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IPR Details
The Public Patent Foundation's Statement about possible IPR claimed in RFC 2462 and RFC 2464 belonging to Microsoft Corporation

The text of the original IPR disclosure is available in the disclosure history.

Submitted: October 24, 2005 under the rules in RFC 3979.

Note: Updates to IPR disclosures must only be made by authorized representatives of the original submitters. Updates will automatically be forwarded to the current Patent Holder's Contact and to the Submitter of the original IPR disclosure.

I. Possible Patent Holder/Applicant ("Patent Holder")

Holder legal name Microsoft Corporation

II. IETF Document or Other Contribution to Which this IPR Disclosure Relates

RFC2464 ("Transmission of IPv6 Packets over Ethernet Networks")
RFC2462 ("IPv6 Stateless Address Autoconfiguration")

III. Disclosure of Patent Information
i.e., patents or patent applications required to be disclosed by RFC 3979

A. For granted patents or published pending patent applications, please provide the following information:

Patent, Serial, Publication, Registration, or Application/File number(s)

U.S. Patent No. 6,101,499

B. Does this disclosure relate to an unpublished pending patent application?:

Has patent pending Yes

IV. Contact Information of Submitter of this Form

Submitter name Daniel Ravicher
Submitter email

V. Other Notes

Additional notes

Dear IETF:

Pursuant to IETF RFC 3979 Section 6.1.3, the Public Patent Foundation
("PUBPAT") hereby notifies IETF of the existence of intellectual
property rights that may relate to technology described in IETF
documents. Specifically, U.S. Patent No. 6,101,499 ("the '499 patent")
owned by Microsoft Corporation may relate to RFC 2462 - IPv6 Stateless
Address Autoconfiguration and RFC 2464 - Transmission of IPv6 Packets
over Ethernet Networks (collectively referred to as "IPv6").

Although IETF was previously notified of the '499 patent with respect to
IPv4 related documents (see and, the
'499 patent's claims, including for example claims 1 and 30, could
possibly be read as also relating to IPv6. However, other than
identifying this potential relationship, PUBPAT takes no position
regarding the validity or scope of the '499 patent.

If we can provide any further information or be of any other assistance
to IETF in its review of this matter, please do not hesitate to contact me.

Daniel B. Ravicher
Executive Director
Public Patent Foundation
1375 Broadway, Suite 600
New York, NY 10018
(212) 796-0571 direct
(212) 796-0570 main
(212) 591-6038 fax

Only those sections of the relevant entry form where the submitter provided information are displayed above.