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US3402240A Expired / Lapsed US ⏱️ 0.0 years remaining

Medicinal tablet and process of making same

Assignee: Pfizer Inc
•
Filing: 1957-06-25
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Granted: 1968-09-17
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Expires: 1977-06-25
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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 14:42
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.

References Cited (Backward Citations)

USRE24090E Cited
US2413419A Cited
US2793979A Cited
US2841528A Cited
US2736682A Cited
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US2951792A Cited

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

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