Patent US4096326A successfully refreshed from Google Patents.
US4096326A
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Dihydroxypropyl cellulose
Assignee: Aqualon Co
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Filing: 1976-10-13
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Granted: 1978-06-20
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Expires: 1996-10-13
Abstract
Abstract Dihydroxypropyl ethers of cellulose are disclosed which are characterized by having a dihydroxypropyl M.S. of at least about 1.4 which are water-soluble and thermoplastic. These materials form complexes with borate and antimonate ions having unique and useful properties.
Inventors
- 👤 Albert R. Reid
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-01 23:27
CPC Classifications
C; C09; C09K; C09K8/00; C09K8/02; C09K8/04; C09K8/06; C09K8/08; C09K8/10; C06; C06B; C06B47/00; C06B47/14; C08; C08B; C08B11/00; C08B11/02; C08B11/04; C08B11/08; C08B11/193; C08K; C08K3/00; C08K3/18; C08K3/24; C08K3/38; C09D; C09D7/00; C09D7/40; C09D7/43
Claims Analysis
Total Claims: 6
Claim 1
Independent Claim
29 words
An ether of cellulose having at least about 1.4 dihydroxypropyl units per anhydroglucose unit, said ether of cellulose being characterized by being soluble in water and by being thermoplastic.
Claim 2
Dependent Claim
29 words
An ether of cellulose having at least about 1.4 dihydroxypropyl units per anhydroglucose unit, said ether of cellulose being characterized by being soluble in water and by being thermoplastic.
Claim 3
Dependent Claim
30 words
The cellulose ether claim 1 wherein the dihydroxypropyl radical is the sole substituent on said cellulose and is present in amount of about 1.4 to 6 moles per anhydroglucose unit.
Claim 4
Dependent Claim
24 words
The reaction product of a cellulose ether of claim 2 and about 0.05 to 4 part by weight of potassium pyroantimonate per part thereof.
Claim 5
Dependent Claim
69 words
A mixed ether of cellulose having at least about 1.4 dihydroxypropyl units per anhydroglucose unit and a second substituent selected from the class consisting of (a) carboxymethyl units at a level of about 0.01 to about 1.8 per anhydroglucose unit; (b) hydroxyethyl units at a level of about 0.01 to 5 per anhydroglucose unit; and (c) hydroxypropyl units at a level of about 0.01 to 8 per anhydroglucose unit.
Claim 6
Dependent Claim
69 words
A mixed ether of cellulose having at least about 1.4 dihydroxypropyl units per anhydroglucose unit and a second substituent selected from the class consisting of (a) carboxymethyl units at a level of about 0.01 to about 1.8 per anhydroglucose unit; (b) hydroxyethyl units at a level of about 0.01 to 5 per anhydroglucose unit; and (c) hydroxypropyl units at a level of about 0.01 to 8 per anhydroglucose unit.
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USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1981-06-19 | 1981-12-19 | 1982-06-20 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1985-06-19 | 1985-12-19 | 1986-06-20 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1989-06-19 | 1989-12-19 | 1990-06-20 | $7700.00 | Window Closed / Lapsed |