Patent US3059946A successfully refreshed from Google Patents.
Patent US3583948A successfully refreshed from Google Patents.
US3583948A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Paper sizing resin
Assignee: Individual
•
Filing: 1968-04-15
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Granted: 1971-06-08
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Expires: 1988-04-15
Abstract
Abstract SIZED PAPER HAVING HIGH INK RESISTANCE IS PREPARED FROM PAPER STOCK IN WHICH A NEW RESIN IS DISPERSED. THE RESIN IS OBTAINED FROM A DIELS-ALDER REACTION PRODUCT OF DIPENTENE OR OTHER TERPENE HYDROCARBON WITH MALEIC ANHYDRIDE, WHICH IS FURTHER REACTED WITH AMMONIA AND THEREAFTER WITH DIETHYLENETRIAMINE TO PRODUCE AN IMIDE-AMINE, THE LATTER BEING MADE DISPERSIBLE IN WATER BY REACTION WITH EPICHLOROHYDRIN, ALL REACTIONS BEING CARRIED OUT IN THE ABSENCE OF A SOLVENT AT TEMPERATURE HIGH ENOUGH TO MAKE THE REACTION MEXTURES LIQUID.
Inventors
- 👤 Friedrich Blechinger
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-29 16:55
CPC Classifications
D; D21; D21H; D21H17/00; D21H17/62; D21H17/20; D21H17/33; D21H17/46; D21H17/54; D21H17/55
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) | 1974-06-07 | 1974-12-07 | 1975-06-08 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1978-06-07 | 1978-12-07 | 1979-06-08 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1982-06-07 | 1982-12-07 | 1983-06-08 | $7700.00 | Window Closed / Lapsed |