Patent US2584508A successfully refreshed from Google Patents.
US2584508A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Production of compounds of alginic acid and its derivatives
Assignee: Alginate Industries Ltd
•
Filing: 1948-04-22
•
Granted: 1952-02-05
•
Expires: 1968-04-22
Abstract
No abstract record available.
Inventors
- 👤 Speakman John Bamber
- 👤 Chamberlain Norman Henry
- 👤 Dorkin Catherine Marga Cameron
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-28 09:16
CPC Classifications
D; D06; D06M; D06M13/00; D06M13/322; D06M13/395
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
64 words
A PROCESS FOR THE PRODUCTION OF ALKALI-RESISTANT ALGINIC MATERIAL, WHICH COMPRISES FIRST SWELLING IN WATER ALGINIC MATERIAL OF THE GROUP CONSISTING OF ALGINIC ACID AND WATER-INSOLUBLE METAL ALGINATES, THEN DISPLACING THE WATER BY A POLAR SOLVENT WHICH MAINTAINS SUFFICIENT SWELLING TO KEEP THE HYDROXYL GROUPS ACCESSIBLE, AND THEREAFTER BRINGING ABOUT CROSS-LINKING BY TREATMENT WITH A SOLUTION OF HEXAMETHYLENE DIISOCYANATE IN A NON-REACTIVE POLAR SOLVENT.
Claim 2
Dependent Claim
64 words
A PROCESS FOR THE PRODUCTION OF ALKALI-RESISTANT ALGINIC MATERIAL, WHICH COMPRISES FIRST SWELLING IN WATER ALGINIC MATERIAL OF THE GROUP CONSISTING OF ALGINIC ACID AND WATER-INSOLUBLE METAL ALGINATES, THEN DISPLACING THE WATER BY A POLAR SOLVENT WHICH MAINTAINS SUFFICIENT SWELLING TO KEEP THE HYDROXYL GROUPS ACCESSIBLE, AND THEREAFTER BRINGING ABOUT CROSS-LINKING BY TREATMENT WITH A SOLUTION OF HEXAMETHYLENE DIISOCYANATE IN A NON-REACTIVE POLAR SOLVENT.
References Cited (Backward Citations)
US2266777A
Cited
US2284896A
Cited
US2319168A
Cited
US2374136A
Cited
US2317492A
Cited
US2339913A
Cited
US2403707A
Cited
US2409319A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1955-02-04 | 1955-08-06 | 1956-02-05 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1959-02-04 | 1959-08-06 | 1960-02-05 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1963-02-04 | 1963-08-06 | 1964-02-05 | $7700.00 | Window Closed / Lapsed |