Patent US2772967A successfully refreshed from Google Patents.
US2772967A
Expired / Lapsed
US
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Sized paper
Assignee: Wyeth Holdings LLC
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Filing: 1954-06-28
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Granted: 1956-12-04
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Expires: 1974-06-28
Abstract
No abstract record available.
Inventors
- 👤 John J Padbury
- 👤 Jr John H Daniel
- 👤 Sewell T Moore
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-30 03:44
CPC Classifications
D; D21; D21H; D21H17/00; D21H17/03; D21H17/05; D21H17/07
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
112 words
PAPER COMPOSED OF CELLULOSIC FIBERS SIZED BY A UNIFORMLY ABSORBENT CONTENT WITHIN THE RANGE OF ABOUT 1% TO 4%, BASED ON THE WEIGHT OF THE FIBERS, OF A PRODUCT CORRESPONDING TO THAT FORMED BY HEATING 1 MOL OF AN AMINE SELECTED FROM THE GROUP CONSISTING OF THE LOWER WATER-INSOLUBLE DIALKANOLAMINES, THE LOWER WATER-SOLUBLE TRIALKANOLAMINES AND MIXTURES THEREOF WITH A SATURATED MONOCARBOXYLIC FATTY ACID OF 16-20 CARBON ATOMS, THE MOLAR EQUIVALENCE RATIO OF SAID FATTY ACID TO THE HYDROXYL GROUPS OF SAID ALKANOLAMINE BEING BETWEEN ABOUT 0.33 AND 1.0, AT AN ESTERIFICATION TEMPERATURE UP TO ABOUT 225* C. UNTIL REACTION OF SAID FATTY ACID WITH SAID ALKANOLAMINE IS AT LEAST ABOUT 50% COMPLETE.
Claim 2
Dependent Claim
112 words
PAPER COMPOSED OF CELLULOSIC FIBERS SIZED BY A UNIFORMLY ABSORBENT CONTENT WITHIN THE RANGE OF ABOUT 1% TO 4%, BASED ON THE WEIGHT OF THE FIBERS, OF A PRODUCT CORRESPONDING TO THAT FORMED BY HEATING 1 MOL OF AN AMINE SELECTED FROM THE GROUP CONSISTING OF THE LOWER WATER-INSOLUBLE DIALKANOLAMINES, THE LOWER WATER-SOLUBLE TRIALKANOLAMINES AND MIXTURES THEREOF WITH A SATURATED MONOCARBOXYLIC FATTY ACID OF 16-20 CARBON ATOMS, THE MOLAR EQUIVALENCE RATIO OF SAID FATTY ACID TO THE HYDROXYL GROUPS OF SAID ALKANOLAMINE BEING BETWEEN ABOUT 0.33 AND 1.0, AT AN ESTERIFICATION TEMPERATURE UP TO ABOUT 225* C. UNTIL REACTION OF SAID FATTY ACID WITH SAID ALKANOLAMINE IS AT LEAST ABOUT 50% COMPLETE.
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) | 1959-12-04 | 1960-06-04 | 1960-12-04 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1963-12-04 | 1964-06-04 | 1964-12-04 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1967-12-04 | 1968-06-04 | 1968-12-04 | $7700.00 | Window Closed / Lapsed |