US4090016A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Carboxylated pullulan and method for producing same
Assignee: Hayashibara Seibutsu Kagaku Kenkyujo KK
•
Filing: 1976-05-24
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Granted: 1978-05-16
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Expires: 1996-05-24
Abstract
Abstract Carboxylated pullulan obtained by oxidizing pullulan with an oxidizing agent is readily soluble in cold water and has favorable film-forming property, yielding a film having high mechanical strengths, high modulus of elasticity and good transparency.
Inventors
- 👤 Kozo Tsuji
- 👤 Masanori Fujimoto
- 👤 Fujio Masuko
- 👤 Tsuneyuki Nagase
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 21:09
CPC Classifications
C; C08; C08B; C08B37/00; C08B37/0006; C08B37/0009; C08B37/0018
Claims Analysis
Total Claims: 3
Claim 1
Independent Claim
22 words
Carboxylated pullulan wherein at least some of the hydroxymethyl groups of the glucose units of the pullulan are converted into carboxyl groups.
Claim 2
Dependent Claim
22 words
Carboxylated pullulan wherein at least some of the hydroxymethyl groups of the glucose units of the pullulan are converted into carboxyl groups.
Claim 3
Dependent Claim
18 words
The carboxylated pullulan according to claim 1, wherein the molecular weight of the pullulan is 10,000 to 5,000,000.
References Cited (Backward Citations)
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Cited
US3516983A
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US3632802A
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US3560480A
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US3720660A
Cited
US3870537A
Cited
US3931146A
Cited
US3960685A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1981-05-15 | 1981-11-14 | 1982-05-16 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1985-05-15 | 1985-11-14 | 1986-05-16 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1989-05-15 | 1989-11-14 | 1990-05-16 | $7700.00 | Window Closed / Lapsed |