US4584188A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Hydrogels
Assignee: BTG International Ltd
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Filing: 1984-12-03
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Granted: 1986-04-22
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Expires: 2004-12-03
Abstract
Abstract A hydrogel which comprises polymerized moieties derivable from (i) at least one polymerizable cyclic (thio)ether and (ii) at least one hydrophilic homo- or copolymer.
Inventors
- 👤 Neil B. Graham
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-27 21:18
CPC Classifications
C; C08; C08G; C08G75/00; C08G75/02; C08G75/06; A; A01; A01N; A01N25/00; A01N25/08; A01N25/10; A61; A61K; A61K9/00; A61K9/20; A61K9/2004; A61K9/2022; A61K9/2031; A61L; A61L15/00; A61L15/16; A61L15/22; A61L15/42; A61L15/60; C08G65/00; C08G65/02; C08G65/04; C08G65/06; C08G65/16
Claims Analysis
Total Claims: 13
Claim 1
Independent Claim
39 words
A controlled release composition which comprises: (a) an active substance, and (b) a carrier therefor comprising a hydrogel comprising polymerised moieties derivable from (i) at least one polymerisable cyclic (thio)ether and (ii) at least one hydrophilic homo- or copolymer.
Claim 2
Dependent Claim
39 words
A controlled release composition which comprises: (a) an active substance, and (b) a carrier therefor comprising a hydrogel comprising polymerised moieties derivable from (i) at least one polymerisable cyclic (thio)ether and (ii) at least one hydrophilic homo- or copolymer.
Claim 3
Dependent Claim
16 words
A controlled release composition according to claim 1 wherein the active substance comprises a medication system.
Claim 4
Dependent Claim
62 words
The controlled release composition according to claim 1 wherein the medication system comprises a compound selected from the group consisting of a hypnotic, a sedative a tranquilizer, an anti-pyretic, an anti-inflammatory agent an anti-histamine, an anti-tussive, an agent for the treatment of malignant neoplastia, a topical or dermatological agent, a diuretic agent, an anti-depressant, an anti-fungal agent, a steroid and an analgesic.
Claim 5
Dependent Claim
17 words
The controlled release composition according to claim 1 in the shape of a cylinder, film or slab.
Claim 6
Dependent Claim
31 words
The controlled release composition according to claim 1 wherein the cylinder is hollow or the film or slab has one or more holes or hollows therein to modify the release properties.
Claim 7
Dependent Claim
32 words
A controlled release composition according to claim 1 wherein the active substance comprises a compound selected from the group consisting of a fungicide, an algaecide a herbicide, a nematocide, and an insecticide.
Claim 8
Dependent Claim
16 words
A controlled release composition according to claim 1 wherein the active substance comprises a polymerisation inhibitor.
Claim 9
Dependent Claim
55 words
A process for the preparation of a controlled release composition according to claim 1 which comprises (a) fabricating a hydrogel as defined in claim 1 in any desired form; (b) contacting the hydrogel with a solution of an active substance and permitting it to swell therein; and (c) removing the swollen hydrogel from the solution.
Claim 10
Dependent Claim
28 words
The process according to claim 8 wherein the permitted swelling of the hydrogel is from 200 to 700 parts by volume per hundred of the initial dry volume.
Claim 11
Dependent Claim
20 words
The process according to claim 8 wherein the swelling is effected at a temperature from -20° C. to +20° C.
Claim 12
Dependent Claim
52 words
A method of controlled administration to a human or non-human animal patient of a biologically active substance other than a prostagland in which comprises (a) incorporating the active substance into a controlled release composition according to claim 1; and (b) applying the composition to the part of the patient to be treated.
Claim 13
Dependent Claim
22 words
The process of claim 8 further comprising: (d) drying the swollen hydrogen, thereby providing a controlled release composition comprising the active substance.
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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) | 1989-04-21 | 1989-10-21 | 1990-04-22 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1993-04-21 | 1993-10-21 | 1994-04-22 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1997-04-21 | 1997-10-21 | 1998-04-22 | $7700.00 | Window Closed / Lapsed |