US3696188A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Laminated tablets
Assignee: Merck Sharp & Dohme LLC
•
Filing: 1971-06-16
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Granted: 1972-10-03
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Expires: 1991-06-16
Abstract
Abstract Laminated, pan-coated tablets are described wherein the various medicament layers are separated by a layer containing 10-50 percent of a silica gel having a specified pore size. This silica gel layer not only substantially reduces the processing time but also aids in preventing migration of the ingredients and in accelerating dissolution.
Inventors
- 👤 Raul O Fernandez
- 👤 Vincent F Cannito
- 👤 Oscar Olsen
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 09:36
CPC Classifications
A; A61; A61J; A61J3/00; A61J3/005
Claims Analysis
Total Claims: 5
Claim 1
Independent Claim
16 words
A tablet according to claim 1 wherein said core contains at least one pharmacologically active ingredient.
Claim 2
Dependent Claim
22 words
A tablet according to claim 1 wherein said core contains a material incompatible with at least one material in the surrounding layers.
Claim 3
Dependent Claim
23 words
A tablet according to claim 1 wherein a layer of said silica gel surrounds said core before the first of said medicament-containing layers.
Claim 4
Dependent Claim
23 words
A tablet according to claim 1 wherein said silica gel has an average pore diameter of from about 125 to 300 angstrom units.
Claim 5
Dependent Claim
16 words
A tablet according to claim 1 where at least one of said medicament-containing layers comprises phenylephrine.
References Cited (Backward Citations)
US3247064A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1975-10-03 | 1976-04-03 | 1976-10-03 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1979-10-03 | 1980-04-03 | 1980-10-03 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1983-10-03 | 1984-04-03 | 1984-10-03 | $7700.00 | Window Closed / Lapsed |