1
Samuel A M Lucente, Peruvemba S Balasubramanian, Richard F Sapper, Nathan J Lee: Rotatable pen-based computer with automatically reorienting display. International Business Machines Corporation, Calfee Halter & Griswold, October 15, 1996: US05566098 (116 worldwide citation)

A pen-based computer including a housing and a flat display integral therewith. The flat display can display an image corresponding to text, data and graphic information in several orientations. A plurality of switches enables the user to select an orientation for the image relative to the orientati ...


2
Peruvemba S Balasubramanian, Nathan J Lee, Scott D Lekuch: Multiprotocol directed infrared communication controller. International Business Machines Corporation, Perman & Green, September 17, 1996: US05557634 (39 worldwide citation)

A directed infrared (IR) communication controller which supports interoperability among protocols and which can communicate at baud rates of up to 2.34 Mbps while supporting the IRDA standard as well as Sharp's 500 KHz ASK, NRZI, and Biphase modulated IR systems. A method for automatically determini ...


3
Peruvemba S Balasubramanian, Stephen B Greenspan: Electrically programmable logic array. International Business Machines Corporation, John E Hoel, December 4, 1979: US04177452 (27 worldwide citation)

A write once, read only electrically programmable storage circuit is disclosed, which employs a flip-flop circuit to store the programmed conductive state of the array device, by means of a blocking transistor connected between the array device and one node of the flip-flop, the control electrode of ...


4
Samuel A M Lucente, Peruvemba S Balasubramanian, Richard F Sapper, Nathan J Lee: Rotatable pen-based computer. International Business Machines Corporation, Calfee Halter & Griswold, July 11, 1995: US05432720 (26 worldwide citation)

A pen-based computer includes a housing and a flat panel display integral therewith. The computer housing has a slanted parallelpiped configuration with polyhedron-shaped top and bottom surfaces and parallelogram-shaped side and end surfaces interconnecting the top and bottom surfaces. The side and ...


5
Peruvemba S Balasubramanian, Claude R Bertin, Stephen B Greenspan: Merged array PLA device, circuit, fabrication method and testing technique. International Business Machines Corporation, John E Hoel, February 20, 1979: US04140967 (24 worldwide citation)

A merged AND/OR array PLA is disclosed wherein the merger is accomplished by forming the gates of the FET devices in the AND array by means of an upper conductor layer and the gates of the FET devices in the OR array, which are connected to the drain of the devices in the AND array, by means of lowe ...


6
Peruvemba S Balasubramanian, Nathan J Lee, Scott D Lekuch: Flash NRZI infrared modem. International Business Machines Corporation, Perman & Green, February 11, 1997: US05602873 (8 worldwide citation)

A modulation scheme and system, compatible with both the asynchronous IRDA mode and the synchronous mode of IR communication, involves Non-Return-to-Zero-Inverted (NRZI) and Flash pulse encoding in conjunction with zero-bit stuffing. A digital data stream has a zero-bit inserted therein, before NRZI ...


7
Peruvemba S Balasubramanian, Stephen B Greenspan, Krishnamurthi Venkataraman: Generalized performance power optimized PLA circuits. International Business Machines Corporation, John E Hoel, February 20, 1979: US04140921 (8 worldwide citation)

An array of parallel FET load circuits on an IC (integrated circuit) chip can have their respective signal delays equalized where their nodal capacitances are different or alternately can have their signal delays set for different durations to meet the needs of a subsequent circuit, by adjusting the ...


8
Peruvemba S Balasubramanian, Nathan J Lee, Scott D Lekuch: ASK demodulator implemented with digital bandpass filter. International Business Machines Corporation, Perman & Green, July 2, 1996: US05532641 (7 worldwide citation)

Amplitude Shift Keying (ASK) modulation system and method with an ASK demodulator that is implemented with an analog-emulating digital bandpass filter. The bandpass filter also generates a carrier detect signal when it detects a carrier frequency that passes the filter pass band.


9
Peruvemba S Balasubramanian, Nathan J Lee, Scott D Lekuch: IR FM modem with flash modulation. International Business Machines Corporation, Perman & Green, March 11, 1997: US05610947 (6 worldwide citation)

Biphase or FM encoding is combined with Flash modulation in infrared (IR) communication. By shrinking the coded pulse width in the modulation process, power dissipation is effectively reduced to the point where FM encoding can be advantageously adapted to IR communication in a synchronous communicat ...


10
Peruvemba S Balasubramanian, Edwin C Grazier, John D Henke, Robert P Latham, Martin J Myers: Read only memory with optimized dimension for improved performance and chip area utilization. International Business Machines Corporation, December 5, 1978: UST0977006

a read only memory on a semiconductor substrate having metal word lines and diffused bit lines with optimized dimensions for a selected performance and storage capacity with the metal lines being along an X dimension and the diffused lines being orthogonally related to the metal lines along a Y dime ...