US2913356A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Preparation of paper having improved wet strength
Assignee: Shell Development Co
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Filing: 1955-06-28
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Granted: 1959-11-17
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Expires: 1975-06-28
Abstract
No abstract record available.
Inventors
- 👤 Carl W Schroeder
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 19:20
CPC Classifications
D; D21; D21H; D21H17/00; D21H17/20; D21H17/33; D21H17/46; D21H17/52; C; C08; C08G; C08G59/00; C08G59/18; C08G59/182; C08G59/184; C08G59/40; C08J; C08J3/00; C08J3/20; C08J3/205; C08J2363/00
Claims Analysis
Total Claims: 1
Claim 1
Independent Claim
61 words
A PROCESS FOR PREPARING PAPER HAVING IMPROVED WET STRENGTH WHICH COMPRISES IMPREGNATING ALREADY FORMED PAPER WITH AN AQUEOUS MEDIUM CONTAINING A POLYETHER POLYEPOXIDE AND AN EPOXY CURING AGENT SO AS TO APPLY TO THE PAPER FROM 1% TO 20% BY WEIGHT OF THE PAPER OF THE SAID POLYETHER POLYEPOXIDE AND HEATING AT A TEMPERATURE BETWEEN 100*C. AND 200*C. TO EFFECT CURE.
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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) | 1962-11-16 | 1963-05-18 | 1963-11-17 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1966-11-16 | 1967-05-18 | 1967-11-17 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1970-11-16 | 1971-05-18 | 1971-11-17 | $7700.00 | Window Closed / Lapsed |