US3049433A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Stabilized cellulose derivatives and process
Assignee: Hercules Powder Co
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Filing: 1960-03-21
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Granted: 1962-08-14
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Expires: 1980-03-21
Abstract
No abstract record available.
Inventors
- 👤 Robert W Butler
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 19:38
CPC Classifications
C; C09; C09D; C09D101/00; C09D101/08; C09D101/26; C08; C08K; C08K3/00; C08K3/01; C08K3/014
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
101 words
PROCESS OF MAKING FILMS OF IMPROVED RESISTANCE TO BECOMING DISCOLORED WHICH COMPRISES PREPARING A SOLUTION BY DISSOLVING IN WATER (1) A WATER SOLUBLE CELLULOSE ETHER SELECTED FROM THE GROUP CONSISTING OF ALKYL, CARBOXYALKYL, HYDROXYALKYL, ALKYL HYDROXYALKYL AND CARBOXYALKYL HYDROXYALKYL ETHERS AND, (2) A WATER SOLUBLE STABILIZER SELECTED FROM THE GROUP CONSISTING OF MONOSODIUM PHOSPHATE, DISODIUM PHOSPHATE, CALCIUM CHLORIDE, MAGNESIUM SULFATE, POTASSIUM CITRATE, MONOPOTASSIUM PHOSPHATE, MAGNESIUM P-TOLUENE SULFONATE, ALUMINUM SULFATE, BARIUM CHLORIDE, CALCIUM NITRATE AND MAGNESIUM CHLORIDE, THE AMOUNT OF STABILIZER BIENG AT LEAST 1.0% BY WEIGHT OF THE CELLULOSE ETHER EMPLOYED, CASTING FILMS FROM SAID SOLUTION, AND SUBSTANTIALLY DRYING THE FILMS.
Claim 2
Dependent Claim
101 words
PROCESS OF MAKING FILMS OF IMPROVED RESISTANCE TO BECOMING DISCOLORED WHICH COMPRISES PREPARING A SOLUTION BY DISSOLVING IN WATER (1) A WATER SOLUBLE CELLULOSE ETHER SELECTED FROM THE GROUP CONSISTING OF ALKYL, CARBOXYALKYL, HYDROXYALKYL, ALKYL HYDROXYALKYL AND CARBOXYALKYL HYDROXYALKYL ETHERS AND, (2) A WATER SOLUBLE STABILIZER SELECTED FROM THE GROUP CONSISTING OF MONOSODIUM PHOSPHATE, DISODIUM PHOSPHATE, CALCIUM CHLORIDE, MAGNESIUM SULFATE, POTASSIUM CITRATE, MONOPOTASSIUM PHOSPHATE, MAGNESIUM P-TOLUENE SULFONATE, ALUMINUM SULFATE, BARIUM CHLORIDE, CALCIUM NITRATE AND MAGNESIUM CHLORIDE, THE AMOUNT OF STABILIZER BIENG AT LEAST 1.0% BY WEIGHT OF THE CELLULOSE ETHER EMPLOYED, CASTING FILMS FROM SAID SOLUTION, AND SUBSTANTIALLY DRYING THE FILMS.
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) | 1965-08-13 | 1966-02-12 | 1966-08-14 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1969-08-13 | 1970-02-12 | 1970-08-14 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1973-08-13 | 1974-02-12 | 1974-08-14 | $7700.00 | Window Closed / Lapsed |