US2773027A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Hollow carboxymethyl cellulose bead and method for making
Assignee: EIDP Inc
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Filing: 1952-05-09
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Granted: 1956-12-04
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Expires: 1972-05-09
Abstract
No abstract record available.
Inventors
- 👤 Powers William Richards
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 07:38
CPC Classifications
C; C08; C08B; C08B11/00; C08B11/20; B; B01; B01D; B01D69/00; B01D69/08; Y; Y10; Y10S; Y10S424/00; Y10S424/07
Claims Analysis
Total Claims: 1
Claim 1
Independent Claim
94 words
A PROCESS FOR THE PREPARATION OF SUBSTANTIALLY SPHERICAL BEADS HAVING AN AQUEOUS CORE WITHIN A SURROUNDING ENVELOPE OF A WATER-INSOLUBLE SALT OF CARBOXYMETHYLCELLULOSE WHICH COMPRISES INTRODUCING INDIVIDUAL DROPS OF AN AQUEOUS SOLUTION OF WATER-SOLUBLE SODIUM CARBOXYMETHYL CELLULOSE INTO AN AQUEOUS SOLUTION OF A METAL SALT, SAID METAL SALT BEING SELECTED FROM THE GROUP CONSISTING OF ALUMINUM, TITANIUM, CHROMIUM, IRON, NICKEL, COPPER, ZINC, ZIRCONIUM, SILVER, TIN AND LEAD SALTS, AND SAID AQUEOUS SOLUTION OF WATER-SOLUBLE CARBOXYMETHYLCELLULOSE HAVING A CONCENTRATION IN THE RANGE OF FROM ABOUT 1% TO ABOUT 15%, BY WEIGHT, IF THE CELLULOSE ETHER.
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) | 1959-12-04 | 1960-06-04 | 1960-12-04 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1963-12-04 | 1964-06-04 | 1964-12-04 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1967-12-04 | 1968-06-04 | 1968-12-04 | $7700.00 | Window Closed / Lapsed |