[Federal Register Volume 59, Number 167 (Tuesday, August 30, 1994)]
[Unknown Section]
[Page 0]
From the Federal Register Online via the Government Publishing Office [www.gpo.gov]
[FR Doc No: 94-21286]


[[Page Unknown]]

[Federal Register: August 30, 1994]


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DEPARTMENT OF HEALTH AND HUMAN SERVICES
[Docket No. 94E-0071]

 

Determination of Regulatory Review Period for Purposes of Patent 
Extension; Zosyn

AGENCY: Food and Drug Administration, HHS.

ACTION: Notice.

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SUMMARY: The Food and Drug Administration (FDA) has determined the 
regulatory review period for Zosyn and is publishing this 
notice of that determination as required by law. FDA has made the 
determination because of the submission of an application to the 
Commissioner of Patents and Trademarks, Department of Commerce, for the 
extension of a patent which claims that human drug product.

ADDRESSES: Written comments and petitions should be directed to the 
Dockets Management Branch (HFA-305), Food and Drug Administration, rm. 
1-23, 12420 Parklawn Dr., Rockville, MD 20857.

FOR FURTHER INFORMATION CONTACT: Brian J. Malkin, Office of Health 
Affairs (HFY-20), Food and Drug Administration, 5600 Fishers Lane, 
Rockville, MD 20857, 301-443-1382.

SUPPLEMENTARY INFORMATION: The Drug Price Competition and Patent Term 
Restoration Act of 1984 (Pub. L. 98-417) and the Generic Animal Drug 
and Patent Term Restoration Act (Pub. L. 100-670) generally provide 
that a patent may be extended for a period of up to 5 years so long as 
the patented item (human drug product, animal drug product, medical 
device, food additive, or color additive) was subject to regulatory 
review by FDA before the item was marketed. Under these acts, a 
product's regulatory review period forms the basis for determining the 
amount of extension an applicant may receive.
    A regulatory review period consists of two periods of time: a 
testing phase and an approval phase. For human drug products, the 
testing phase begins when the exemption to permit the clinical 
investigations of the drug becomes effective and runs until the 
approval phase begins. The approval phase starts with the initial 
submission of an application to market the human drug product and 
continues until FDA grants permission to market the drug product. 
Although only a portion of a regulatory review period may count toward 
the actual amount of extension that the Commissioner of Patents and 
Trademarks may award (for example, half the testing phase must be 
subtracted as well as any time that may have occurred before the patent 
was issued), FDA's determination of the length of a regulatory review 
period for a human drug product will include all of the testing phase 
and approval phase as specified in 35 U.S.C. 156(g)(1)(B).
    FDA recently approved for marketing the human drug product 
Zosyn (tazobactam sodium and piperacillin sodium). 
Zosyn is indicated as for the treatment of patients with 
moderate to severe infections caused by piperacillin resistant, 
piperacillin/tazobactam susceptible, -lactamase producing 
strains of the designated microorganisms in certain specified 
conditions. Subsequent to this approval, the Patent and Trademark 
Office received a patent term restoration application for 
Zosyn (U.S. Patent No. 4,562,073) from Taiho Pharmaceutical 
Co., Ltd., and the Patent and Trademark Office requested FDA's 
assistance in determining this patent's eligibility for patent term 
restoration. In a letter dated April 19, 1994, FDA advised the Patent 
and Trademark Office that this human drug product had undergone a 
regulatory review period and that the approval of Zosyn 
represented the first permitted commercial marketing or use of the 
product. Shortly thereafter, the Patent and Trademark Office requested 
that FDA determine the product's regulatory review period.
    FDA has determined that the applicable regulatory review period for 
Zosyn is 1,819 days. Of this time, 1,038 days occurred during 
the testing phase of the regulatory review period, while 781 days 
occurred during the approval phase. These periods of time were derived 
from the following dates:
    1. The date an exemption under section 505(i) of the Federal Food, 
Drug, and Cosmetic Act became effective: October 31, 1988. The 
applicant claims July 10, 1988, as the date the investigational new 
drug application (IND) for Zosyn (IND 31,705) became 
effective. However, IND 31,705 was received on June 14, 1988, and it 
was placed on clinical hold on July 1, 1988. It was removed from 
clinical hold on October 31, 1988, making the IND effective date 
October 31, 1988.
    2. The date the application was initially submitted with respect to 
the human drug product under section 507 of the Federal Food, Drug, and 
Cosmetic Act: September 3, 1991. The applicant claims August 30, 1991, 
as the date the new drug application (NDA) for Zosyn (NDA 50-
684) was initially submitted. However, FDA records indicate that NDA 
50-684 was submitted on September 3, 1991.
    3. The date the application was approved: October 22, 1993. FDA has 
verified the applicant's claim that NDA 50-684 was approved on October 
22, 1993.
    This determination of the regulatory review period establishes the 
maximum potential length of a patent extension. However, the U.S. 
Patent and Trademark Office applies several statutory limitations in 
its calculations of the actual period for patent extension. In its 
application for patent extension, this applicant seeks 1,358 days of 
patent term extension.
    Anyone with knowledge that any of the dates as published is 
incorrect may, on or before October 31, 1994, submit to the Dockets 
Management Branch (address above) written comments and ask for a 
redetermination. Furthermore, any interested person may petition FDA, 
on or before February 27, 1995, for a determination regarding whether 
the applicant for extension acted with due diligence during the 
regulatory review period. To meet its burden, the petition must contain 
sufficient facts to merit an FDA investigation. (See H. Rept. 857, part 
1, 98th Cong., 2d sess., pp. 41-42, 1984.) Petitions should be in the 
format specified in 21 CFR 10.30.
    Comments and petitions should be submitted to the Dockets 
Management Branch (address above) in three copies (except that 
individuals may submit single copies) and identified with the docket 
number found in brackets in the heading of this document. Comments and 
petitions may be seen in the Dockets Management Branch between 9 a.m. 
and 4 p.m., Monday through Friday.

    Dated: August 16, 1994.
Stuart L. Nightingale,
Associate Commissioner for Health Affairs.
[FR Doc. 94-21286 Filed 8-29-94; 8:45 am]
BILLING CODE 4160-01-F