Inventor

Charles W. Kaufman

Inventor

Northborough, MA, US

Overview

1989–2020

Patent span

Electricity

Primary field (CPC H)

Patents· 62 as inventor

Public. Assignee & technology derived from the patent record. Each patent links to its LexDana page.

H04Lprimary

H04LTransmission of digital information, e.g. telegraphic communication55%

G06FElectric digital data processing35%

H04NPictorial communication, e.g. television2%

H04QSelecting2%

G07FCoin-freed or like apparatus1%

G09CCiphering or deciphering apparatus for cryptographic or other purposes involving the need for secrecy1%

H04JMultiplex communication1%

H04WWireless communication networks1%

Y10STechnical subjects covered by former uspc cross-reference art collections [xracs] and digests1%

PatentTitleYear

10,860,226Systems and methods of synchronizing configuration information in a clustered storage environment2020 10,764,068Computer system employing challenge/response protocol with detection of non-unique incorrect responses2020 10,756,904Efficient and secure distributed ledger maintenance2020 10,680,813Crypto-erasure resilient to network outage2020 10,394,646Incremental data validation2019 10,298,551Privacy-preserving policy enforcement for messaging2019 10,205,594Crypto-erasure resilient to network outage2019 9,467,473'System and method for compact form exhaustive analysis of security policies'2016 9,253,195'Transformation of sequential access control lists utilizing certificates'2016 9,124,431'Evidence-based dynamic scoring to limit guesses in knowledge-based authentication'2015 8,839,375'Managing distributed operating system physical resources'2014 8,706,635'Use of licensed content without identification thereof'2014 8,555,061'Transparent code'2013 8,468,579'Transformation of sequential access control lists utilizing certificates'2013 8,402,532'Host control of partial trust accessibility'2013 8,291,088'Method and system for providing single sign-on user names for web cookies in a multiple user information directory environment'2012 8,225,390'Licensing protected content to application sets'2012 8,082,442'Securely sharing applications installed by unprivileged users'2011 8,011,008'Application security model'2011 8,006,295'Domain ID service'2011 7,949,880'Secure remote password validation'2011 7,926,105'Using security-related attributes'2011 7,925,752'System for providing single sign-on user names for web cookies in a multiple user information directory environment'2011 7,900,248'Access control negation using negative groups'2011 7,669,058'Secure remote password validation'2010 7,603,712'Protecting a computer that provides a Web service from malware'2009 7,480,718'Method for providing single sign-on user names for Web cookies in a multiple user information directory environment'2009 7,360,082'System and method for downloading security context elements governing execution of downloadable and distributable agents'2008 6,687,825'Data processing system and method for protecting data in a hard drive utilizing a signature device'2004 6,178,508'System for controlling access to encrypted data files by a plurality of users'2001 6,094,721'Method and apparatus for password based authentication in a distributed system'2000 6,061,799'Removable media for password based authentication in a distributed system'2000 6,052,469'Interoperable cryptographic key recovery system with verification by comparison'2000 5,924,122'Method for error recovery spinlock in asymmetrically accessed multiprocessor shared memory'1999 5,815,573'Cryptographic key recovery system'1998 5,796,830'Interoperable cryptographic key recovery system'1998 5,796,740'Router using multiple hop redirect messages to enable bridge like data forwarding'1998 5,787,169'Method and apparatus for controlling access to encrypted data files in a computer system'1998 5,764,772'Differential work factor cryptography method and system'1998 5,666,415'Method and apparatus for cryptographic authentication'1997 5,664,099'Method and apparatus for establishing a protected channel between a user and a computer system'1997 5,574,860'Method of neighbor discovery over a multiaccess nonbroadcast medium'1996 5,500,860'Router using multiple hop redirect messages to enable bridge like data forwarding'1996 5,497,421'Method and apparatus for protecting the confidentiality of passwords in a distributed data processing system'1996 5,491,752'System for increasing the difficulty of password guessing attacks in a distributed authentication scheme employing authentication tokens'1996 5,483,598'Message encryption using a hash function'1996 5,475,763'Method of deriving a per-message signature for a DSS or El Gamal encryption system'1995 5,434,855'Method and apparatus for selective interleaving in a cell-switched network'1995 5,418,854'Method and apparatus for protecting the confidentiality of passwords in a distributed data processing system'1995 5,418,781'Architecture for maintaining the sequence of packet cells transmitted over a multicast, cell-switched network'1995 5,373,559'System for increasing the difficulty of password guessing attacks in a distributed authentication scheme employing authentication tokens'1994 5,351,295'Secure method of neighbor discovery over a multiaccess medium'1994 5,261,002'Method of issuance and revocation of certificates of authenticity used in public key networks and other systems'1993 5,235,644'Probabilistic cryptographic processing method'1993 5,224,163'Method for delegating authorization from one entity to another through the use of session encryption keys'1993 5,220,604'Method for performing group exclusion in hierarchical group structures'1993 5,128,926'Updating link state information in networks'1992 5,086,469'Encryption with selective disclosure of protocol identifiers'1992 5,081,678'Method for utilizing an encrypted key as a key identifier in a data packet in a computer network'1992 5,070,528'Generic encryption technique for communication networks'1991 5,018,137'Transparent load sharing for parallel networks'1991 4,878,219'Method and apparatus for nodes in network to avoid shrinkage of an interframe gap'1989

Career & activity timeline

Assembled from patent assignee/location history and declaration credentials.

1989–1997Patents assigned to DIGITAL EQUIPMENT CORP (17)· patent assignee history

1989–1999Based in Northboro, MA, US· patent location history

1992–2008Based in Northborough, MA, US· patent location history

1998–2012Patents assigned to IBM (14)· patent assignee history

2009–2016Patents assigned to MICROSOFT CORP (13)· patent assignee history

2009–2016Based in Sammamish, WA, US· patent location history

2011–2015Patents assigned to KAUFMAN CHARLES WILLIAM (6)· patent assignee history

2014–2020Based in Redmond, WA, US· patent location history

2019–2020Patents assigned to EMC IP HOLDING CO LLC (7)· patent assignee history

Inventor activity

Assignee and location history derived from the patent record.

Assignees

Assignee	Patents	Span
DIGITAL EQUIPMENT CORP	17	1989–1997
IBM	14	1998–2012
MICROSOFT CORP	13	2009–2016
EMC IP HOLDING CO LLC	7	2019–2020
KAUFMAN CHARLES WILLIAMself	6	2011–2015

Locations

Location	Patents	Span
Northborough, Massachusetts, US	24	1992–2008
Sammamish, Washington, US	18	2009–2016
Northboro, Massachusetts, US	11	1989–1999
Redmond, Washington, US	9	2014–2020