Patents by Inventor Tung V. Hua

Tung V. Hua has filed for patents to protect the following inventions. This listing includes patent applications that are pending as well as patents that have already been granted by the United States Patent and Trademark Office (USPTO).

  • Patent number: 5249608
    Abstract: An apparatus is used to focus a stream of pressurized air into an oil filter thereby opening any one way valve in the oil filter and forcing the waste oil out of the oil filter. The oil is then drained into a sealed oil barrel. The apparatus consists of an inlet funnel at the top, a fluid collection convergence funnel and a threaded hollow discharge spigot at the bottom of the funnel, which is designed for convenient attachment into a threaded open port of a standard oil drum. The throat of the fluid collection convergence funnel above the inlet of the discharge spigot has a chamber which is fitted with a hollow threaded holder for retaining a used oil filter cartridge. The chamber has passages for directing the pressurized air connected to a conventional general service compressed air hose fitted with an on/off trigger valve. The passages connect to the inlet passages on the retained oil filter cartridge.
    Type: Grant
    Filed: December 6, 1991
    Date of Patent: October 5, 1993
    Assignee: Lee W. Tower
    Inventor: Tung V. Hua