Patents by Inventor Allen Pu
Allen Pu 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: 7826125Abstract: A light conductive controlled shape droplet display device of the invention includes a light source. A light conductive substrate receives and conducts light from the light source. A cover disposed relative to the substrate, conducts light received from the substrate out and away from the display device. Pixels in the display are defined by fluid droplets in optical communication with the substrate and the cover. Hydrophobic layers associated with the substrate and the cover control the shape of the fluid droplet in conjunction with properties of the fluid droplet. Persistent displays are possible, as are displays that require periodic refresh to maintain the display. Electrodes modulate the amount of light conducted by the fluid droplets from the substrate into the cover. In preferred embodiments, each pixel includes sub-pixels formed by different primary colored fluid droplets.Type: GrantFiled: June 12, 2006Date of Patent: November 2, 2010Assignee: California Institute of TechnologyInventors: Demetri Psaltis, Allen Pu
-
Publication number: 20070148045Abstract: The invention provides a particle detection system. In one embodiment, the system detects live bacteria by aligning the bacteria in a test specimen with an electric field, illuminating the test specimen, and detecting the optical scattering. This invention uses no biochemical markers and can be applied in a Point-of-Care setting.Type: ApplicationFiled: October 12, 2006Publication date: June 28, 2007Applicant: California Institute of TechnologyInventors: Allen Pu, Demetri Psaltis
-
Publication number: 20070002413Abstract: A light conductive controlled shape droplet display device of the invention includes a light source. A light conductive substrate receives and conducts light from the light source. A cover disposed relative to the substrate, conducts light received from the substrate out and away from the display device. Pixels in the display are defined by fluid droplets in optical communication with the substrate and the cover. Hydrophobic layers associated with the substrate and the cover control the shape of the fluid droplet in conjunction with properties of the fluid droplet. Persistent displays are possible, as are displays that require periodic refresh to maintain the display. Electrodes modulate the amount of light conducted by the fluid droplets from the substrate into the cover. In preferred embodiments, each pixel includes sub-pixels formed by different primary colored fluid droplets.Type: ApplicationFiled: June 12, 2006Publication date: January 4, 2007Inventors: Demetri Psaltis, Allen Pu
-
Patent number: 6373967Abstract: An identification system using biometric information of human body parts and a secret sequence code. In particular, biometric information of human body parts is used to form the secret sequence code. Specifically, a combination entry device recognizes user's fingerprints which are entered as a sequence. The fingerprints must be entered in the proper sequence in order to be recognized by the system. The fingerprints are preferably recognized using a fast technique with a low-probability level of rejection. While the sensor can be fooled for any one fingerprint. The use of a plurality of different fingerprints improves the identification capability. In particular, the combination of fingerprints in the proper order is necessary to undo the lock.Type: GrantFiled: January 8, 2001Date of Patent: April 16, 2002Assignee: California Institute of TechnologyInventors: Allen Pu, Demetri Psaltis
-
Publication number: 20010007592Abstract: An identification system using biometric information of human body parts and a secret sequence code. In particular, biometric information of human body parts is used to form the secret sequence code. Specifically, a combination entry device recognizes user's fingerprints which are entered as a sequence. The fingerprints must be entered in the proper sequence in order to be recognized by the system. The fingerprints are preferably recognized using a fast technique with a low-probability level of rejection. While the sensor can be fooled for any one fingerprint. The use of a plurality of different fingerprints improves the identification capability. In particular, the combination of fingerprints in the proper order is necessary to undo the lock.Type: ApplicationFiled: January 8, 2001Publication date: July 12, 2001Applicant: California Institute of Technology,Inventors: Allen Pu, Demetri Psaltis
-
Patent number: 6229906Abstract: An identification system using biometric information of human body parts and a secret sequence code. In particular, biometric information of human body parts is used to form the secret sequence code. Specifically, a combination entry device recognizes user's fingerprints which are entered as a sequence. The fingerprints must be entered in the proper sequence in order to be recognized by the system. The fingerprints are preferably recognized using a fast technique with a low-probability level of rejection. While the sensor can be fooled for any one fingerprint. The use of a plurality of different fingerprints improves the identification capability. In particular, the combination of fingerprints in the proper order is necessary to undo the lock.Type: GrantFiled: June 1, 1999Date of Patent: May 8, 2001Assignee: California Institute of TechnologyInventors: Allen Pu, Demetri Psaltis
-
Patent number: 5982513Abstract: A method and a system to re-align onto a detector array a holographic image of a Fourier region hologram stored in a medium, with the medium spinning around a first axis, and the hologram being generated by a reference beam and a signal beam. In generating the hologram, the reference beam is incident on the medium with respect to a second axis at a second-axis-incident angle, and a third axis at a third-axis-incident angle, such that the holographic image of the hologram when reproduced by the reference beam is aligned onto the detector array. Also, the three axes are substantially orthogonal to each other. As the medium spins, the medium's orientation can change through tilting with respect to the second and the third axes so that the holographic image when reproduced by the reference beam is not aligned onto the detector array.Type: GrantFiled: February 9, 1998Date of Patent: November 9, 1999Assignee: Holoplex, Inc.Inventors: Gan Zhou, Demetri Psaltis, Fai Mok, Allen Pu
-
Patent number: 5949558Abstract: The invention is embodied in a method of recording successive holograms in a recording medium, using at least a fan of M waves along at least a first axis with a separation angle between adjacent waves and directing the fan of M waves as a reference beam along a reference beam path onto the recording medium, successively modulating a wave with a succession of images to produce a succession of signal beams along a signal beam path lying at a propagation angle relative to the reference beam path so that the signal and reference beams intersect at abeam intersection lying within the medium, the beam intersection having a size corresponding to beam areas of the reference and signal beams, producing a succession of relative displacements in a direction parallel to the first axis between the recording medium and the beam intersection of the signal and reference beam paths in synchronism with the succession of signal beams, each of the displacements being less than the size of the intersection whereby to record succType: GrantFiled: July 8, 1997Date of Patent: September 7, 1999Assignee: California Institute of TechnologyInventors: Demetri Psaltis, Michael J. Levene, Allen Pu, George Barbastathis
-
Patent number: 5933515Abstract: An identification system using biometric information of human body parts and a secret sequence code. In particular, biometric information of human body parts is used to form the secret sequence code. Specifically, a combination entry device recognizes user's fingerprints which are entered as a sequence. The fingerprints must be entered in the proper sequence in order to be recognized by the system. The fingerprints are preferably recognized using a fast technique with a low-probability level of rejection. While the sensor can be fooled for any one fingerprint. The use of a plurality of different fingerprints improves the identification capability. In particular, the combination of fingerprints in the proper order is necessary to undo the lock.Type: GrantFiled: July 25, 1996Date of Patent: August 3, 1999Assignee: California Institute of TechnologyInventors: Allen Pu, Demetri Psaltis
-
Patent number: 5671073Abstract: The invention is embodied in a method of recording successive holograms in a recording medium, using at least a fan of M waves along at least a first axis with a separation angle between adjacent waves and directing the fan of M waves as a reference beam along a reference beam path onto the recording medium, successively modulating a wave with a succession of images to produce a succession of signal beams along a signal beam path lying at a propagation angle relative to the reference beam path so that the signal and reference beams intersect at a beam intersection lying within the medium, the beam intersection having a size corresponding to beam areas of the reference and signal beams, producing a succession of relative displacements in a direction parallel to the first axis between the recording medium and the beam intersection of the signal and reference beam paths in synchronism with the succession of signal beams, each of the displacements being less than the size of the intersection whereby to record sucType: GrantFiled: February 15, 1995Date of Patent: September 23, 1997Assignee: California Institute of TechnologyInventors: Demetri Psaltis, Michael J. Levene, Allen Pu, George Barbastathis
-
Patent number: 5483365Abstract: A peristrophic multiplexing system directs a signal light beam and reference light beam onto a selected recording spot in the recording medium. The light beams collectively define a plane of interaction. Either the recording medium or the signal/reference beam are rotated relative to the other through a succession of peristrophic multiplexing angles. Those angles cause relative rotation about an axis that is not perpendicular to the plane of selectivity. The rotation occurs contemporaneously with the modulating of the hologram on the medium.Type: GrantFiled: May 10, 1994Date of Patent: January 9, 1996Assignee: California Institute of TechnologyInventors: Allen Pu, Kevin Curtis, Demetri Psaltis
-
Patent number: D409251Type: GrantFiled: February 12, 1998Date of Patent: May 4, 1999Assignee: Holoplex, Inc.Inventors: Fai Mok, Yong Qiao, Allen Pu, Matt Lazich, Rudy Gastelum, Sean Lee