US3402240A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Medicinal tablet and process of making same
Assignee: Pfizer Inc
•
Filing: 1957-06-25
•
Granted: 1968-09-17
•
Expires: 1977-06-25
Abstract
No abstract record available.
Inventors
- 👤 Russell A Cain
- 👤 Nicholas J Federici
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 12:03
CPC Classifications
A; A61; A61K; A61K9/00; A61K9/20; A61K9/2004; A61K9/2013; A61K9/2009
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
143 words
A MEDICINAL TABLET FOR ORAL ADMINISTRATION COMPRISING A CONTINUUM OF NON-TOXIC MATRIX IN SKELETON FORM, SAID MATRIX CONSISTING ESSENTIALLY OF WAX WHICH HAS A MELTING POINT BETWEEN ABOUT 65* AND ABOUT 90*C. AND IS INSOLUBLE IN DIGESTIVE JUICE, AND SAID MATRIX HAVING IN THE INTERSTICES THEREOF INTERCONNECTED CANALS AND DUCTS, THE CANALS AND DUCTS BEING FILLED WITH A DRUG AND LEACHABLE FILLER, THE CANALS AND DUCTS BEING CONTINUOUS TO THE OUTER SURFACES OF THE TABLET SO THAT A PORTION OF SAID DRUG AND FILLER EXTENDS TO AND IS EXPOSED ON AN OUTER SURFACE OF SAID TABLET, THE MATRIX RESISTING DISTINEGRATION IN DIGESTIVE JUICES AND RETAINING SUBSTANTIALLY ITS ORGINAL TABLET FORM DURING THE ENTIRE LEACHING OUT PERIOD,M SAID TABLET REQUIRING A PERIOD OF AT LEAST ABOUT 8 HOURS FOR THE DRUG TO BE SUBSTANTIALLY COMPLETELY LEACHED THEREFROM BY THE ACTION OF SAID DIGESTIVE JUICE.
Claim 2
Dependent Claim
143 words
A MEDICINAL TABLET FOR ORAL ADMINISTRATION COMPRISING A CONTINUUM OF NON-TOXIC MATRIX IN SKELETON FORM, SAID MATRIX CONSISTING ESSENTIALLY OF WAX WHICH HAS A MELTING POINT BETWEEN ABOUT 65* AND ABOUT 90*C. AND IS INSOLUBLE IN DIGESTIVE JUICE, AND SAID MATRIX HAVING IN THE INTERSTICES THEREOF INTERCONNECTED CANALS AND DUCTS, THE CANALS AND DUCTS BEING FILLED WITH A DRUG AND LEACHABLE FILLER, THE CANALS AND DUCTS BEING CONTINUOUS TO THE OUTER SURFACES OF THE TABLET SO THAT A PORTION OF SAID DRUG AND FILLER EXTENDS TO AND IS EXPOSED ON AN OUTER SURFACE OF SAID TABLET, THE MATRIX RESISTING DISTINEGRATION IN DIGESTIVE JUICES AND RETAINING SUBSTANTIALLY ITS ORGINAL TABLET FORM DURING THE ENTIRE LEACHING OUT PERIOD,M SAID TABLET REQUIRING A PERIOD OF AT LEAST ABOUT 8 HOURS FOR THE DRUG TO BE SUBSTANTIALLY COMPLETELY LEACHED THEREFROM BY THE ACTION OF SAID DIGESTIVE JUICE.
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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) | 1971-09-17 | 1972-03-18 | 1972-09-17 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1975-09-17 | 1976-03-18 | 1976-09-17 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1979-09-17 | 1980-03-18 | 1980-09-17 | $7700.00 | Window Closed / Lapsed |