US3892731A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Solvents for and purification of chitin
Assignee: University of Delaware
•
Filing: 1973-11-23
•
Granted: 1975-07-01
•
Expires: 1993-11-23
Abstract
Abstract New solvents for chitin are described comprising a chloracetic acid alone or in combination with other solvents, and a method for purifying the chitin and regenerating it in the form of crystalline fibrils.
Inventors
- 👤 Paul Rolland Austin
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-24 23:56
CPC Classifications
C; C08; C08B; C08B37/00; C08B37/0006; C08B37/0024; C08B37/0027; C08B37/003; Y; Y10; Y10S; Y10S516/00; Y10S516/01; Y10S516/07
Claims Analysis
Total Claims: 4
Claim 1
Independent Claim
9 words
A SOLUTION OF CHITIN IN DI- OR TRI-CHLORACETIC ACID.
Claim 2
Dependent Claim
9 words
A SOLUTION OF CHITIN IN DI- OR TRI-CHLORACETIC ACID.
Claim 3
Dependent Claim
4 words
Regenerated crystalline fibrillar chitin.
Claim 4
Dependent Claim
4 words
Regenerated crystalline fibrillar chitin.
References Cited (Backward Citations)
US3089821A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1978-06-30 | 1978-12-30 | 1979-07-01 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1982-06-30 | 1982-12-30 | 1983-07-01 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1986-06-30 | 1986-12-30 | 1987-07-01 | $7700.00 | Window Closed / Lapsed |