US2782190A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Depolymerized algineic acid derivatives
Assignee: Individual
•
Filing: 1952-03-08
•
Granted: 1957-02-19
•
Expires: 1972-03-08
Abstract
No abstract record available.
Inventors
- 👤 Karl A Fischer
- 👤 Sydow Herbert
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-02 15:11
CPC Classifications
C; C09; C09K; C09K8/00; C09K8/02; C09K8/03; C09K8/035; C08; C08B; C08B37/00; C08B37/006; C08B37/0084
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
76 words
A PROCESS OF PREPARING PARTI ALLY DEPOLYMERIZED ALGANIC ACID DERIVCTIVES COMPRISING THE STEPS OF TREATING AT A RAISED TEMPERATURE AN AQUEOUS SOLUTION OF A WATERSOLUBLE ALKALI METAL SALT OF ALGANIC ACID HAVING A PH OF LESS THAN 7 WITH A REDUCING AGENT WHICH DOES BOT REACT CHEMICALLY TO FORM DERIVATIVES OF ALGINIC ACID SO AS TO PARTIALLY DEPOLYMERIZE SAID ALKALI METAL SALT OF ALGINIC ACID; AND COLLECTING SAID PARTIALLY DEPOLYMERIZED ALKALI METAL SALT OF ALGINIC ACID.
Claim 2
Dependent Claim
76 words
A PROCESS OF PREPARING PARTI ALLY DEPOLYMERIZED ALGANIC ACID DERIVCTIVES COMPRISING THE STEPS OF TREATING AT A RAISED TEMPERATURE AN AQUEOUS SOLUTION OF A WATERSOLUBLE ALKALI METAL SALT OF ALGANIC ACID HAVING A PH OF LESS THAN 7 WITH A REDUCING AGENT WHICH DOES BOT REACT CHEMICALLY TO FORM DERIVATIVES OF ALGINIC ACID SO AS TO PARTIALLY DEPOLYMERIZE SAID ALKALI METAL SALT OF ALGINIC ACID; AND COLLECTING SAID PARTIALLY DEPOLYMERIZED ALKALI METAL SALT OF ALGINIC ACID.
References Cited (Backward Citations)
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Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1960-02-19 | 1960-08-20 | 1961-02-19 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1964-02-19 | 1964-08-20 | 1965-02-19 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1968-02-19 | 1968-08-20 | 1969-02-19 | $7700.00 | Window Closed / Lapsed |