US2635972A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Coated paper and process for making same
Assignee: Hercules Powder Co
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Filing: 1950-02-03
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Granted: 1953-04-21
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Expires: 1970-02-03
Abstract
No abstract record available.
Inventors
- 👤 Julian L Azorlosa
- 👤 Hug Donald Paul
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 23:45
CPC Classifications
D; D21; D21H; D21H17/00; D21H17/20; D21H17/21; D21H17/24; D21H17/25; D21H17/26; Y; Y10; Y10S; Y10S8/00; Y10S8/17; Y10T; Y10T428/00; Y10T428/31504; Y10T428/31971; Y10T428/31975; Y10T428/31978; Y10T428/31982
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
58 words
A FELTED FIBROUS MATERIAL OF IMPROVED PROPERTIES COMPRISING CELLULOSIC PAPERMAKING FIBERS AND A WATER-SOLUBLE SALT OF A CARBOXYALKYL HYDROXYALKYL CELLULOSE, SAID SALT BEING SOLUBLE IN WATER TO THE EXTEND OF AT LEAST 1%, SAID CARBOXYALKYL HYDROXYALKYL CELLULOSE HAVING A CARBOXYALKYL SUBSTITUTION OF FROM 0.05 TO 0.5 CARBOXYALKYL GROUP AND FROM 0.2 TO 0.7 HYDROXYALKYL GROUP PER ANHYDROGLUCOSE UNIT.
Claim 2
Dependent Claim
58 words
A FELTED FIBROUS MATERIAL OF IMPROVED PROPERTIES COMPRISING CELLULOSIC PAPERMAKING FIBERS AND A WATER-SOLUBLE SALT OF A CARBOXYALKYL HYDROXYALKYL CELLULOSE, SAID SALT BEING SOLUBLE IN WATER TO THE EXTEND OF AT LEAST 1%, SAID CARBOXYALKYL HYDROXYALKYL CELLULOSE HAVING A CARBOXYALKYL SUBSTITUTION OF FROM 0.05 TO 0.5 CARBOXYALKYL GROUP AND FROM 0.2 TO 0.7 HYDROXYALKYL GROUP PER ANHYDROGLUCOSE UNIT.
References Cited (Backward Citations)
GB491488A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1956-04-20 | 1956-10-20 | 1957-04-21 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1960-04-20 | 1960-10-20 | 1961-04-21 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1964-04-20 | 1964-10-20 | 1965-04-21 | $7700.00 | Window Closed / Lapsed |