U.S. patents available from 1976 to present.
U.S. patent applications available from 2005 to present.

Sleeve-enclosed hydrophilic foam tampon with improved after-use withdrawal characteristics

Patent 4341214 Issued on July 27, 1982. Estimated Expiration Date: Icon_subject July 27, 1999. 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.

Patent References

1731665

2464640

3749094

3875942

3902493

Absorbent hydrophilic cellulosic product Patent #: 3971379
Issued on: 07/27/1976
Inventor: Chatterjee

Inventors

Assignee

Application

No. 05/812174 filed on 07/01/1977

US Classes:

604/365, Containing fiber or material bonding substance604/369, Foam or cellular structure material604/375, With additional chemical modifications (e.g., paper, chemical pulp, rayon, etc.)604/904, TAMPONSD24/125Catamenial (18)

Examiners

Primary: Rosenbaum, C. Fred

Attorney, Agent or Firm

International Class

A61F 13/20 (20060101)

Abstract

A catamenial tampon having as the absorbent element a resiliently compressible hydrophilic foam member, including foam-fiber composites, enclosed in an elongate, closed-end sleeve of fluid-permeable sheet material, assembled in a manner to improve withdrawal characteristics after use. The foam member is made up of an oblong rectangular strip of resiliently compressible hydrophilic polyurethane foam curled or rolled up along its length into a shape which proximates that of a hollow right cylinder in which the ends of the curled up foam strip forming the cylinder are in contact or overlap but are free of attachment to each other. The approximate cylindrical shape of the foam member is maintained by confinement inside one end of a loosely-fitting sleeve. The long axis of the sleeve coincides with the axis of the foam cylinder and the sleeve length is substantially greater than the length of the cylinder. The opposite unoccupied end of the sleeve is gathered and secured together to provide a tapered withdrawal end to which a withdrawal string is attached.

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