Patents by Inventor Qizhou Dai

Qizhou Dai 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).

  • Low stress flowable dental composition
    Patent number: 9155685
    Abstract: Disclosed herein are low viscosity and low stress dental compositions comprising at least one low stress polymerizable resin and at least one filler. The dental compositions described herein have high depth of cure and self-leveling characteristics and are capable of bulk application.
    Type: Grant
    Filed: May 2, 2011
    Date of Patent: October 13, 2015
    Assignee: DENTSPLY INTERNATIONAL INC.
    Inventors: Xiaoming Jin, Louis Bertrand, Qizhou Dai, Michael T. O'Connor, Paul D. Hammesfahr, Bernard Koltisko
  • Method and apparatus for visualizing contraction stress from curable materials
    Patent number: 8443681
    Abstract: Disclosed herein is an apparatus and a method to use such an apparatus for visualizing the contraction stress from curable materials. Particularly, a simple test device has been designed and fabricated and a method of using such a device, which allows a user to easily distinguish the curable materials that can generate contraction stress in different magnitudes. More specifically, the present disclosure provides a simple and effective way to make the complicated contraction stress due to polymerization (curing or setting) visualizable and audible.
    Type: Grant
    Filed: November 7, 2011
    Date of Patent: May 21, 2013
    Assignee: DENTSPLY International Inc.
    Inventors: Xiaoming Jin, Louis Bertrand, Qizhou Dai, Bill Martin, Nils Classen, Nikki Sparacino
  • METHOD AND APPARATUS FOR VISUALIZING CONTRACTION STRESS FROM CURABLE MATERIALS
    Publication number: 20120285258
    Abstract: Disclosed herein is an apparatus and a method to use such an apparatus for visualizing the contraction stress from curable materials. Particularly, a simple test device has been designed and fabricated and a method of using such a device, which allows a user to easily distinguish the curable materials that can generate contraction stress in different magnitudes. More specifically, the present disclosure provides a simple and effective way to make the complicated contraction stress due to polymerization (curing or setting) visualizable and audible.
    Type: Application
    Filed: November 7, 2011
    Publication date: November 15, 2012
    Applicant: DENTSPLY International Inc.
    Inventors: Xiaoming Jin, Louis Bertrand, Qizhou Dai, Bill Martin, Nils Classen, Nikki Sparacino
  • LOW STRESS FLOWABLE DENTAL COMPOSITION
    Publication number: 20110315928
    Abstract: Disclosed herein are low viscosity and low stress dental compositions comprising at least one low stress polymerizable resin and at least one filler. The dental compositions described herein have high depth of cure and self-leveling characteristics and are capable of bulk application.
    Type: Application
    Filed: May 2, 2011
    Publication date: December 29, 2011
    Applicant: DENTSPLY International Inc.
    Inventors: XIAOMING JIN, Louis Bertrand, Qizhou Dai, Michael T. O'Connor, Paul D. Hammesfahr, Bernard Koltisko