Patent US4993745A successfully refreshed from Google Patents.
Patent US3594272A successfully refreshed from Google Patents.
US3594272A
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US
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Polymeric products of alkylene-polyamine-dihydrohalides,dicyandiamide,formaldehyde and epichlorohydrin and their use as retention aids in the manufacture of paper
Assignee: BASF Corp
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Filing: 1969-05-05
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Granted: 1971-07-20
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Expires: 1989-05-05
Abstract
Abstract NEW POLYMERIC PRODUCTS ARE PROVIDED WHICH ARE OBTAINED BY REACTING TOGETHER ABOUT 1 MOLAR PROPORTION OF AN ALKYLENE-POLYAMINE-DIHYDROHALIDE, ABOUT 2 MOLAR PROPORTIONS OF DICYANDIAMIDE, ABOUT 3-5 MOLAR PROPORTIONS OF FORMALDEHYDE AND ABOUT 1-3 MOLAR PROPORTIONS OF EPICHLOROHYDRIN. THE PRODUCTS OF THIS INVENTION ARE ESPECIALLY USEFUL AS RETENTION AIDS IN THE MANUFACTURE OF PAPER, TEXTILE AND NONWOVEN FABRICS.
Inventors
- 👤 Kwan Ting Shen
- 👤 Gary Wayne Jarvis
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-06 10:17
CPC Classifications
C; C08; C08G; C08G73/00; C08G73/02; C08G73/0206; C08G73/0213; C08G73/022; C08G12/00; C08G12/02; C08G12/04; C08G12/043; D; D06; D06P; D06P1/00; D06P1/44; D06P1/52; D06P1/56; D21; D21H; D21H17/00; D21H17/20; D21H17/33; D21H17/46; D21H17/47; D21H17/49
Claims Analysis
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References Cited (Backward Citations)
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USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1974-07-19 | 1975-01-18 | 1975-07-20 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1978-07-19 | 1979-01-18 | 1979-07-20 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1982-07-19 | 1983-01-18 | 1983-07-20 | $7700.00 | Window Closed / Lapsed |