US3247048A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Nitrogen prepolymers as wet and dry strength improvers for paper
Assignee: Monsanto Co
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Filing: 1962-09-10
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Granted: 1966-04-19
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Expires: 1982-09-10
Abstract
No abstract record available.
Inventors
- 👤 Van R Gaertner
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-26 10:25
CPC Classifications
D; D21; D21H; D21H17/00; D21H17/20; D21H17/33; D21H17/46; D21H17/54; C; C08; C08G; C08G69/00; C08G69/48; C08G73/00; C08G73/02; C08G73/0206; C08G73/028
Claims Analysis
Total Claims: 4
Claim 1
Independent Claim
74 words
A PREPOLYMER WHICH IS THE REACTION PRODUCT OF (A) AN ESSENTIALLY MONOMERIC ADDUCT OF AT LEAST TWO MOLAR PROPORTIONS OF AN EPIHALOHYDRIN PER MOLAR PROPORTION OF AN AMINE HAVING AT LEAST 1 PRIMARY AMINO NITROGEN AND FROM 2 TO 8 AMINO HYDROGENS, AND (B) AN AMINE HAVING AT LEAST 2 AMINO HYDROGENS, THE AMINE USED IN PREPARING SAID ADDUCT (A) AND THE AMINE (B) EACH HAVING A FORMULA SELECTED FROM THE GROUP CONSISTING OF
Claim 2
Dependent Claim
74 words
A PREPOLYMER WHICH IS THE REACTION PRODUCT OF (A) AN ESSENTIALLY MONOMERIC ADDUCT OF AT LEAST TWO MOLAR PROPORTIONS OF AN EPIHALOHYDRIN PER MOLAR PROPORTION OF AN AMINE HAVING AT LEAST 1 PRIMARY AMINO NITROGEN AND FROM 2 TO 8 AMINO HYDROGENS, AND (B) AN AMINE HAVING AT LEAST 2 AMINO HYDROGENS, THE AMINE USED IN PREPARING SAID ADDUCT (A) AND THE AMINE (B) EACH HAVING A FORMULA SELECTED FROM THE GROUP CONSISTING OF
Claim 3
Independent Claim
99 words
A METHOD FOR IMPROVING THE WET AND DRY STRENGTH AND DIMENSIONAL STABILITY CHARACTERISTICS OF CELLULOSIC PAPER WHICH COMPRISES ADDING TO THE AQUEOUS PULP WHICH IS TO BE USED TO MAKE SAID PAPER A MINOR AMOUNT OF (A) AN ESSENTIALLY MONOMERIC ADDUCT OF AT LEAST TWO MOLAR PROPORTIONS OF AN EPIHALOHYDRIN AND AN AMINE HAVING AT LEAST 1 PRIMARY AMINO NITROGEN AND FROM 2 TO 8 AMINO HYDROGENS, AND (B) AN AMINE HAVING AT LEAST 2 AMINO HYDROGENS, THE AMINE USED IN PREPARING SAID ADDUCT (A) AND THE AMINE (B) EACH HAVING A FORMULA SELECTED FROM THE GROUP CONSISTING OF
Claim 4
Independent Claim
99 words
A METHOD FOR IMPROVING THE WET AND DRY STRENGTH AND DIMENSIONAL STABILITY CHARACTERISTICS OF CELLULOSIC PAPER WHICH COMPRISES ADDING TO THE AQUEOUS PULP WHICH IS TO BE USED TO MAKE SAID PAPER A MINOR AMOUNT OF (A) AN ESSENTIALLY MONOMERIC ADDUCT OF AT LEAST TWO MOLAR PROPORTIONS OF AN EPIHALOHYDRIN AND AN AMINE HAVING AT LEAST 1 PRIMARY AMINO NITROGEN AND FROM 2 TO 8 AMINO HYDROGENS, AND (B) AN AMINE HAVING AT LEAST 2 AMINO HYDROGENS, THE AMINE USED IN PREPARING SAID ADDUCT (A) AND THE AMINE (B) EACH HAVING A FORMULA SELECTED FROM THE GROUP CONSISTING OF
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) | 1969-04-18 | 1969-10-18 | 1970-04-19 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1973-04-18 | 1973-10-18 | 1974-04-19 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1977-04-18 | 1977-10-18 | 1978-04-19 | $7700.00 | Window Closed / Lapsed |