Abuse resistant tablets

Patent 6309668 Issued on October 30, 2001. Estimated Expiration Date:

July 30, 2016. Estimated Expiration Date is calculated based on simple USPTO term provisions. It does not account for terminal disclaimers, term adjustments, failure to pay maintenance fees, or other factors which might affect the term of a patent.

Abstract Claims Description Full Text

Patent References

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Inventors

Application

No. 676113 filed on 07/30/1996

US Classes:

424/472, Layered unitary dosage forms424/474, Coated pills or tablets424/479, Containing polysaccharide (e.g., sugar, etc.)424/480, Cellulose or derivative424/481Containing natural gums or resins

Examiners

Primary: Page, Thurman K.
Assistant: Joynes, R.

Attorney, Agent or Firm

Oehler; Ross J., Wang; George G.

Foreign Patent References

664908 DE. 08/13/2012
0 546 593 EP. 06/13/1993
2203338 GB. 10/13/1988
63-44125 JP. 09/13/1988
WO 94/06416 WO. 03/13/1994

International Class

A61K 009/34

Foreign Application Priority Data

1994-02-01 GB

Abstract

This invention relates to an abuse resistant tablet containing two or more layers having one or more drugs and one or more gelling agents and its preparation. The drug(s) and gelling agent(s) are in separate layers of the tablet. The multilayer tablet is particularly suitable for the administration of drugs prone to abuse by unauthorized parenteral administration such as analgesics, hypnotics, and anxiolytics.