Patent US3371208A successfully refreshed from Google Patents.
Patent US4786503A successfully refreshed from Google Patents.
US4786503A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Dosage form comprising parallel lamine
Assignee: Alza Corp
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Filing: 1987-04-06
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Granted: 1988-11-22
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Expires: 2007-04-06
Abstract
Abstract A bilaminated dosage form is disclosed comprising at least 30 weight percent cellulose ether, a first lamina and a second lamina with each lamina comprising a different cellulose ether formulation, and a drug in at least one of the lamina.
Inventors
- 👤 David E. Edgren
- 👤 Judy A. Magruder
- 👤 Gurdish K. Bhatti
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-08 16:55
CPC Classifications
A; A61; A61K; A61K9/00; A61K9/20; A61K9/2004; A61K9/2022; A61K9/205; A61K9/2054; A61K9/2072; A61K9/2086; A61K9/209
Claims Analysis
Total Claims: 32
Claim 1
Independent Claim
132 words
A bilaminated system for delivering a beneficial drug to an environment of use, the bilaminated system comprising: 30 weight percent to 90 weight percent of a cellulose ether composition: said composition comprising a first lamina comprising up to 80 weight percent of a cellulose ether selected from the group of hydroxypropylmethylcellulose ethers comprising a degree of polymerization of about 50 to 1260, a viscosity of about 3 to 100,000 centipoises, and a number average molecular weight of 9,000 to 250,000, and a dosage amount of from 0.05 ng to 5 g of a beneficial drug; and, a second lamina in contacting arrangement with the first lamina, the second lamina comprising up to 50 weight percent of a different cellulose ether composition comprising a hydroxypropylcellulose comprising a hydroxyproxyl content of 7% to 16%.
Claim 2
Dependent Claim
132 words
A bilaminated system for delivering a beneficial drug to an environment of use, the bilaminated system comprising: 30 weight percent to 90 weight percent of a cellulose ether composition: said composition comprising a first lamina comprising up to 80 weight percent of a cellulose ether selected from the group of hydroxypropylmethylcellulose ethers comprising a degree of polymerization of about 50 to 1260, a viscosity of about 3 to 100,000 centipoises, and a number average molecular weight of 9,000 to 250,000, and a dosage amount of from 0.05 ng to 5 g of a beneficial drug; and, a second lamina in contacting arrangement with the first lamina, the second lamina comprising up to 50 weight percent of a different cellulose ether composition comprising a hydroxypropylcellulose comprising a hydroxyproxyl content of 7% to 16%.
Claim 3
Dependent Claim
61 words
The bilaminated system for delivering a beneficial drug to an environment of use according to claim 1, wherein the second lamina comprises up to 80 weight percent of a hydroxypropylmethylcellulose ether comprising a degree of polymerization of about 50 to 1260, a viscosity of about 3 to 100,000 centiposes, and a number average molecular weight of from about 9,000 to 250,000.
Claim 4
Dependent Claim
36 words
The bilaminated system for delivering a beneficial drug to an environment of use according to claim 1, wherein the second lamina comprises a dosage amount of from 0.05 ng to 5 g of a beneficial drug.
Claim 5
Dependent Claim
52 words
The bilaminated system for delivering a beneficial drug to an environment of use according to claim 1, wherein the second lamina comprises a hydroxypropylmethylcellulose ether having a number average molecular weight of from about 9,000 to 250,000 and a dosage amount of from 0.05 ng to 5 g of a beneficial drug.
Claim 6
Dependent Claim
97 words
The bilaminated system for delivering the beneficial drug to the environment of use according to claim 1, wherein the second lamina comprises a hydroxypropylmethylcellulose ether having a number average molecular weight of from about 9,000 to 250,000, a dosage amount of from 0.05 ng to 5 g of a beneficial drug, and wherein the second lamina releases more drug per unit time than the first lamina releases drug per unit time and erodes at a faster rate of erosion than the first lamina when the bilaminated system is in an environment of use comprising an aqueous fluid.
Claim 7
Dependent Claim
58 words
The bilaminated system for delivering the drug to an environment of use according to claim 1, wherein the drug in the first lamina is a member selected from the group consisting of ibuprofen, acetaminophen and codeine; and wherein the second lamina comprises a dosage amount of a drug selected from the group consisting of ibuprofen, acetaminophen and codeine.
Claim 8
Dependent Claim
28 words
The bilaminated system for delivering the beneficial drug to an environment of use according to claim 1, wherein the first lamina comprises more than one different hydropropylmethylcellulose ether.
Claim 9
Dependent Claim
125 words
A bilaminated system for delivering a beneficial drug to an environment of use, the bilaminated system comprising: (a) a cellulose ether composition comprising: (b) a first lamina comprising up to 80 weight percent of a cellulose ether selected from the group consisting of hydroxypropylmethylcellulose ethers comprising a degree of polymerization of 40 to 1600, a viscosity of 2 to 225,000 and a number average molecular weight of 9,000 to 307,200; and (c) a second lamina in parallel mated relation with the first lamina, the second lamina comprising up to 50 weight percent of a cellulose ether composition comprising a hydroxypropylcellulose comprising a hydroxypropoxyl content of 7 percent to 16 percent, and a dosage unit amount of 25 ng to 1.5 g of a beneficial drug.
Claim 10
Dependent Claim
125 words
A bilaminated system for delivering a beneficial drug to an environment of use, the bilaminated system comprising: (a) a cellulose ether composition comprising: (b) a first lamina comprising up to 80 weight percent of a cellulose ether selected from the group consisting of hydroxypropylmethylcellulose ethers comprising a degree of polymerization of 40 to 1600, a viscosity of 2 to 225,000 and a number average molecular weight of 9,000 to 307,200; and (c) a second lamina in parallel mated relation with the first lamina, the second lamina comprising up to 50 weight percent of a cellulose ether composition comprising a hydroxypropylcellulose comprising a hydroxypropoxyl content of 7 percent to 16 percent, and a dosage unit amount of 25 ng to 1.5 g of a beneficial drug.
Claim 11
Dependent Claim
51 words
The bilaminated system for delivering a beneficial drug to an environment of use according to claim 8, wherein the second lamina comprises a hydroxypropylmethylcellulose ether comprising a degree of polymerization of 40 to 1600, a viscosity of 2 to 225,000, and a number average molecular weight of from 9,000 to 307,200.
Claim 12
Dependent Claim
27 words
The bilaminated system for delivering a beneficial drug to an environment of use according to claim 8, wherein the first lamina comprise more than one hydroxypropylmethylcellulose ether.
Claim 13
Dependent Claim
104 words
A bilaminated system for delivering a beneficial drug to an environment of use, wherein the bilaminated system comprises: (a) at least 30 weight percent of a cellulose ether composition present in a first lamina and a second lamina; wherein the first lamina comprises up to 85 weight percent of at least one hydropropylmethylcellulose comprising a number average molecular weight of from 9,000 to 250,000; and wherein the second lamina comprises up to 85 weight percent of hydroxypropylmethylcellulose comprising a different number average molecular weight of from 9,000 to 250,000 and a dosage amount of from 25 ng to 1.5 g of a beneficial drug.
Claim 14
Dependent Claim
104 words
A bilaminated system for delivering a beneficial drug to an environment of use, wherein the bilaminated system comprises: (a) at least 30 weight percent of a cellulose ether composition present in a first lamina and a second lamina; wherein the first lamina comprises up to 85 weight percent of at least one hydropropylmethylcellulose comprising a number average molecular weight of from 9,000 to 250,000; and wherein the second lamina comprises up to 85 weight percent of hydroxypropylmethylcellulose comprising a different number average molecular weight of from 9,000 to 250,000 and a dosage amount of from 25 ng to 1.5 g of a beneficial drug.
Claim 15
Dependent Claim
26 words
The bilaminated system for delivering the beneficial drug to the environment of use according to claim 10, wherein the first lamina comprises more than one hydroxypropylmethylcellulose.
Claim 16
Dependent Claim
27 words
The bilaminated system for delivering the beneficial drug to the environment of use according to claim 10, wherein the second lamina comprises more than one hydroxypropylmethylcellulose ether.
Claim 17
Dependent Claim
103 words
A bilaminated system for delivering a beneficial drug to an environment of use, wherein the bilaminated system comprises: (a) 30 weight percent to 90 weight percent of a cellulose ether composition comprising a first lamina and a second lamina; said first lamina comprising a cellulose ether selected from a hydropropylmethylcellulose ether comprising a number average molecular weight of from 9,000 to 250,000 and a dosage unit amount of 25 ng to 1.5 g of a beneficial drug; and wherein the second lamina comprises a cellulose ether selected from a hydroxypropylmethylcellulose ether comprising a different number average molecular weight of from 9,000 to 250,000.
Claim 18
Dependent Claim
103 words
A bilaminated system for delivering a beneficial drug to an environment of use, wherein the bilaminated system comprises: (a) 30 weight percent to 90 weight percent of a cellulose ether composition comprising a first lamina and a second lamina; said first lamina comprising a cellulose ether selected from a hydropropylmethylcellulose ether comprising a number average molecular weight of from 9,000 to 250,000 and a dosage unit amount of 25 ng to 1.5 g of a beneficial drug; and wherein the second lamina comprises a cellulose ether selected from a hydroxypropylmethylcellulose ether comprising a different number average molecular weight of from 9,000 to 250,000.
Claim 19
Dependent Claim
37 words
The bilaminated system for delivering the beneficial drug to the environment of use according to claim 14, wherein the first lamina comprises more than one cellulose ether and the second lamina comprises more than one cellulose ether.
Claim 20
Dependent Claim
106 words
A bilaminated system for delivering the beneficial drug ibuprofen to an environment of use, wherein the bilaminated system comprises: a first lamina comprising up to 80 weight percent of a hydroxypropylmethylcellulose comprising a degree of polymerization of about 50 to 1260, a viscosity of about 3 to 100,000 centipoises and a number average molecular weight of 9,000 to 250,000, and a dosage amount of from 25 ng to 1.5 g of ibuprofen; and a second lamina comprising up to 50 weight percent of a hydroxypropylcellulose comprising from 7 percent to 16 percent hydroxypropoxyl, and a dosage amount of from 25 ng to 1.5 g of ibuprofen.
Claim 21
Dependent Claim
106 words
A bilaminated system for delivering the beneficial drug ibuprofen to an environment of use, wherein the bilaminated system comprises: a first lamina comprising up to 80 weight percent of a hydroxypropylmethylcellulose comprising a degree of polymerization of about 50 to 1260, a viscosity of about 3 to 100,000 centipoises and a number average molecular weight of 9,000 to 250,000, and a dosage amount of from 25 ng to 1.5 g of ibuprofen; and a second lamina comprising up to 50 weight percent of a hydroxypropylcellulose comprising from 7 percent to 16 percent hydroxypropoxyl, and a dosage amount of from 25 ng to 1.5 g of ibuprofen.
Claim 22
Dependent Claim
61 words
The bilaminated system for delivering the bewneficial drug ibuprofen to an environment of use according to claim 16, wherein the first lamina comprises up to 80 weight percent of a different hydropropylemethylcelluose comprising a degree of polymerization of about 50 to 1260, a viscosity of about 3 to 100,000 centipoises, and a number average molecular weight of from 9,000 to 250,000.
Claim 23
Dependent Claim
60 words
The bilaminated system for delivering the beneficial drug ibuprofen to an environment of use according to claim 16, wherein the second lamina comprises up to weight percent of a different hydropropylmethylcelluose comprising a degree of polymerization of about 50 to 1260, a viscosity of about 3 to 100,000 centipoises and a number average molecular weight of from 9,000 to 250,000.
Claim 24
Dependent Claim
36 words
The bilaminated system for delivering the beneficial drug ibuprofen to an environment of use according to claim 16, wherein the first lamina comprises 58 weight percent ibuprofen, and the second lamina comprises 87 weight percent ibuprofen.
Claim 25
Dependent Claim
27 words
The bilaminated system for delivering the beneficial drug ibuprofen to an environment of use according to claim 16, wherein the bilaminated system comprises 200 mg of ibuprofen.
Claim 26
Dependent Claim
27 words
The bilaminated system for delivering the beneficial drug ibuprofen to an environment of use according to claim 16, wherein the bilaminated system comprises 400 mg of ibuprofen.
Claim 27
Dependent Claim
27 words
The bilaminated system for delivering the beneficial drug ibuprofen to an environment of use according to claim 16, wherein the bilaminated system compriss 600 mg of ibuprofen.
Claim 28
Dependent Claim
36 words
The bilaminated system for delivering the beneficial drug ibuprofen to an environment of use according to claim 16, wherein the first lamina comprises 400 mg of ibuprofen and the second lamina comprises 200 mg of ibuprofen.
Claim 29
Dependent Claim
53 words
The bilaminated system for delivering the beneficial drug ibuprofen to an environment of use according to claim 16, wherein the first lamina comprises a hydropropylmethylcellulose comprising a molecular weight about 9,200 and a hydropropylmethylcellulose comprising a molecular weight about 241,900, and the second lamina comprises a hydroxypropylmethylcellulose comprising a molecular weight about 9,200.
Claim 30
Dependent Claim
105 words
A bilaminated system for delivering a beneficial drug to an environment of use wherein the bilaminated system comprises: a first lamina comprising up to 80 weight percent of a hydroxypropylmethylcellulose comprising a degree of polymerization of about 50 to 1260, a viscosity of about 3 to 100,000 centipoises and a number average molecular weight of 9,000 to 250,000; a second lamina comprising a hydroxypropylcellulose comprising a hydroxypropoxyl content of 7% to 16%; and wherein the bilaminated system comprises from 25 ng to 1.5 g of a beneficial drug selected from the group consisting of cimentidine, umetidine, ranitidine, naproxen, estrogenic, progestiational, captopril, diltiazom, and isosorbide dinitrate.
Claim 31
Dependent Claim
105 words
A bilaminated system for delivering a beneficial drug to an environment of use wherein the bilaminated system comprises: a first lamina comprising up to 80 weight percent of a hydroxypropylmethylcellulose comprising a degree of polymerization of about 50 to 1260, a viscosity of about 3 to 100,000 centipoises and a number average molecular weight of 9,000 to 250,000; a second lamina comprising a hydroxypropylcellulose comprising a hydroxypropoxyl content of 7% to 16%; and wherein the bilaminated system comprises from 25 ng to 1.5 g of a beneficial drug selected from the group consisting of cimentidine, umetidine, ranitidine, naproxen, estrogenic, progestiational, captopril, diltiazom, and isosorbide dinitrate.
Claim 32
Dependent Claim
53 words
The bilaminated system for delivering a beneficial drug to an environment of use according to claim 8, wherein the bilaminated system is sized and shaped for oral administration into the gastrointestinal tract of an animal and thr first lamina comprises more than one hydroxypropylmethylcellulose and a dosage unit amount of a beneficial drug.
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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) | 1991-11-22 | 1992-05-23 | 1992-11-22 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1995-11-22 | 1996-05-23 | 1996-11-22 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1999-11-22 | 2000-05-23 | 2000-11-22 | $7700.00 | Window Closed / Lapsed |