Patents by Inventor Mei Yin Chang

Mei Yin Chang 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).

  • Microdermabrasion canister rack system
    Patent number: 7232444
    Abstract: A canister rack system for a microdermabrasion machine has a base with bores. The base has conduits for crystal passage through the canister rack. The canisters are mountable upon the canister rack and include supply and storage canisters. The supply canister has a feeding conduit for the exit of crystal from the supply canister and the storage canister has a return conduit and a filtered conduit. The canister rack bores are formed at the base so that the conduits from the storage canister and supply canister meet with their respective conduits to form an airtight seal. A Horizontal locking pin protrudes from each canister and locks into a pair of horizontal slots formed in the canister rack. A vertical locking pin protrudes from the base of the canister rack and locks into a slot formed in each canister. A latch attaches each canister to the canister rack.
    Type: Grant
    Filed: June 24, 2003
    Date of Patent: June 19, 2007
    Inventor: Mei Yin Chang
  • Microdermabrasion canister rack system
    Publication number: 20040267285
    Abstract: A canister rack system for a microdermabrasion machine has a base with bores. The base has conduits for crystal passage through the canister rack. The canisters are mountable upon the canister rack and include supply and storage canisters. The supply canister has a feeding conduit for the exit of crystal from the supply canister and the storage canister has a return conduit and a filtered conduit. The canister rack bores are formed at the base so that the conduits from the storage canister and supply canister meet with their respective conduits to form an airtight seal. A Horizontal locking pin protrudes from each canister and locks into a pair of horizontal slots formed in the canister rack. A vertical locking pin protrudes from the base of the canister rack and locks into a slot formed in each canister. A latch attaches each canister to the canister rack.
    Type: Application
    Filed: June 24, 2003
    Publication date: December 30, 2004
    Inventor: Mei Yin Chang
  • Device for communicating a doorside intercom set with a remote telephone
    Patent number: 4943997
    Abstract: A device is disclosed for communicating a doorside intercom set of an intercom system with a selected forwarding telephone, having a microprocessor and an input for inputting the telephone number of the selected remote telephone. To detect the state of the selected remote telephone, a back-ring/busy tone detector is provided. To enable a host to remotely change the number of the selected remote telephone, a multiple frequency signal decoder and a ring detector is provided.
    Type: Grant
    Filed: April 14, 1989
    Date of Patent: July 24, 1990
    Inventor: Mei-Yin Chang