Paul Ka Lung Cheng

US Patent:

6925524, Aug 2, 2005

Filed:

Mar 20, 2003

Appl. No.:

10/249189

Inventors:

Nelson L. Chow - Mountain View CA, US
David L. Amey - Los Angeles CA, US
Paul Cheng - San Jose CA, US

Assignee:

Integrated Silicon Solution, Inc. - Santa Clara CA

International Classification:

G06F012/08

US Classification:

711108

Abstract:

A relocation system to associatively search a database lookup table with a search key to addressably retrieve a corresponding associate content table record as a search result. The relocation system is implemented in search engine devices having associative memory (e. g. , CAM) having one or more sections. The search engine devices employ relocation values when calculating addresses, one per section per device, with the relocation values optionally pre-calculated and stored in relocation registers. The search engine devices may be cascaded to construct a larger search engine. The search engine is typically used with a processor and addressable memory (e. g. , RAM or ROM). In particular, the relocation system permits multiple databases to be concurrently stored and worked with in the associative and addressable memory.

US Patent:

7043600, May 9, 2006

Filed:

May 12, 2003

Appl. No.:

10/249842

Inventors:

Nelson L. Chow - Mountain View CA, US
Paul C. Cheng - San Jose CA, US

Assignee:

Integrated Silison Solution, Inc. - Santa Clara CA

International Classification:

G06F 12/00

US Classification:

711108, 713160

Abstract:

CAM devices that can be cascaded together to form CAM systems of different sizes are disclosed. The system has one or more clusters of M CAM devices, each device including (M−1) disable connections. Disable signals are used to avoid contention so that one CAM device generates the system output on a shared bus. To reduce pin count, the CAM device of priority N within each cluster has (N−1) of its disable connections programmed as inputs for disable-in signals received from higher-priority CAM devices, and its remaining (M−N) disable connections programmed as outputs for disable-out signals provided to lower-priority CAM devices. Some embodiments include two or more clusters of CAM devices and a controller. In some embodiments, the CAM system works as fast as a single CAM device. Some embodiments impose no architectural limits on the number of CAM devices that can be cascaded together.

US Patent:

7054995, May 30, 2006

Filed:

Apr 23, 2003

Appl. No.:

10/249598

Inventors:

Nelson L. Chow - Mountain View CA, US
Paul Cheng - San Jose CA, US

Assignee:

Integrated Silicon Solution, Inc. - Santa Clara CA

International Classification:

G06F 12/00

US Classification:

711108, 365 49

Abstract:

A content addressable memory (CAM) system includes CAM banks that can be linked together in a series to form a CAM module. Each CAM bank includes a CAM array with rows. In a lookup operation, each row asserts a field-match signal when a field from a key matches the field of a CAM entry held in the row. Each CAM bank receives a link-control signal, each received from the preceding CAM bank match-in signals for the rows, and each generates match-out signals for the rows. Some embodiments dynamically configure the CAM system into one or more independent CAM modules of various widths, according to data held in a configuration register or to the current value of the key or other search information. Some embodiments include multiple priority encoders that can be coupled to the match-out signals of dynamically selected CAM banks, thus advantageously allowing parallel lookup operations in the CAM modules.

US Patent:

20130248610, Sep 26, 2013

Filed:

Mar 20, 2012

Appl. No.:

13/506017

Inventors:

Paul Cheng - City of Industry CA, US

International Classification:

B05B 15/00

US Classification:

239 1, 239289

Abstract:

A device discharges fragrance during the dispensing of toilet seat covers generally includes a retainer for holding the toilet seat covers and at least one scent reservoir. The scent reservoir is disposed in the inside of the retainer and in contact with the toilet seat covers. At least one opening is also disposed in the retainer and defines an opening for dispensing the seat covers and discharging fragrance.In the process of usage of the seat cover, a user removes the seat cover from the retainer by pulling the seat cover through the opening. The pulling of the seat cover creates friction on the scent reservoir and enables the fragrance particles to be released. The fragrance air flows out from the opening with the seat cover and disburses scented air into the ambient air.

US Patent:

51323958, Jul 21, 1992

Filed:

Jan 30, 1990

Appl. No.:

7/472198

Inventors:

Tito T. Serafini - Redondo Beach CA
Paul G. Cheng - Rancho Palos Verdes CA
Kenneth K. Ueda - Lomita CA
Ward F. Wright - Redondo Beach CA

Assignee:

TRW Inc. - Redondo Beach CA

International Classification:

C08G 6926
C08G 6308
C08G 7500
C08L 6700

US Classification:

528353

Abstract:

Polyimides having a high thermal and oxidative stability are prepared by reacting a mixture of monomers comprising (a) a dialkyl, trialkyl, or te This invention was made with Government support under F33615-88-C-5409 awarded by the Department of the Air force. The Government has certain rights in this invention.

US Patent:

51497727, Sep 22, 1992

Filed:

Jan 22, 1992

Appl. No.:

7/824090

Inventors:

Tito T. Serafini - Redondo Beach CA
Paul G. Cheng - Rancho Palos Verdes CA
Kenneth K. Ueda - Lomita CA
Ward F. Wright - Redondo Beach CA

Assignee:

TRW Inc. - Redondo Beach CA

International Classification:

C08G 6926
C08G 6308
C08G 7500
C08L 6700

US Classification:

528353

Abstract:

Polyimides having a high thermal and oxidative stability are prepared by reacting a mixture of monomers comprising (a) a dialkyl, trialkyl, or tetraalkylester of an aromatic tetracarboxylic acid, (b) an aromatic diamine, and (c) an end cap compound. The ratio of (a), (b), and (c) is chosen so that upon heating the mixtures, low molecular weight prepolymers are formed, the prepolymers having only one end cap radical and being suitable for chain extension and crosslinking to form high molecular weight, thermally stable polyimides. Upon heating, the prepolymers form polyimide resins, which can have T. sub. g in excess of 600. degree. F. and superior physical properties.

US Patent:

50915053, Feb 25, 1992

Filed:

Jan 30, 1990

Appl. No.:

7/472036

Inventors:

Tito T. Serafini - Redondo Beach CA
Paul G. Cheng - Rancho Palos Verdes CA
Kenneth K. Ueda - Lomita CA
Ward F. Wright - Redondo Beach CA

Assignee:

TRW Inc. - Redondo Beach CA

International Classification:

C08G 6926
C08G 6308
C08G 7500
C08L 6700

US Classification:

528353

Abstract:

Polyimides having a high thermal and oxidative stability are prepared by reacting a mixture of monomers comprising (a) a dialkyl, trialkyl, or tetraalkylester of an aromatic tetracarboxylic acid, (b) an aromatic diamine, and (c) an end cap compound. The ratio of (a), (b), and (c) is chosen so that upon heating the mixtures, low molecular weight prepolymers are formed, the prepolymers having only one end cap radical and being suitable for chain extension and crosslinking to form high molecular weight, thermally stable polyimides. Upon heating, the prepolymers form polyimide resins, which can have T. sub. g in excess of 600. degree. F. and superior physical properties.

US Patent:

51497603, Sep 22, 1992

Filed:

Jan 22, 1992

Appl. No.:

7/824089

Inventors:

Tito T. Serafini - Redondo Beach CA
Paul G. Cheng - Rancho Palos Verdes CA
Kenneth K. Ueda - Lomita CA
Ward F. Wright - Redondo Beach CA

Assignee:

TRW Inc. - Redondo Beach CA

International Classification:

C08G 6926
C08G 6308
C08G 7500
C08G 6700

US Classification:

528353

Abstract:

Polyimides having a high thermal and oxidative stability are prepared by reacting a mixture of monomers comprising (a) a dialkyl, trialkyl, or tetraalkylester of an aromatic tetracarboxylic acid, (b) an aromatic diamine, and (c) an end cap compound. The ratio of (a), (b), and (c) is chosen so that upon heating the mixtures, low molecular weight prepolymers are formed, the prepolymers having only one end cap radical and being suitable for chain extension and crosslinking to form high molecular weight, thermally stable polyimides. Upon heating, the prepolymers form polyimide resins, which can have T. sub. g in excess of 600. degree. F. and superior physical properties.