Patent US3597769A successfully refreshed from Google Patents.
Patent US3058873A successfully refreshed from Google Patents.
US3058873A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Manufacture of paper having improved wet strength
Assignee: Hercules Powder Co
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Filing: 1958-09-10
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Granted: 1962-10-16
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Expires: 1978-09-10
Abstract
No abstract record available.
Inventors
- 👤 Gerald I Keim
- 👤 Alfred C Schmalz
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-26 19:37
CPC Classifications
D; D21; D21H; D21H17/00; D21H17/20; D21H17/21; D21H17/24; D21H17/28; D21H17/29; D21H17/25; D21H17/26; D21H17/33; D21H17/46; D21H17/54; D21H17/55; D21H21/00; D21H21/14; D21H21/18; D21H21/20
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
99 words
A PROCESS FOR THE PRODUCTION OF PAPER HAVING IMPROVED WET STRENGTH WHICH COMPRISES INCORPORATING THEREIN A CATIONIC RESIN AND A WATER-SOLUBLE GUM SELECTED FROM THE GROUP CONSISTING OF (1) WATER-SOLUBLE CELLULOSE ETHERS AND (2) CATIONIC STARCHES, SAID RESIN COMPRISING A WATERSOLUBLE REACTION PRODUCT OF EPICHLOROHYDRIN AND A POLYAMIDE OBTAINED BY HEATING TOGETHER A C3-C10 SATURATED ALIPHATIC DICARBOXYLIC ACID AND FROM ABOUT 0.8 TO ABOUT 1.4 MOLES, PER MOLE OF DISCARBOXYLIC ACID, OF A POLYALKYLENE POLYAMINE, SAID POLYAMIDE CONTAINING SECONDARY AMINE GROUPS, THE RATIO OF EPICHLOROHYDRIN TO SECONDARYY AMINE GROUPS OF SAID POLYAMIDE BEING FROM ABOUT 0.5:1 TO ABOUT 1.8:1.
Claim 2
Dependent Claim
99 words
A PROCESS FOR THE PRODUCTION OF PAPER HAVING IMPROVED WET STRENGTH WHICH COMPRISES INCORPORATING THEREIN A CATIONIC RESIN AND A WATER-SOLUBLE GUM SELECTED FROM THE GROUP CONSISTING OF (1) WATER-SOLUBLE CELLULOSE ETHERS AND (2) CATIONIC STARCHES, SAID RESIN COMPRISING A WATERSOLUBLE REACTION PRODUCT OF EPICHLOROHYDRIN AND A POLYAMIDE OBTAINED BY HEATING TOGETHER A C3-C10 SATURATED ALIPHATIC DICARBOXYLIC ACID AND FROM ABOUT 0.8 TO ABOUT 1.4 MOLES, PER MOLE OF DISCARBOXYLIC ACID, OF A POLYALKYLENE POLYAMINE, SAID POLYAMIDE CONTAINING SECONDARY AMINE GROUPS, THE RATIO OF EPICHLOROHYDRIN TO SECONDARYY AMINE GROUPS OF SAID POLYAMIDE BEING FROM ABOUT 0.5:1 TO ABOUT 1.8:1.
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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) | 1965-10-15 | 1966-04-16 | 1966-10-16 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1969-10-15 | 1970-04-16 | 1970-10-16 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1973-10-15 | 1974-04-16 | 1974-10-16 | $7700.00 | Window Closed / Lapsed |