US2771464A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Novel sizing agents for paper
Assignee: Wyeth Holdings LLC
•
Filing: 1953-06-03
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Granted: 1956-11-20
•
Expires: 1973-06-03
Abstract
No abstract record available.
Inventors
- 👤 Hastings Randall
- 👤 Erhard K Drechsel
- 👤 Strazdins Edward
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-26 09:22
CPC Classifications
D; D21; D21H; D21H17/00; D21H17/62
Claims Analysis
Total Claims: 4
Claim 1
Independent Claim
82 words
A FORTIFYING AGENT FOR ROSIN SIZE, CONSISTING ESSENTIALLY OF THE DIELS-ALDER REACTION PRODUCT OF (A) ROSIN, (B) A MATERIAL SELECTED FROM THE GROUP CONSISTING OF MALEIC ANHYDRIDE, MALEIC ACID, AND FUMARIC ACID, AND (C) DEHYDRATED CITRIC ACID IN MOLAR RATIO BETWEEN ABOUT 10:8.5:1.5 AND ABOUT 10:5.5 RESPECTIVELY, SAID AGENT BEING AT LEAST PARTLY NEUTRALIZED WITH AN ALKALI METAL ALKALI SAID DEHYDRATED CITRIC ACID CORRESPONDING TO THE PRODUCT OBTAINED BY HEATING CITRIC ACID AT A TEMPERATURE BETWEEN ABOUT 175* C. AND 200* C.
Claim 2
Dependent Claim
82 words
A FORTIFYING AGENT FOR ROSIN SIZE, CONSISTING ESSENTIALLY OF THE DIELS-ALDER REACTION PRODUCT OF (A) ROSIN, (B) A MATERIAL SELECTED FROM THE GROUP CONSISTING OF MALEIC ANHYDRIDE, MALEIC ACID, AND FUMARIC ACID, AND (C) DEHYDRATED CITRIC ACID IN MOLAR RATIO BETWEEN ABOUT 10:8.5:1.5 AND ABOUT 10:5.5 RESPECTIVELY, SAID AGENT BEING AT LEAST PARTLY NEUTRALIZED WITH AN ALKALI METAL ALKALI SAID DEHYDRATED CITRIC ACID CORRESPONDING TO THE PRODUCT OBTAINED BY HEATING CITRIC ACID AT A TEMPERATURE BETWEEN ABOUT 175* C. AND 200* C.
Claim 3
Dependent Claim
92 words
A FORITIFED SIZE CONSISTING ESSENTIALLY OF A MINOR PROPORTION OF THE DIELS-ALDER REACTION PRODUCT OF (A) ROSIN, (B) A MATERIAL SELECTED FROM THE GROUP CONSISTING OF MALEIC ANHYDRIC, MALEIC ACID, AND FUMARIC ACID; AND (C) DEHYDRATED CITRIC ACID IN MOLAR RATIO BETWEEN ABOUT 10:8.5:1.5 AND 10:5:5 RESPECTIVELY, AND A MAJOR PROPORTION OF ROSIN, SAID REACTION PRODUCT AND SAID ROSIN BEING AT LEAST PARTLY NEUTRALIZED WITH AN ALKALI METAL ALKALI SAID DEHYDRATED CITRIC ACID CORRESPONDING TO THE PRODUCT OBTAINED BY HEATING CITRIC ACID AT A TEMPERATURE BETWEEN ABOUT 175* C. AND 200* C.
Claim 4
Dependent Claim
92 words
A FORITIFED SIZE CONSISTING ESSENTIALLY OF A MINOR PROPORTION OF THE DIELS-ALDER REACTION PRODUCT OF (A) ROSIN, (B) A MATERIAL SELECTED FROM THE GROUP CONSISTING OF MALEIC ANHYDRIC, MALEIC ACID, AND FUMARIC ACID; AND (C) DEHYDRATED CITRIC ACID IN MOLAR RATIO BETWEEN ABOUT 10:8.5:1.5 AND 10:5:5 RESPECTIVELY, AND A MAJOR PROPORTION OF ROSIN, SAID REACTION PRODUCT AND SAID ROSIN BEING AT LEAST PARTLY NEUTRALIZED WITH AN ALKALI METAL ALKALI SAID DEHYDRATED CITRIC ACID CORRESPONDING TO THE PRODUCT OBTAINED BY HEATING CITRIC ACID AT A TEMPERATURE BETWEEN ABOUT 175* C. AND 200* C.
References Cited (Backward Citations)
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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) | 1959-11-20 | 1960-05-21 | 1960-11-20 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1963-11-20 | 1964-05-21 | 1964-11-20 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1967-11-20 | 1968-05-21 | 1968-11-20 | $7700.00 | Window Closed / Lapsed |