US2865854A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Method of reducing b. o. d. of starch bearing effluent by addition of substituted cellulose to effluent
Assignee: Hercules Powder Co
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Filing: 1955-06-16
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Granted: 1958-12-23
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Expires: 1975-06-16
Abstract
No abstract record available.
Inventors
- 👤 Walter J Sweet
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-01 15:13
CPC Classifications
C; C02; C02F; C02F1/00; C02F1/52; C02F1/54; C02F1/5263
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
91 words
IN A PROCESS WHEREIN STARCH IS EMPLOYED AS A TREATING AGENT AND WHEREIN AN EFFLUENT FROM SAID PROCESS CONTAINING STARCH IS DISCHARGED INTO A BODY OF WATER THEREBY INCREASING THE BIOCHEMICAL OXYGEN DEMAND OF SAID BODY OF WATER, THE IMPROVEMENT WHICH COMPRISES INCORPORATING IN SAID BODY OF WATER A WATER-SOLUBLE CELLULOSE ETHER IN AN AMOUNT SUFFICIENT TO GIVE AN ETHER/STARCH RATIO OF 20/80-65/35, SAID ETHER CONTAINING SUBSTITUENT GROUPS SELECTED FROM THE CLASS CONSISTING OF CARBOXYALKYL AND HYDROXYALKYL SUBSTIUENT GROUP IN AN AMOUNT OF AT LEAST 0.3 SUBSTITUENT GROUP PER ANHYDROGLUCOSE UNIT.
Claim 2
Dependent Claim
91 words
IN A PROCESS WHEREIN STARCH IS EMPLOYED AS A TREATING AGENT AND WHEREIN AN EFFLUENT FROM SAID PROCESS CONTAINING STARCH IS DISCHARGED INTO A BODY OF WATER THEREBY INCREASING THE BIOCHEMICAL OXYGEN DEMAND OF SAID BODY OF WATER, THE IMPROVEMENT WHICH COMPRISES INCORPORATING IN SAID BODY OF WATER A WATER-SOLUBLE CELLULOSE ETHER IN AN AMOUNT SUFFICIENT TO GIVE AN ETHER/STARCH RATIO OF 20/80-65/35, SAID ETHER CONTAINING SUBSTITUENT GROUPS SELECTED FROM THE CLASS CONSISTING OF CARBOXYALKYL AND HYDROXYALKYL SUBSTIUENT GROUP IN AN AMOUNT OF AT LEAST 0.3 SUBSTITUENT GROUP PER ANHYDROGLUCOSE UNIT.
References Cited (Backward Citations)
US2663989A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1961-12-22 | 1962-06-23 | 1962-12-23 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1965-12-22 | 1966-06-23 | 1966-12-23 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1969-12-22 | 1970-06-23 | 1970-12-23 | $7700.00 | Window Closed / Lapsed |