US3778418A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Maleinization process
Assignee: Individual
•
Filing: 1971-09-22
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Granted: 1973-12-11
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Expires: 1991-09-22
Abstract
Abstract IN MALEINIZATION PROCESS IN WHICH A MALEIC ANHYDRIDE COMPOUND IS REACTED WITH AT LEAST ONE OF UNSATURATED POLYMERS HAVING ETHYLENOIC DOUBLE BOND IN THE MOLECULE, UNSATURATED FATTY ACIDS HAVING 8 TO 18 CARBON ATOMS AND ESTERS OF SAID UNSATURATED FATTY ACIDS TO PRODUCE A MALEINIZED PRODUCT, THE IMPROVEMENT WHEREIN SAID REACTION IS CARRIED OUT IN THE PRESENCE OF AT LEAST ONE OF NITROGENCONTAINING COMPOUNDS SELECTED FROM THE GROUP CONSISTING OF AMMONIA, AMMONIUM SALTS OF SATURATED FATTY ACIDS, MONOAMINE COMPOUNDS, DIAMINE COMPOUNDS AND AMIDE COMPOUNDS.
Inventors
- 👤 Y Nakayama
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-27 10:02
CPC Classifications
C; C08; C08C; C08C19/00; C08C19/28
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
No citation records indexed.
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1976-12-10 | 1977-06-11 | 1977-12-11 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1980-12-10 | 1981-06-11 | 1981-12-11 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1984-12-10 | 1985-06-11 | 1985-12-11 | $7700.00 | Window Closed / Lapsed |