AT REFLUX TEMPERATURE IN A SERIES OF N STATES MELAMINE AND AQUEOUS FORMALDEHYDE UNTIL THE MELAMINE HAS DISSOLVED AND THE CONDENSATION REACTION HAS ADVANCED TO A POINT WITHIN THE HYDROPHILIC TO PARTLY HYDROPHOBIC STATE WHEREIN THE FORMALDEHYDE IS INTRODUCED INTO THE SPHERE OF REACTION IN AMOUNTS APPROXIMATING 1/NTH OF THE TOTAL QUANTITY OF FORMALDEHYDE TO BE INTRODUCED, N TIMES, THE PH VALUE IS MAINTAINED AT ABOUT 8.0 TO ABOUT 9.5 DURING THE REACTION, THE MOL RATIO OF TOTAL FORMALDEHYDE TO MELAMINE IS WITHIN THE ORDER OF ABOUT 0.9:1 TO ABOUT 1.5:1, RESPECTIVELY, AND N IS AN INTEGER OF AT LEAST 2.
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) | 1961-06-30 | 1961-12-30 | 1962-07-01 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1965-06-30 | 1965-12-30 | 1966-07-01 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1969-06-30 | 1969-12-30 | 1970-07-01 | $7700.00 | Window Closed / Lapsed |