US2816887A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Lower fatty acid acylation of cellulose and catalyst therefor
Assignee: HEREULES POWDER Co
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Filing: 1953-04-03
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Granted: 1957-12-17
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Expires: 1973-04-03
Abstract
No abstract record available.
Inventors
- 👤 Bayard T Lamborn
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-08 10:09
CPC Classifications
C; C08; C08B; C08B3/00; C08B3/02
Claims Analysis
Total Claims: 4
Claim 1
Independent Claim
83 words
IN A PROCESS FOR THE PREPARATION OF LOWER FATTY ACID ESTERS OF CELLULOSE, THE IMPROVEMENT COMPRISING REATCING CELLULOSE WITH A MIXTURE OF ANHYDROUS LOWER FATTY ACID AND LOWER FATTY ACID ANHYDRIDE IN THE PRESENCE OF A CATALYTIC AMOUNT OF ABOUT 1/4% TO ABOUT 8%, BASED ON SAID CELLULOSE, OF NONCOMBINING ACYLATION CATALYST CONSISTING ESSENTIALLY OF MIXTURES OF ZINC PERCHLORATE AND P-TOLUENESULFONIC ACID, THE RATIO OF P-TOLUENESULFONIC ACID TO ZINC PERCHLORATE BEING BETWEEN ABOUT 9 TO 1 AND ABOUT 1 TO 9 BY WEIGHT.
Claim 2
Dependent Claim
83 words
IN A PROCESS FOR THE PREPARATION OF LOWER FATTY ACID ESTERS OF CELLULOSE, THE IMPROVEMENT COMPRISING REATCING CELLULOSE WITH A MIXTURE OF ANHYDROUS LOWER FATTY ACID AND LOWER FATTY ACID ANHYDRIDE IN THE PRESENCE OF A CATALYTIC AMOUNT OF ABOUT 1/4% TO ABOUT 8%, BASED ON SAID CELLULOSE, OF NONCOMBINING ACYLATION CATALYST CONSISTING ESSENTIALLY OF MIXTURES OF ZINC PERCHLORATE AND P-TOLUENESULFONIC ACID, THE RATIO OF P-TOLUENESULFONIC ACID TO ZINC PERCHLORATE BEING BETWEEN ABOUT 9 TO 1 AND ABOUT 1 TO 9 BY WEIGHT.
Claim 3
Dependent Claim
39 words
AS AN ACYLATION CATALYST, A SUBSTANTIALLY ANHYDROUS COMPOSITION CONSISTING ESSENTIALLY OF MIXTURES OF ZINC PERCHLORATE AN P-TOLUENESULFONIC ACID, THE RATIO OF PTOLUENESULFONIC ACID TO ZINC PERCHLORATE BEING BETWEEN ABOUT 9 TO 1 AND ABOUT 1 TO 9 BY WEIGHT.
Claim 4
Dependent Claim
39 words
AS AN ACYLATION CATALYST, A SUBSTANTIALLY ANHYDROUS COMPOSITION CONSISTING ESSENTIALLY OF MIXTURES OF ZINC PERCHLORATE AN P-TOLUENESULFONIC ACID, THE RATIO OF PTOLUENESULFONIC ACID TO ZINC PERCHLORATE BEING BETWEEN ABOUT 9 TO 1 AND ABOUT 1 TO 9 BY WEIGHT.
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) | 1960-12-16 | 1961-06-17 | 1961-12-17 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1964-12-16 | 1965-06-17 | 1965-12-17 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1968-12-16 | 1969-06-17 | 1969-12-17 | $7700.00 | Window Closed / Lapsed |