David M Jacobson

US Patent:

6652485, Nov 25, 2003

Filed:

May 31, 2000

Appl. No.:

09/585885

Inventors:

Henri A. Gaudoin - Mountain View CA
David T. Jacobson - San Jose CA

Assignee:

Advanced Cardiovascular Systems, Inc. - Santa Clara CA

International Classification:

A61M 3100

US Classification:

60410307, 604916

Abstract:

An inflatable member suitable for angioplasty or other medical procedures comprising asymmetric conic shoulder portions that optimize the wrapped profile. The asymmetry distributes the inflatable member material of the shoulder portions over a larger area to reduce the inflatable member profile and improve flexibility. Optionally, the asymmetrical shoulder portions preformed creases to facilitate folding. In an alternate embodiment, each shoulder portion has at least three radially spaced preformed creases to optimize folding in the shoulder portion. The invention also comprises methods of forming such inflatable members, the methods generally comprising using molds having the requisite characteristics. Specifically, the mold may have ridges within the areas corresponding the shoulder portions to form the preformed creases when the inflatable member is blow molded.

US Patent:

7324553, Jan 29, 2008

Filed:

Sep 30, 2003

Appl. No.:

10/676631

Inventors:

Roopesh R. Varier - Sunnyvale CA, US
Guy Riddle - Los Gatos CA, US
David Jacobson - Durham NC, US

Assignee:

Packeteer, Inc. - Cupertino CA

International Classification:

H04J 3/16
H04L 12/28
G01R 31/08

US Classification:

370468, 370235, 3703952, 370420

Abstract:

Methods, apparatuses and systems allowing for dynamic bandwidth management schemes responsive to the state of a plurality of access links in redundant network topologies. In one embodiment, the present invention provides a bandwidth management device that periodically queries routing systems associated with access links, conceptually grouped into a virtual access link, to monitor that load of the access links and, depending on the detected load, adjust the configuration of the bandwidth management device to avoid overloading one or more of the access links. Embodiments of the present invention increases network efficiency and help network traffic to flow more smoothly with higher throughput. In one embodiment, the dynamic link control functionality is invoked when any given access link reaches a threshold capacity level. Assuming that network traffic will scale in the same ratio as presently observed, the present invention calculates the maximum traffic that can be let through so that no network interface or access link is overloaded.

US Patent:

7366101, Apr 29, 2008

Filed:

Jun 30, 2003

Appl. No.:

10/611573

Inventors:

Roopesh R. Varier - Sunnyvale CA, US
David Jacobson - Durham NC, US
Guy Riddle - Los Gatos CA, US

Assignee:

Packeteer, Inc. - Cupertino CA

International Classification:

H04J 3/14
H04J 3/06
H04L 12/26
H04L 12/28
H04L 12/56

US Classification:

370241, 370401, 370503

Abstract:

Methods, apparatuses and systems directed to a network traffic synchronization mechanism facilitating the deployment of network devices in redundant network topologies. In certain embodiments, when a first network device directly receives network traffic, it copies the network traffic and transmits it to at least one partner network device. The partner network device processes the copied network traffic, just as if it had received it directly, but, in one embodiment, discards the traffic before forwarding it on to its destination. In one embodiment, the partner network devices are operative to exchange directly received network traffic. As a result, the present invention provides enhanced reliability and seamless failover. Each unit, for example, is ready at any time to take over for the other unit should a failure occur. As discussed below, the network traffic synchronization mechanism can be applied to a variety of network devices, such as firewalls, gateways, network routers, and bandwidth management devices.

US Patent:

7599283, Oct 6, 2009

Filed:

Jun 1, 2004

Appl. No.:

10/858340

Inventors:

Roopesh R. Varier - Sunnyvale CA, US
James J. Stabile - Los Altos CA, US
Paul Leslie Archard - Kelowna, CA
Guy Riddle - Los Gatos CA, US
David Jacobson - Durham NC, US

Assignee:

Packeteer, Inc. - Cupertino CA

International Classification:

G01R 31/08
H04L 12/28
H04L 12/26
H04J 3/18
G06F 15/173

US Classification:

370216, 370235, 370254, 370477, 709223

Abstract:

Synchronization of network traffic compression mechanisms deployed in redundant network topologies. In one implementation, the present invention features the synchronization of compression statistics on redundant network devices to facilitate failover and load sharing operations in the management of data flows traversing computer network environments. In one implementation, compression meta data is appended to synchronization packets and transmitted to one or more partner or redundant network devices. The receiving network devices use the compression meta data to synchronize one or more data flow control processes or data structures. Implementations of the present invention also feature process flows that increase the efficiency of synchronizing compression related operations.

US Patent:

7773530, Aug 10, 2010

Filed:

Mar 11, 2008

Appl. No.:

12/046089

Inventors:

Roopesh R. Varier - Sunnyvale CA, US
David Jacobson - Durham NC, US
Guy Riddle - Los Gatos CA, US

Assignee:

Packeteer, Inc. - Cupertino CA

International Classification:

H04J 3/14
H04J 3/06
H04L 12/28
H04L 12/56

US Classification:

370241, 370401, 370503

Abstract:

Methods, apparatuses and systems directed to a network traffic synchronization mechanism facilitating the deployment of network devices in redundant network topologies. In certain embodiments, when a first network device directly receives network traffic, it copies the network traffic and transmits it to at least one partner network device. The partner network device processes the copied network traffic, just as if it had received it directly, but, in one embodiment, discards the traffic before forwarding it on to its destination. In one embodiment, the partner network devices are operative to exchange directly received network traffic. As a result, the present invention provides enhanced reliability and seamless failover. Each unit, for example, is ready at any time to take over for the other unit should a failure occur. As discussed below, the network traffic synchronization mechanism can be applied to a variety of network devices, such as firewalls, gateways, network routers, and bandwidth management devices.

US Patent:

20110103407, May 5, 2011

Filed:

Aug 10, 2010

Appl. No.:

12/854153

Inventors:

Roopesh R. Varier - Sunnyvale CA, US
David Jacobson - Durham NC, US
Guy Riddle - Los Gatos CA, US

Assignee:

PACKETEER, INC. - Sunnyvale CA

International Classification:

H04J 3/06

US Classification:

370503

Abstract:

Methods, apparatuses and systems directed to a network traffic synchronization mechanism facilitating the deployment of network devices in redundant network topologies. In certain embodiments, when a first network device directly receives network traffic, it copies the network traffic and transmits it to at least one partner network device. The partner network device processes the copied network traffic, just as if it had received it directly, but, in one embodiment, discards the traffic before forwarding it on to its destination. In one embodiment, the partner network devices are operative to exchange directly received network traffic. As a result, the present invention provides enhanced reliability and seamless failover. Each unit, for example, is ready at any time to take over for the other unit should a failure occur. As discussed below, the network traffic synchronization mechanism can be applied to a variety of network devices, such as firewalls, gateways, network routers, and bandwidth management devices.

US Patent:

20110305333, Dec 15, 2011

Filed:

Jun 9, 2011

Appl. No.:

13/157048

Inventors:

David M. JACOBSON - San Diego CA, US
Lu Xiao - San Diego CA, US
David J. Julian - San Diego CA, US
Zhanfeng Jia - Belmont CA, US
Brian M. Buesker - San Diego CA, US
Vito R. Bica - Poway CA, US
Edward H. Teague - San Diego CA, US

Assignee:

QUALCOMM Incorporated - San Diego CA

International Classification:

H04L 9/14

US Classification:

380 44

Abstract:

One feature provides a method for a client node to establish a session key with a group node by obtaining an epoch identity value associated with a current epoch, wherein obtaining the epoch identity value includes one of computing the epoch identity value based on a node real time or negotiating the epoch identity value with the group node, computing a restricted key using a shared secret key, the epoch identity value, and a group node identity associated with the group node, and executing a session key establishment protocol with the group node to derive the session key using the restricted key as a master key in the session key establishment protocol. The session key may be established between the group node and the client node even though communications between the group node and the central node is only intermittently available during the current epoch.

US Patent:

20130073598, Mar 21, 2013

Filed:

Feb 6, 2012

Appl. No.:

13/367322

Inventors:

David M. Jacobson - San Diego CA, US
Xiaochun Zhu - San Diego CA, US
Wenqing Wu - Carlsbad CA, US
Kendrick Hoy Leong Yuen - San Diego CA, US
Seung H. Kang - San Diego CA, US

Assignee:

QUALCOMM Incorporated - San Diego CA

International Classification:

G06F 7/58
G06F 21/00

US Classification:

708252, 708250, 713194

Abstract:

An entropy source and a random number (RN) generator are disclosed. In one aspect, a low-energy entropy source includes a magneto-resistive (MR) element and a sensing circuit. The MR element is applied a static current and has a variable resistance determined based on magnetization of the MR element. The sensing circuit senses the resistance of the MR element and provides random values based on the sensed resistance of the MR element. In another aspect, a RN generator includes an entropy source and a post-processing module. The entropy source includes at least one MR element and provides first random values based on the at least one MR element. The post-processing module receives and processes the first random values (e.g., based on a cryptographic hash function, an error detection code, a stream cipher algorithm, etc.) and provides second random values having improved randomness characteristics.