U.S. patents available from 1976 to present. U.S. patent
applications available from 2005 to present.  Ear plugs and
method of forming same  Patent 7096872 Issued on August 29,
2006. Estimated Expiration Date: Icon_subject September 27,
2022. 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
Apparatus for making high speed corrugated plastic tubing Patent
#: 3981663 Issued on: 09/21/1976 Inventor: Lupke  Disposable ear
plug Patent #: 4434794 Issued on: 03/06/1984 Inventor: Leight
Chainless mold drive for a corrugator or the like Patent #:
4504206 Issued on: 03/12/1985 Inventor: Lupke ,   et al.  Washer
cutting procedure Patent #: 4617849 Issued on: 10/21/1986
Inventor: Ligon  Washer cutting apparatus Patent #: 4708624
Issued on: 11/24/1987 Inventor: Ligon  Slow recove