Patent US4595587A successfully refreshed from Google Patents.
US4595587A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Divisible pharmaceutical tablet with delayed active ingredient release
Assignee: Boehringer Ingelheim GmbH
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Filing: 1985-07-03
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Granted: 1986-06-17
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Expires: 2005-07-03
Abstract
Abstract A novel divisible delayed release pharmaceutical tablet, wherein the rate of release of active ingredient is independent of the size and nature of the total surface area, and the fragments of which have the same characteristics of release of active ingredient as the undivided tablet.
Inventors
- 👤 Bernd Zierenberg
- 👤 Arun R. Gupte
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-04 16:44
CPC Classifications
A; A61; A61K; A61K9/00; A61K9/20; A61K9/2004; A61K9/2022; A61K9/2027; A61K9/2072; A61K9/2077; A61K9/14; A61K9/141; A61K9/146
Claims Analysis
Total Claims: 5
Claim 1
Independent Claim
63 words
A pharmaceutical tablet-making composition consisting essentially of finely divided emulsion-polymerized polyacrylate material having a particle size between 10 and 500 microns, ground below the glass temperature, without the excipients, conventional tablet-making excipients and active ingredient having a molecular weight up to about 500, and a diffusion co-efficient of about 10 -5 to 10 -7 cm 2 /hr. molecularly dispersed in said polyacrylate material.
Claim 2
Dependent Claim
63 words
A pharmaceutical tablet-making composition consisting essentially of finely divided emulsion-polymerized polyacrylate material having a particle size between 10 and 500 microns, ground below the glass temperature, without the excipients, conventional tablet-making excipients and active ingredient having a molecular weight up to about 500, and a diffusion co-efficient of about 10 -5 to 10 -7 cm 2 /hr. molecularly dispersed in said polyacrylate material.
Claim 3
Dependent Claim
30 words
A composition of claim 1, where said polyacrylate material is a copolymer of methyl and/or ethyl esters of acrylic and methacrylic acid having an average molecular weight of about 800,000.
Claim 4
Dependent Claim
19 words
A composition of claim 2, where ethylene polymers with acidic or basic groups are admixed with the polyacrylate material.
Claim 5
Dependent Claim
46 words
A composition of claim 1, where said active ingredient is an organic compound having a molecular weight of up to about 500 and a diffusion coefficient of about 10 -5 to 10 -7 cm 2 /hr and is present in an amount up to 50 mg.
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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) | 1989-06-16 | 1989-12-16 | 1990-06-17 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1993-06-16 | 1993-12-16 | 1994-06-17 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1997-06-16 | 1997-12-16 | 1998-06-17 | $7700.00 | Window Closed / Lapsed |