Patents by Inventor Charles Alpert
Charles Alpert 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: 10216880Abstract: Methods and systems of optimization of and Integrated Circuit (IC) design disclosed herein result in a power efficient clustering of circuit devices. The methods may depart from the conventional geometric clustering using a nearest neighbor approach when wiring flops to local clock buffers. To reduce the number of clock-gaters, the methods in one embodiment use a grouping of flops wired to a common clock-gater to form nodes, which are then wired to the local clock buffers based on a load-balancing process. In another embodiment, the methods use a local cleanup process to rewire the nodes between neighboring clock buffers to further reduce the amount of clock-gaters.Type: GrantFiled: July 15, 2016Date of Patent: February 26, 2019Assignee: Cadence Design Systems, Inc.Inventors: Wen-Hao Liu, Zhuo Li, Charles Alpert, Brian Wilson
-
Patent number: 10095824Abstract: Disclosed herein are systems and methods to construct a symmetric clock-distribution H-tree in upper layers of an integrated circuit (IC), which may have complicated routing and/or placement blockages. The systems and methods disclosed herein may implement concomitant bottom-up wiring and top-down rewiring to achieve a clock-distribution tree symmetrically balanced across all of the hierarchical levels while respecting the complicated routing and/or placement blockages. Such symmetrically balanced clock-tree ensures that a clock-signal reaches all of the clock-sinks simultaneously or near simultaneously thereby minimizing clock-skew across the clock-sinks. The minimal skew symmetric clock-distribution H-tree may therefore be used for higher performance and high speed ICs.Type: GrantFiled: October 13, 2016Date of Patent: October 9, 2018Assignee: Cadence Design Systems, Inc.Inventors: Zhuo Li, Wen-Hao Liu, Charles Alpert, Brian Wilson
-
Patent number: 10031994Abstract: Disclosed herein are systems and methods to reduce wirelength and congestion in an integrated circuit (IC) design. The systems and methods disclosed herein may be implemented during a detailed placement stage of IC design to identify and select a cell for relocation and determine an area of interest to which the cell can be relocated. The systems and methods may identify one or more potential locations within the area of interest where the cell can be relocated to, and then determine a cost based upon the wirelength and/or congestion for the selected cell, at each of the one or more potential locations. Upon determining that a potential location may have a lower cost compared to the original location of the selected cell, the systems and methods may relocate the selected cell to the potential location.Type: GrantFiled: July 25, 2016Date of Patent: July 24, 2018Assignee: Cadence Design Systems, Inc.Inventors: Wen Hao Liu, Jhih-Rong Gao, Mehmet Yildiz, Charles Alpert, Zhuo Li
-
Patent number: 9238121Abstract: A catheter shaft with an improved manifold bond and methods for making and using the same. The catheter shaft may include a sleeve disposed, for example, near its proximal end. The sleeve may include a first layer that is attached to the catheter shaft and a second layer to which a hub or manifold may be attached.Type: GrantFiled: September 23, 2014Date of Patent: January 19, 2016Assignee: BOSTON SCIENTIFIC SCIMED, INC.Inventors: Huey Quoc Chan, Ting Tina Ye, Lawrence Charles Alpert, Sean McFerran, Roland S. Mompar
-
Publication number: 20150011950Abstract: A catheter shaft with an improved manifold bond and methods for making and using the same. The catheter shaft may include a sleeve disposed, for example, near its proximal end. The sleeve may include a first layer that is attached to the catheter shaft and a second layer to which a hub or manifold may be attached.Type: ApplicationFiled: September 23, 2014Publication date: January 8, 2015Inventors: Huey Quoc Chan, Ting Tina Ye, Lawrence Charles Alpert, Sean McFerran, Roland S. Mompar
-
Patent number: 8858529Abstract: A catheter shaft with an improved manifold bond and methods for making and using the same. The catheter shaft may include a sleeve disposed, for example, near its proximal end. The sleeve may include a first layer that is attached to the catheter shaft and a second layer to which a hub or manifold may be attached.Type: GrantFiled: August 31, 2012Date of Patent: October 14, 2014Assignee: Boston Scientific Scimed, Inc.Inventors: Huey Quoc Chan, Ting Tina Ye, Lawrence Charles Alpert, Sean McFerran, Roland S. Mompar
-
Patent number: 8795255Abstract: A catheter comprising an elongate tubular member having a proximal end, a distal end, and a passageway defining a lumen extending between the proximal and distal ends. The elongate tubular member comprises a relatively stiff proximal section and a relatively flexible distal section. The proximal section includes an inner tubular liner, a first stiffener comprising a metal alloy, and a second stiffener comprising a non-metal alloy. The first and second stiffeners are coaxially wound exterior to the proximal inner liner. The distal section includes a distal inner tubular liner and the second stiffener coaxially wound exterior to the distal inner liner. The first stiffener terminates before reaching the distal section.Type: GrantFiled: November 12, 2012Date of Patent: August 5, 2014Assignee: Boston Scientific Scimed, Inc.Inventors: Lex P. Jansen, Thomas Yung-Hui Chien, Perry Alvin Fukui, Jeffrey A. Sarge, Lawrence Charles Alpert
-
Publication number: 20120323189Abstract: A catheter shaft with an improved manifold bond and methods for making and using the same. The catheter shaft may include a sleeve disposed, for example, near its proximal end. The sleeve may include a first layer that is attached to the catheter shaft and a second layer to which a hub or manifold may be attached.Type: ApplicationFiled: August 31, 2012Publication date: December 20, 2012Applicant: BOSTON SCIENTIFIC SCIMED, INC.Inventors: Huey Quoc Chan, Ting Tina Ye, Lawrence Charles Alpert, Sean McFerran, Roland S. Mompar
-
Patent number: 8317772Abstract: A catheter comprising an elongate tubular member having a proximal end, a distal end, and a passageway defining a lumen extending between the proximal and distal ends. The elongate tubular member comprises a relatively stiff proximal section and a relatively flexible distal section. The proximal section includes an inner tubular liner, a first stiffener comprising a metal alloy, and a second stiffener comprising a non-metal alloy. The first and second stiffeners are coaxially wound exterior to the proximal inner liner. The distal section includes a distal inner tubular liner and the second stiffener coaxially wound exterior to the distal inner liner. The first stiffener terminates before reaching the distal section.Type: GrantFiled: March 10, 2011Date of Patent: November 27, 2012Assignee: Target Therapeutics, Inc.Inventors: Lex P. Jansen, Thomas Yung-Hui Chien, Perry Alvin Fukui, Jeffrey A. Sarge, Lawrence Charles Alpert
-
Patent number: 8257343Abstract: A catheter shaft with an improved manifold bond and methods for making and using the same. The catheter shaft may include a sleeve disposed, for example, near its proximal end. The sleeve may include a first layer that is attached to the catheter shaft and a second layer to which a hub or manifold may be attached.Type: GrantFiled: February 10, 2010Date of Patent: September 4, 2012Assignee: Boston Scientific Scimed, IncInventors: Huey Quoc Chan, Ting Tina Ye, Lawrence Charles Alpert, Sean McFerran, Roland S. Mompar
-
Publication number: 20110172643Abstract: A catheter comprising an elongate tubular member having a proximal end, a distal end, and a passageway defining a lumen extending between the proximal and distal ends. The elongate tubular member comprises a relatively stiff proximal section and a relatively flexible distal section. The proximal section includes an inner tubular liner, a first stiffener comprising a metal alloy, and a second stiffener comprising a non-metal alloy. The first and second stiffeners are coaxially wound exterior to the proximal inner liner. The distal section includes a distal inner tubular liner and the second stiffener coaxially wound exterior to the distal inner liner. The first stiffener terminates before reaching the distal section.Type: ApplicationFiled: March 10, 2011Publication date: July 14, 2011Applicant: TARGET THERAPEUTICS, INC.Inventors: Lex P. Jansen, Thomas Yung-Hui Chien, Perry Alvin Fukui, Jeffrey A. Sarge, Lawrence Charles Alpert
-
Patent number: 7909812Abstract: A catheter comprising an elongate tubular member having a proximal end, a distal end, and a passageway defining a lumen extending between the proximal and distal ends. The elongate tubular member comprises a relatively stiff proximal section and a relatively flexible distal section. The proximal section includes an inner tubular liner, a first stiffener comprising a metal alloy, and a second stiffener comprising a non-metal alloy. The first and second stiffeners are coaxially wound exterior to the proximal inner liner. The distal section includes a distal inner tubular liner and the second stiffener coaxially wound exterior to the distal inner liner. The first stiffener terminates before reaching the distal section.Type: GrantFiled: September 6, 2006Date of Patent: March 22, 2011Assignee: Target Therapeutics, Inc.Inventors: Lex P. Jansen, Thomas Yung-Hui Chien, Perry Alvin Fukui, Jeffrey A. Sarge, Lawrence Charles Alpert
-
Publication number: 20100145311Abstract: A catheter shaft with an improved manifold bond and methods for making and using the same. The catheter shaft may include a sleeve disposed, for example, near its proximal end. The sleeve may include a first layer that is attached to the catheter shaft and a second layer to which a hub or manifold may be attached.Type: ApplicationFiled: February 10, 2010Publication date: June 10, 2010Applicant: BOSTON SCIENTIFIC SCIMED, INC.Inventors: Huey Quoc Chan, Ting Tina Ye, Lawrence Charles Alpert, Sean McFerran, Roland S. Mompar
-
Patent number: 7662144Abstract: A catheter shaft with an improved manifold bond and methods for making and using the same. The catheter shaft may include a sleeve disposed, for example, near its proximal end. The sleeve may include a first layer that is attached to the catheter shaft and a second layer to which a hub or manifold may be attached.Type: GrantFiled: June 22, 2004Date of Patent: February 16, 2010Assignee: Boston Scientific Scimed, Inc.Inventors: Huey Quoc Chan, Tina Ye, Lawrence Charles Alpert, Sean McFerran, Roland S. Mompar
-
Publication number: 20080072202Abstract: A method of determining buffer insertion locations in an integrated circuit design establishes candidate locations for inserting buffers into a net, and selects buffer insertion locations from among the candidates based on slew constraints. The selection of buffer insertion locations preferably optimizes slack and buffer cost while keeping slew from any buffered node to any sink less than a required slew rate. The slew analysis computes an output slew SL(v) of a given buffer b inserted at a node v as SL(v)=RS(b)·C(v)+KS(b), where C(v) is the downstream capacitance at v, RS(b) is the slew resistance of buffer b, and KS(b) is the intrinsic slew of buffer b. The delay through a given buffer may also be computed based on signal polarity. However, the invention still preferably uses worst-case slew resistance and intrinsic slew in considering the slew constraints.Type: ApplicationFiled: November 29, 2007Publication date: March 20, 2008Inventors: Charles Alpert, Zhuo Li, Stephen Quay
-
Publication number: 20070143724Abstract: A method, apparatus, and computer program product for cell placement in an integrated circuit design that use the principles of diffusion.Type: ApplicationFiled: December 15, 2005Publication date: June 21, 2007Inventors: Charles Alpert, Haoxing Ren, Paul Villarrubia
-
Patent number: 7104979Abstract: A catheter comprising an elongate tubular member having a proximal end, a distal end, and a passageway defining a lumen extending between the proximal and distal ends. The elongate tubular member comprises a relatively stiff proximal section and a relatively flexible distal section. The proximal section includes an inner tubular liner, a first stiffener comprising a metal alloy, and a second stiffener comprising a non-metal alloy. The first and second stiffeners are coaxially wound exterior to the proximal inner liner. The distal section includes a distal inner tubular liner and the second stiffener coaxially wound exterior to the distal inner liner. The first stiffener terminates before reaching the distal section.Type: GrantFiled: February 19, 2002Date of Patent: September 12, 2006Assignee: Target Therapeutics, Inc.Inventors: Lex P. Jansen, Thomas Yung-Hui Chien, Perry Alvin Fukui, Jeffrey A. Sarge, Lawrence Charles Alpert
-
Publication number: 20060156266Abstract: A method of estimating routing congestion between pins in a net of an integrated circuit design, by establishing one or more potential routes between the pins which pass through buckets in the net, assigning a probabilistic usage to each bucket based on any partial blockage of the wiring tracks in each bucket, and computing routing congestion for each bucket using its probabilistic usage. When the net is a two-pin net that is a part of a larger multi-pin net, and a tree is constructed to bridge the two-pin net to another pin of the multi-pin net. The routing congestion for each bucket is computed as a ratio of the bucket usage to bucket capacity. For L-shaped routes (having at least one bend in a bucket), the probabilistic usage is proportional to a scale factor a which is a ratio of a minimum number of available wiring tracks for a given route to a sum of minimum numbers of available wiring tracks for all possible routes.Type: ApplicationFiled: January 11, 2005Publication date: July 13, 2006Inventors: Charles Alpert, Zhuo Li, Stephen Quay
-
Publication number: 20060112364Abstract: A method of determining buffer insertion locations in an integrated circuit design establishes candidate locations for inserting buffers into a net, and selects buffer insertion locations from among the candidates based on slew constraints. The selection of buffer insertion locations preferably optimizes slack and buffer cost while keeping slew from any buffered node to any sink less than a required slew rate. The slew analysis computes an output slew SL(v) of a given buffer b inserted at a node v as SL(v)=RS(b)·C(v)+KS(b), where C(v) is the downstream capacitance at v, RS(b) is the slew resistance of buffer b, and KS(b) is the intrinsic slew of buffer b. The delay through a given buffer may also be computed based on signal polarity. However, the invention still preferably uses worst-case slew resistance and intrinsic slew in considering the slew constraints.Type: ApplicationFiled: November 22, 2004Publication date: May 25, 2006Applicant: INTERNATIONAL BUSINESS MACHINES CORPORATIONInventors: Charles Alpert, Zhuo Li, Stephen Quay
-
Publication number: 20060031804Abstract: A placement technique for designing a layout of an integrated circuit by calculating clustering scores for different pairs of objects in the layout based on connections of two objects in a given pair and the sizes of the two objects, then grouping at least one of the pairs of objects into a cluster based on the clustering scores, partitioning the objects as clustered and ungrouping the cluster after partitioning. The pair of objects having the highest clustering score are grouped into the cluster, and the clustering score is directly proportional to the total weight of connections between the two objects in the respective pair. The clustering scores are preferably inserted in a binary heap to identify the highest clustering score. After grouping, the clustering score for any neighboring object of a clustered object is marked to indicate that the clustering score is invalid and must be recalculated. The calculating and grouping are then repeated iteratively based on the previous clustered layout.Type: ApplicationFiled: November 22, 2004Publication date: February 9, 2006Applicant: INTERNATIONAL BUSINESS MACHINES CORPORATIONInventors: Charles Alpert, Gi-Joon Nam, Sherief Reda, Paul Villarrubia