Patent US2903391A successfully refreshed from Google Patents.
US2903391A
Expired / Lapsed
US
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Paper size and method of preparation
Assignee: Unilever Bestfoods North America
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Filing: 1957-10-09
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Granted: 1959-09-08
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Expires: 1977-10-09
Abstract
No abstract record available.
Inventors
- 👤 Ralph W Kerr
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-30 07:14
CPC Classifications
D; D21; D21H; D21H17/00; D21H17/20; D21H17/21; D21H17/24; D21H17/28
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
89 words
THE PROCESS OF SIZING PAPER PULP WHICH COMPRISES ADDING TO THE PULP AT A STAGE IN THE MANUFACTURE OF PAPER PRIOR TO FORMATION OF THE PAPER WEB, AT LEAST ABOUT 0.03 PERCENT OF A STARC ETHER, BASED ON DRY WEIGHT OF ETHER AND PULP, WHICH HAS BEEN GELATINIZED AND DRIED IN CONTACT WITH ABOUT 0.25 TO 15 PERCENT OF BORAX, BASED ON THE DRY WEIGHT OF THE STARCH ETHER; SAID ETHER BEING FROM THE GROUP CONSISTING OF HYDROXYETHYL AND HYDOXYPROPYL CORN STARCH AND HYDROXYETHYL AND HYDROXYPROPYL GRAIN SORGHUM STARCH.
Claim 2
Dependent Claim
89 words
THE PROCESS OF SIZING PAPER PULP WHICH COMPRISES ADDING TO THE PULP AT A STAGE IN THE MANUFACTURE OF PAPER PRIOR TO FORMATION OF THE PAPER WEB, AT LEAST ABOUT 0.03 PERCENT OF A STARC ETHER, BASED ON DRY WEIGHT OF ETHER AND PULP, WHICH HAS BEEN GELATINIZED AND DRIED IN CONTACT WITH ABOUT 0.25 TO 15 PERCENT OF BORAX, BASED ON THE DRY WEIGHT OF THE STARCH ETHER; SAID ETHER BEING FROM THE GROUP CONSISTING OF HYDROXYETHYL AND HYDOXYPROPYL CORN STARCH AND HYDROXYETHYL AND HYDROXYPROPYL GRAIN SORGHUM STARCH.
References Cited (Backward Citations)
US2171796A
Cited
US2733238A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1962-09-07 | 1963-03-09 | 1963-09-08 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1966-09-07 | 1967-03-09 | 1967-09-08 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1970-09-07 | 1971-03-09 | 1971-09-08 | $7700.00 | Window Closed / Lapsed |