Patents by Inventor Arunava Dutta
Arunava Dutta 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).
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Patent number: 7303307Abstract: An electrodeless lamp (10a), wherein the lamp comprises a closed-loop, tubular lamp envelope (13) with parallel cylindrical glass tubes (14a 16a) containing an arc generating and sustaining medium, means (20a) in the form of magnetic toroids for energizing the medium; and a reflector coating (22) associated with the envelope (13) and affixed thereto. In a preferred embodiment of the invention the reflector coating (22) is on the internal surface (24) of the envelope and comprises a layer of a reflective m, such as alumina. Alternatively, the reflective coating (22) can be applied to the external surface of the envelope.Type: GrantFiled: November 24, 2004Date of Patent: December 4, 2007Assignee: Osram Sylvania Inc.Inventors: Robert Martin, Aline Tétreault, Arunava Dutta, Daniel Marian
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Patent number: 7260767Abstract: Methods for correcting errors in a GFP-T superblock include buffering the 64 bytes of data in an 8×8 byte buffer, buffering the flag byte in a separate buffer, calculating the CRC remainder, and performing single and double bit error correction in three stages. In the first stage, the CRC remainder is compared to a single bit error syndrome table and if an error is located, it is corrected. In the second stage, the CRC remainder is compared to a double bit error syndrome table and if an error is located, it is corrected. The third stage corrects the second error of a double bit error. The flag byte is processed first, followed by the data bytes, eight bytes at a time.Type: GrantFiled: August 23, 2004Date of Patent: August 21, 2007Assignee: Transwitch CorporationInventors: Santanu Bhattacharya, Neeraj Gupta, Yogesh Mittal, Priya Darshini, Arunava Dutta, Suvhasis Mukhopadhyay
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Publication number: 20070069624Abstract: There are provided UV-emitting phosphors, a phosphor blend and a lamp containing same. The blend is comprised of a mixture of a YPO4:Ce phosphor and a LaPO4:Ce phosphor. The YPO4:Ce and LaPO4:Ce phosphors may be surface treated to increase their isoelectric point to enhance lamp stabilization. A third phosphor having an isoelectric point that is at least 3 pH units higher than either of the YPO4:Ce and LaPO4:Ce phosphors also may be added to improve lamp stabilization time. The phosphor blend is lead-free and lamps containing the blend provide equivalent performance to state-of-the-art tanning lamps.Type: ApplicationFiled: September 25, 2006Publication date: March 29, 2007Inventors: Arunava Dutta, Leonard Dullea, Chen Fan, Aline Tetreault, Nicolas Desbiens
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Publication number: 20070047579Abstract: A multipacket interface is easily adaptable to any of several link layer interfaces via a simple adaptation layer which can be provided on an ASIC or FPGA. The interface according to the invention includes (in both transmit and receive directions) a multi-bit data signal, a multi-bit channel identifier, a packet abort/error signal, a start-of-frame signal, an end-of-frame signal, a data valid signal, and an interface clock. In the transmit direction, the interface also includes a data request signal and a multi-bit PDU length indicator signal. In the receive direction the interface also includes a server signal failure signal.Type: ApplicationFiled: August 23, 2005Publication date: March 1, 2007Inventors: Suvhasis Mukhopadhyay, Santanu Bhattacharya, Vikas Kumar, Kumar Singh, Arunava Dutta, Desikan Srinivasan
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Patent number: 7122952Abstract: A UV-emitting phosphor blend is provided which comprises a mixture of at least two UVA-emitting phosphors selected from SrB4O7:Eu, YPO4:Ce, and BaSi2O5:Pb wherein the sum of the weight percentages of the phosphors in the mixture equals 100%. The phosphor blend may additionally contain an amount of a UVB-emitting phosphor in an amount from 0 to 12 wt. % of the mixture. Tanning lamps containing these blends exhibit increases in initial UVA output and UVA maintenance.Type: GrantFiled: January 20, 2004Date of Patent: October 17, 2006Assignee: Osram Sylvania Inc.Inventors: Arunava Dutta, Aline Tetreault, Leonard V. Dullea, Pascal Horion
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Publication number: 20060186785Abstract: A method of increasing low temperature lumen maintenance of an electrodeless lamp whose glass body has an interior surface with red emitting Y2O3:Eu (YOE) phosphors and green emitting (Ce,Tb)MgAl11O19 (CAT) phosphors thereon, includes coating aluminum oxide directly on the CAT phosphors and/or the YOE phosphors (preferably at least the CAT phosphors). The interior surface of the glass body may also have blue emitting BaMgAl11O17:Eu (BAM) phosphors thereon. The low temperature lumen maintenance is a ratio of (a) lamp lumens at a first number of lamp operating hours to (b) lamp lumens at a reference number of lamp operating hours, when the lamp is operated with a bulb wall temperature of 35° C. or lower.Type: ApplicationFiled: February 23, 2005Publication date: August 24, 2006Applicant: OSRAM SYLVANIA INC.Inventors: Arunava Dutta, Robert Martin
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Patent number: 7030549Abstract: A display device, which can be a plasma display panel or a highly loaded fluorescent lamp, comprises a hollow, translucent glass body containing a medium capable of generating at least several wavelengths of UV radiation. A plurality of phosphors is disposed on the inside surface of the glass body and emits visible radiation upon exposure to the UV radiation. The blue BAM phosphor is most subject to degradation upon long-term exposure to at least one UV wavelength that may be available. The blue BAM along with the red YOE and green CAT phosphors are installed adjacent the inside surface of the glass body to form a first layer; and, the red YOE phosphor is disposed on the first layer to form a second layer, the second layer not being subject to long-term UV degradation. In some embodiments, a layer of alumina may be deposited under the first phosphor layer.Type: GrantFiled: August 9, 2001Date of Patent: April 18, 2006Assignee: Osram Sylvania Inc.Inventor: Arunava Dutta
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Publication number: 20060071590Abstract: An electrodeless lamp (10a), wherein the lamp comprises a closed-loop, tubular lamp envelope (13) with parallel cylindrical glass tubes (14a 16a) containing an arc generating and sustaining medium, means (20a) in the form of magnetic toroids for energizing the medium; and a reflector coating (22) associated with the envelope (13) and affixed thereto. In a preferred embodiment of the invention the reflector coating (22) is on the internal surface (24) of the envelope and comprises a layer of a reflective m, such as alumina. Alternatively, the reflective coating (22) can be applied to the external surface of the envelope.Type: ApplicationFiled: November 24, 2004Publication date: April 6, 2006Applicant: OSRAM SYLVANIA INC.Inventors: Robert Martin, Aline Tetreault, Arunava Dutta, Daniel Marian
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Publication number: 20060041826Abstract: Methods for correcting errors in a GFP-T superblock include buffering the 64 bytes of data in an 8×8 byte buffer, buffering the flag byte in a separate buffer, calculating the CRC remainder, and performing single and double bit error correction in three stages. In the first stage, the CRC remainder is compared to a single bit error syndrome table and if an error is located, it is corrected. In the second stage, the CRC remainder is compared to a double bit error syndrome table and if an error is located, it is corrected. The third stage corrects the second error of a double bit error. The flag byte is processed first, followed by the data bytes, eight bytes at a time.Type: ApplicationFiled: August 23, 2004Publication date: February 23, 2006Inventors: Santanu Bhattacharya, Neeraj Gupta, Yogesh Mittal, Priya Darshini, Arunava Dutta, Suvhasis Mukhopadhyay
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Patent number: 6984931Abstract: A UV-emitting phosphor blend is provided which comprises a mixture of at least two UVA-emitting phosphors selected from SrB4O7:Eu, YPO4:Ce, and BaSi2O5:Pb wherein the sum of the weight percentages of the phosphors in the mixture equals 100%. The phosphor blend may additionally contain an amount of SrCe0.08MgAl11O18 in an amount from 0 to 12 wt. % of the mixture. Tanning lamps containing these blends exhibit increases in initial UVA output and UVA maintenance.Type: GrantFiled: January 21, 2003Date of Patent: January 10, 2006Assignee: Osram Sylvania Inc.Inventors: Arunava Dutta, Aline Tetreault, Leonard V. Dullea, Pascal Horion
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Publication number: 20040155570Abstract: A UV-emitting phosphor blend is provided which comprises a mixture of at least two UVA-emitting phosphors selected from SrB4O7:Eu, YPO4:Ce, and BaSi2O5:Pb wherein the sum of the weight percentages of the phosphors in the mixture equals 100%. The phosphor blend may additionally contain an amount of a UVB-emitting phosphor in an amount from 0 to 12 wt. % of the mixture. Tanning lamps containing these blends exhibit increases in initial UVA output and UVA maintenance.Type: ApplicationFiled: January 20, 2004Publication date: August 12, 2004Applicant: OSRAM SYLVANIA Inc.Inventors: Arunava Dutta, Aline Tetreault, Leonard V. Dullea, Pascal Horion
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Publication number: 20040140754Abstract: A UV-emitting phosphor blend is provided which comprises a mixture of at least two UVA-emitting phosphors selected from SrB4O7:Eu, YPO4:Ce, and BaSi2O5:Pb wherein the sum of the weight percentages of the phosphors in the mixture equals 100%. The phosphor blend may additionally contain an amount of SrCe0.08MgAl11O18 in an amount from 0 to 12 wt. % of the mixture. Tanning lamps containing these blends exhibit increases in initial UVA output and UVA maintenance.Type: ApplicationFiled: January 21, 2003Publication date: July 22, 2004Applicant: OSRAM SYLVANIA Inc.Inventors: Arunava Dutta, Aline Tetreault, Leonard V. Dullea, Pascal Horion
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Publication number: 20040095058Abstract: A display device (10) (FIG. 1) which can be a plasma display panel or a highly loaded fluorescent lamp, comprises a hollow, translucent glass body (12) containing a medium capable of generating at least several wavelengths of UV radiation. A plurality of phosphors is disposed on the inside surface of the glass body, the plurality of phosphors emitting visible radiation upon exposure to the UV radiation. At least one of the plurality of phosphors is subject to degradation upon long-term exposure to one of the at least one of several wavelengths of UV radiation that may be available. The at least one of the plurality of phosphors subject to degradation is installed (FIG. 2) adjacent the inside surface (14) of the glass body to form a first layer (16); and, the remainder of the plurality of phosphors is disposed on the first layer to form a second layer (18), the second layer not being subject to long-term degradation upon exposure to the UV radiation. In some embodiments (FIG.Type: ApplicationFiled: November 20, 2003Publication date: May 20, 2004Inventor: Arunava Dutta
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Patent number: 5441774Abstract: In process for forming a coating of phosphor particles on a fluorescent lamp glass, a polymer is deposited on the phosphor particles and the phosphor particles are entrained in a carrier gas with the polymer in a non-adhering state, and then the phosphor particles are coated on the fluorescent lamp glass with the polymer in an adhering state for retaining the phosphor particles on the fluorescent glass and, the coated fluorescent glass is heated to a temperature above the decomposition temperature of the polymer for removing the polymer and to form a coating of phosphor particles on a fluorescent lamp glass.Type: GrantFiled: May 23, 1994Date of Patent: August 15, 1995Assignee: Osram Sylvania Inc.Inventors: Arunava Dutta, Leonard V. Dullea
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Patent number: 5378495Abstract: A method for coating a fluorescent lamp with an aqueous suspension of a multi-component phosphor blend wherein the isoelectric point(IEP) of at least one of the individual phosphors is separated by at least two pH units from the effective IEP of the other phosphors. The method involving altering the IEP of the first phosphor to within about two pH units of the effective IEP of the other phosphors, adding the modified phosphor to an aqueous suspension of the other phosphors, the aqueous suspension having a pH outside the range defined by the modified IEP and the effective IEP to inhibit flocculation, and coating a fluorescent lamp.Type: GrantFiled: February 1, 1994Date of Patent: January 3, 1995Assignee: Osram Sylvania Inc.Inventor: Arunava Dutta
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Patent number: 5362524Abstract: A method for providing an electric field having a desirable configuration and strength for the electrostatic coating of phosphors on a fluorescent glass envelope at a controlled temperature comprising enclosing a fluorescent glass envelope with at least one electrically conductive charge retaining member at a desired temperature for the duration of the actual electrostatic coating operation wherein charged phosphor particles are attracted to the interior of the glass envelope and the charge is dissipated to the charge retaining member which remains substantially electrically isolated during the coating process. The process is most suitable adapted to an asymmetric fluorescent glass envelope.Type: GrantFiled: December 29, 1992Date of Patent: November 8, 1994Assignee: GTE Products CorporationInventors: Arunava Dutta, Mark A. Morrison, Leonard V. Dullea, Richard A. Kingston, Joseph A. Olsen
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Patent number: 5314723Abstract: In process for forming a coating of phosphor particles on a fluorescent lamp glass, a polymer is deposited on the phosphor particles and the phosphor particles are entrained in a carrier gas with the polymer in a non-adhering state, and then the phosphor particles are coated on the fluorescent lamp glass with the polymer in an adhering state for retaining the phosphor particles on the fluorescent glass and, the coated fluorescent glass is heated to a temperature above the decomposition temperature of the polymer for removing the polymer and to form a coating of phosphor particles on a fluorescent lamp glass.Type: GrantFiled: June 9, 1992Date of Patent: May 24, 1994Assignee: GTE Products CorporationInventors: Arunava Dutta, Lenoard V. Dullea
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Patent number: 5302318Abstract: This invention concerns the addition of fibrous alumina material to a phosphor or phosphor mixture before fluidization as a means of increasing the cohesiveness of the phosphor or phosphor mixture. The increase in cohesiveness can be controlled by varying the concentration of the fiber in the mixture.Type: GrantFiled: July 30, 1991Date of Patent: April 12, 1994Assignee: GTE Products CorporationInventors: Arunava Dutta, Leonard V. Dullea
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Patent number: 5277245Abstract: In method for enhancing heat transfer in a bed of powder comprising cohesive Geldart type C particles confined by a wall of a vertically oriented container and being fluidized by the upward flow of fluidizing gas through the bed of powder, heat is transferred between the bed of powder and the wall of the container, and, prior to fluidizing the particles, the fluidizing gas is selected so as to comprise a sufficient amount of helium, hydrogen, or mixtures thereof for obtaining a thermal conductivity of the fluidizing gas of at least four times that of nitrogen for enhancing heat transfer between the wall and the bed.Type: GrantFiled: October 29, 1992Date of Patent: January 11, 1994Assignee: GTE Products Corp.Inventors: Arunava Dutta, Leonard V. Dullea
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Patent number: 5234710Abstract: A skin tanning fluorescent lamp having a coating of a uniform and homogeneous deflocculated physical mixture of a first and second phosphor where the first phosphor has a desired emission in the spectral region from about 320 to about 400 nanometers and the second phosphor has a desired emission in the spectral region from about 280 to about 320 nanometers, said first phosphor has a first isoelectric point at a first pH and the second phosphor has a second isoelectric point at a second pH. The first and said second pH form a range. The deflocculated coating is stabilized by deflocculating the first and second phosphors at a third pH sufficiently outside of range to produce a resulting coating consistently having desirable emission during production.Type: GrantFiled: December 13, 1991Date of Patent: August 10, 1993Assignee: GTE Products CorporationInventors: Arunava Dutta, Paul W. Salvi