William Haggerty

US Patent:

20020029288, Mar 7, 2002

Filed:

Jun 15, 2001

Appl. No.:

09/882275

Inventors:

Kurt Dobbins - Bedford NH, US
David Cullerot - Manchester NH, US
Stephen Negus - Windham NH, US
William Haggerty - Dunstable MA, US

International Classification:

G06F015/173
G06F015/16

US Classification:

709/238000, 709/230000

Abstract:

Apparatus and method wherein multiple router interfaces are assigned the same IP network address, creating an IP work group. This enhances host mobility by allowing, in one embodiment, a host to be relocated anywhere in the work group without requiring reconfiguration of the host. As a further option, host address ranges may be specified (i.e., locked) to designated interfaces of the work group, to enhance security by restricting the allowed host mobility within the work group. An additional advantage is a reduced consumption of network and subnet addresses, because now a single address is used for several physical networks.

US Patent:

57519714, May 12, 1998

Filed:

Jul 12, 1995

Appl. No.:

8/501324

Inventors:

Kurt A. Dobbins - Bedford NH
David L. Cullerot - Manchester NH
Stephen H. Negus - Windham NH
William T. Haggerty - Dunstable MA

Assignee:

Cabletron Systems, Inc. - Rochester NH

International Classification:

G06F 1516

US Classification:

39520068

Abstract:

Apparatus and method wherein multiple router interfaces are assigned the same IP network address, creating an IP work group. This enhances host mobility by allowing, in one embodiment, a host to be relocated anywhere in the work group without requiring reconfiguration of the host. As a further option, host address ranges may be specified (i. e. , locked) to designated interfaces of the work group, to enhance security by restricting the allowed host mobility within the work group. An additional advantage is a reduced consumption of network and subnet addresses, because now a single address is used for several physical networks.

US Patent:

46880313, Aug 18, 1987

Filed:

Mar 30, 1984

Appl. No.:

6/595027

Inventors:

William T. Haggerty - Groton MA

Assignee:

Wang Laboratories, Inc. - Lowell MA

International Classification:

G09G 300

US Classification:

340793

Abstract:

A color to monochromatic image transformation which transforms each color area of the original image into a corresponding area of a monochromatic image having a particular pattern of `light` and `dark` dots corresponding to and representing the original color of the area. The dot patterns are selected to provide both gray scale representations of the original colors and differing textural appearances for each color, so as to maximize the discrimination between the areas of the monochromatic image. The monochromatic dot patterns do not necessarily correspond exactly to the colors or gray scale values of the original colors, but are selected to provide visual impressions analogous to the visual impressions provided by the corresponding original colors. A further feature of the dot arrays selected to represent various colors is that the patterns of dots are selected for each array so as to avoid the creation of artifacts, that is, the formation of accidental or incidental patterns and figures within a given array or at the junction or border between two arrays. A yet further feature is the enhancement, during transformation, of the visual appearance of alphanumeric characters and symbols.

US Patent:

62498207, Jun 19, 2001

Filed:

May 6, 1998

Appl. No.:

9/073557

Inventors:

Kurt A. Dobbins - Bedford NH
David L. Cullerot - Manchester NH
Stephen H. Negus - Winhdam NH
William T. Haggerty - Dunstable MA

Assignee:

Cabletron Systems, Inc. - Rochester NH

International Classification:

G06F 15173

US Classification:

709238

Abstract:

Apparatus and method wherein multiple router interfaces are assigned the same IP network address, creating an IP work group. This enhances host mobility by allowing, in one embodiment, a host to be relocated anywhere in the work group without requiring reconfiguration of the host. As a further option, host address ranges may be specified (i. e. , locked) to designated interfaces of the work group, to enhance security by restricting the allowed host mobility within the work group. An additional advantage is a reduced consumption of network and subnet addresses, because now a single address is used for several physical networks.

US Patent:

55091237, Apr 16, 1996

Filed:

Mar 22, 1994

Appl. No.:

8/216541

Inventors:

Kurt Dobbins - Bedford NH
Kris Dobbins - Goffstown NH
Len Cormier - Leominster MA
Kevin Yohe - Nashua NH
William Haggerty - Dunstable MA
Paul Simoneau - Londonderry NH
Rich Soczewinski - Windham NH

Assignee:

Cabletron Systems, Inc. - DE

International Classification:

G06F 1314
H04J 326

US Classification:

39520015

Abstract:

An object-oriented architecture for network layer routing is provided which distributes function and system behavior into autonomous router objects. By distributing these functionalities into each object, the services and data normally external to the object are imbedded or accessible within the object itself. In another sense, some objects are distributed across the network; e. g. , a separate forwarding engine is provided at each network interface. In a preferred embodiment, each object has: (1) common, protocol-independent functions that are shared by all objects of that class; (2) their own configuration information; (3) accessibility through a router resource object for instantiation and control; (4) automatic persistence in NVRAM; (5) remote management capabilities; and (6) text names for navigation of a resource tree as a file system. These capabilities are in every object regardless of the specific protocol or application. This ensures a common architecture among many different systems/router components, a common method of control internally, a consistent order of instantiation and a common functional behavior.

US Patent:

63319837, Dec 18, 2001

Filed:

May 6, 1997

Appl. No.:

8/852188

Inventors:

William T. Haggerty - Dunstable MA
Phillip Andlauer - Londonderry NH
Stephen H. Negus - Windham NH

Assignee:

Enterasys Networks, Inc. - Rochester NH

International Classification:

H04L 1266

US Classification:

370400

Abstract:

Method and apparatus for establishing connections in a switch-based communications network for multicast traffic. A source receives a multicast packet on an access port from a source host, determines a group address in the multicast packet, and composes and sends a "sender present" message to other switches on its network ports. The receiving switches determine whether a local host wishes to join the group and if so, send a map message back toward the source switch on a predetermined path between the receiving switch and the source switch. A map message may terminate at a switch on the path that already has a connection for this group/source pair, and join into this connection as an additional output port. In this manner, a "signal out, connect back" method is provided for establishing a connection path from the sender to multiple receivers. In addition, multicast traffic can be sent across a switch/router interface in either direction, providing for controlled multicast traffic between router-based networks and switch-based networks.

US Patent:

59516496, Sep 14, 1999

Filed:

Mar 8, 1996

Appl. No.:

8/611333

Inventors:

Kurt Dobbins - Bedford NH
Kris Dobbins - Goffstown NH
Len Cormier - Leominster MA
Kevin Yohe - Nashua NH
William Haggerty - Dunstable MA
Paul Simoneau - Londonderry NH
Rich Soczewinski - Windham NH

Assignee:

Cabletron Systems, Inc. - Rochester NH

International Classification:

G06F 1517

US Classification:

709238

Abstract:

An interconnecting apparatus includes one or more interfaces. Each interface connects to a network. The interconnecting apparatus interconnects the networks attached to the interfaces. The device utilizes distributed autonomous forwarding engines on each interface in that each interface has a forwarding engine corresponding to it. Each forwarding engine only knows the configuration information and how to receive and transmit packets on the one interface to which it corresponds. Each forwarding engine acts independently to process packets, yet each interacts together to collectively provide packet forwarding which is protocol independent, interface independent, and scalable.

US Patent:

47033185, Oct 27, 1987

Filed:

Apr 16, 1985

Appl. No.:

6/723732

Inventors:

William T. Haggerty - Groton MA

Assignee:

Wang Laboratories, Inc. - Lowell MA

International Classification:

G09G 100

US Classification:

346723

Abstract:

Forming a character-based monochromatic image from a digital representation of a color image by (1) forming a character-based representation of the color image in which a plurality of color characters each describe the background and foreground color within a defined area of the color image, (2) providing a plurality of color pattern masks each corresponding to a color in the color image and comprised of a pattern of light and dark dots capable of providing, in the monochromatic image, visual discrimination between areas of different color, (3) transforming the color characters to monochromatic characters by replacing the background and foreground color of each color character with the corresponding pattern of light and dark dots, and (4) displaying the monochromatic characters on a character-based output device (e. g. , a CRT display driven by a character-based controller).