US3129133A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Colloidal dispersions of partially cured polyepoxides, their preparation and use for preparing wet strength paper
Assignee: Shell USA Inc
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Filing: 1960-04-21
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Granted: 1964-04-14
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Expires: 1980-04-21
Abstract
No abstract record available.
Inventors
- 👤 Marshall E Doyle
- 👤 Jr Melvin E Nicholsen
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-24 07:59
CPC Classifications
C; C08; C08J; C08J3/00; C08J3/02; C08J3/03; C08G; C08G59/00; C08G59/18; C08G59/40; C08G59/50; C08G59/5006; C08G59/502; D; D21; D21H; D21H17/00; D21H17/20; D21H17/33; D21H17/46; D21H17/52; C08J2363/00; Y; Y10; Y10T; Y10T428/00; Y10T428/31504; Y10T428/31511
Claims Analysis
Total Claims: 1
Claim 1
Independent Claim
73 words
A PROCESS FOR PREPARING PAPER HAVING IMPROVED WET STRENGTH WHICH COMPRISES APPLYING AT SOME TIME DURING THE PRODUCTION OF PAPER FROM PAPER PULP TO FINISHED PAPER TO THE PAPER PRODUCT PRESENT AT THAT STAGE AN AQUEOUS COLLOIDAL DISPERSION OF A REACTION PRODUCT OF A POLYEPOXIDE HAVING MORE THAN ONE VIC-EPOXY GROUP AND A POLYFUNCTIONAL EPOXY CURING AGENT WHICH REACTION PRODUCT IS FREE OF GEL, AND THEN HEATING TO EFFECT CURE OF THE POLYEPOXIDE.
References Cited (Backward Citations)
US2707708A
Cited
US2801229A
Cited
US2844552A
Cited
US2909448A
Cited
US2913356A
Cited
US2928808A
Cited
US2912389A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1967-04-14 | 1967-10-14 | 1968-04-14 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1971-04-14 | 1971-10-14 | 1972-04-14 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1975-04-14 | 1975-10-14 | 1976-04-14 | $7700.00 | Window Closed / Lapsed |