Patents Assigned to Ngee Ann Polytechnic
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Patent number: 11148099Abstract: A graphene-based membrane and a method of producing the same are disclosed. The graphene-based membrane may include a graphene-polymer composite, wherein the graphene-polymer composite may consist of an amine functionalized graphene and a polymer containing an anhydride group as a linker for linking the amine functionalized graphene to the polymer. The graphene-based membrane may be constructed of a single-layer. A method may include reacting a polymer containing an anhydride with an amine functionalized graphene in presence of a solvent to form an intermediate product; and thermal imidizing the intermediate product to form a graphene grafted polymer composite for use in fabricating a graphene-based membrane.Type: GrantFiled: January 15, 2020Date of Patent: October 19, 2021Assignee: Ngee Ann PolytechnicInventors: James Antony Prince, Sowrirajalu Bhuvana, Anbharasi Vanangamudi, Gurdev Singh
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Publication number: 20200164318Abstract: A graphene-based membrane and a method of producing the same are disclosed. The graphene-based membrane may include a graphene-polymer composite, wherein the graphene-polymer composite may consist of an amine functionalized graphene and a polymer containing an anhydride group as a linker for linking the amine functionalized graphene to the polymer. The graphene-based membrane may be constructed of a single-layer. A method may include reacting a polymer containing an anhydride with an amine functionalized graphene in presence of a solvent to form an intermediate product; and thermal imidizing the intermediate product to form a graphene grafted polymer composite for use in fabricating a graphene-based membrane.Type: ApplicationFiled: January 15, 2020Publication date: May 28, 2020Applicant: Ngee Ann PolytechnicInventors: James Antony PRINCE, Sowrirajalu BHUVANA, Anbharasi VANANGAMUDI, Gurdev SINGH
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Patent number: 10336641Abstract: A method for producing foam glass with high open pore content using recycled waste glass. The size of the pores of the foam glass is small and uniform, and such foam glass is suitable for building material with thermal insulating and sound proofing properties. The foam glass produced by this method is lightweight, durable and has high compression strength.Type: GrantFiled: April 11, 2012Date of Patent: July 2, 2019Assignee: Ngee Ann PolytechnicInventors: Xiaolong Sun, Qingchi Xu
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Patent number: 10118128Abstract: This invention relates to a vacuum air gap membrane distillation system for desalination purposes. More particularly, this invention relates to a membrane distillation system with multiple cells in which the system's flux is increased due to the temperature and pressure differential within the system. The configuration of the vacuum air gap membrane distillation system allows for latent heat within the system to be recycled effectively reducing the energy consumption of the system.Type: GrantFiled: April 2, 2012Date of Patent: November 6, 2018Assignee: Ngee Ann PolytechnicInventors: James Antony Prince, Gurdev Singh, Tiruvannamalai Subbarayan Shanmugasundaram
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Publication number: 20180036675Abstract: This invention relates to a system for continuously dehumidifying humid gas. More particularly, this invention relates to a system that continuously dehumidifies gas using a liquid desiccant dehumidifying module, a regeneration modules utilizing a membrane distillation module to regenerate diluted liquid desiccant and means for connecting the two modules together.Type: ApplicationFiled: December 18, 2015Publication date: February 8, 2018Applicant: Ngee Ann PolytechnicInventors: James Selvaraj Antony Prince, Gurdev Singh, Kwok Ho Lam, Ayyanar Neelamegam, Belinda Owen
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Patent number: 9751052Abstract: This invention relates to a triple layer composite nanofiber membrane for Membrane Distillation (MD) applications. The triple layer membrane has an extremely hydrophobic nanofiber layer, a hydrophobic microporous middle layer and a hydrophilic backing layer for MD applications.Type: GrantFiled: November 17, 2011Date of Patent: September 5, 2017Assignee: Ngee Ann PolytechnicInventors: Gurdev Singh, James Antony Prince
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Patent number: 9421293Abstract: A multi-layered filtration medium for detoxification of chemical contaminants and disinfection of biological contaminants. The filtration medium includes two disinfection nanofiber layers and one detoxification nanofiber layer disposed between the two disinfection nanofiber layers. The filtration medium is loaded with high content of a detoxifying material which capable of achieving about 95% detoxification efficiency with no leaching of the detoxifying material. The filtration medium may also include a medicinal substance for medical applications and a sensor for indicating the lifetime of the filtration medium.Type: GrantFiled: April 17, 2012Date of Patent: August 23, 2016Assignee: Ngee Ann PolytechnicInventors: Gurdev Singh, Anbharasi Vanangamudi, James Antony Prince
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Publication number: 20140326658Abstract: This invention relates to a triple layer composite nanofiber membrane for Membrane Distillation (MD) applications. The triple layer membrane has an extremely hydrophobic nanofiber layer, a hydrophobic microporous middle layer and a hydrophilic backing layer for MD applications.Type: ApplicationFiled: November 17, 2011Publication date: November 6, 2014Applicant: Ngee Ann PolytechnicInventors: Gurdev Singh, James Antony Prince
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Patent number: 8363316Abstract: An optical configuration for a digital holographic microscope and a method for digital holographic microscopy are presented. In one embodiment, digital off-axis holograms are obtained using a cube beam splitter (110) to both split and combine a diverging spherical wavefront emerging from a microscope objective (108). When a plane numerical reference wavefront is used for the reconstruction of the recorded digital hologram, the phase curvature introduced by the microscope objective (108) together with the illuminating wave to the object wave can be physically compensated.Type: GrantFiled: August 21, 2009Date of Patent: January 29, 2013Assignees: Nanyang Technological University, Ngee Ann PolytechnicInventors: Anand Krishna Asundi, Weijuan Qu, Oi Choo Chee
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Publication number: 20120090613Abstract: A breathing apparatus comprising: an inlet configured to receive pressurised gases, an outlet configured to diffuse the pressurised gases within the dead space of a face mask, a detachable nozzle manifold configured to pass the pressurised gases from the inlet to the outlet, and a seal configured to substantially air tight seal the nozzle manifold between a user's face and a bottom inner surface of the mask.Type: ApplicationFiled: October 14, 2010Publication date: April 19, 2012Applicant: Ngee Ann PolytechnicInventors: Kok Meng Woon, Ah Kat Tan, Kaya Totong, Teck Soon Ong, Geoffrey Chor Yong Tan
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Publication number: 20110043878Abstract: An optical configuration for a digital holographic microscope and a method for digital holographic microscopy are presented. In one embodiment, digital off-axis holograms are obtained using a cube beam splitter (110) to both split and combine a diverging spherical wavefront emerging from a microscope objective (108). When a plane numerical reference wavefront is used for the reconstruction of the recorded digital hologram, the phase curvature introduced by the microscope objective (108) together with the illuminating wave to the object wave can be physically compensated.Type: ApplicationFiled: August 21, 2009Publication date: February 24, 2011Applicants: Nanyang Technological University, Ngee Ann PolytechnicInventors: Anand Krishna Asundi, Weijuan Qu, Oi Choo
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Patent number: 7103242Abstract: A photonic switch for switching an incoming light beam from a first path to a second path, the photonic switch comprising a light sensitive material with a refractive index able to be changed by an induced light.Type: GrantFiled: March 1, 2005Date of Patent: September 5, 2006Assignee: Ngee Ann PolytechnicInventor: Hegde M. Gopalkrishna
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Patent number: 6396343Abstract: The instrumentation amplifier circuit of the present invention is particularly suited for amplifying ECG signals, rejecting common mode signals and removing a DC offset. The preferred embodiment of the present invention basically comprises a front-stage differential amplifier, and a common-mode rejection circuit. By employing a twin-T network, the front stage differential amplifier is able to simultaneously remove the DC offset and achieve high gain using standard off-the-shelf components. The common mode differential gain, however, is zero, which is the desired result. The common-mode rejection circuit removes the common-mode signal to yield only the amplified ECG signal. The present amplifier circuit has a much greater DC offset tolerance than the prior art amplifier while the Common Mode Rejection Ratio (CMRR), residual noise at the output, and the input dynamic range is comparable to that of the prior art amplifier. Moreover, it requires fewer operational amplifiers.Type: GrantFiled: January 26, 2001Date of Patent: May 28, 2002Assignee: Ngee Ann PolytechnicInventor: Johnny Chee