Assignment of Assignor's Interest

Recorded: 2015-03-20 Pages: 3

Assignors

CHARI, RAVI V.J.

Executed: 2007-05-29

WIDDISON, WAYNE C.

Executed: 2007-05-29

Assignee

IMMUNOGEN, INC.

830 WINTER STREET, WALTHAM, MASSACHUSETTS, 02451

Covered Properties (5)

Cytotoxic Agents Comprising New Maytansinoids

Patent: 7,851,432 →

Application: 11/778,437 →

Publication: US 2007/0264266

Cytotoxic Agents Comprising New Maytansinoids

Patent: 8,435,528 →

Application: 11/778,451 →

Publication: US 2007/0269447

Cytotoxic Agents Comprising New Maytansinoids

Patent: 7,473,796 →

Application: 11/778,464 →

Publication: US 2007/0270585

Cytotoxic Agents Comprising New Maytansinoids

Patent: 8,841,425 →

Application: 13/043,879 →

Publication: US 2011/0158991

Cytotoxic Agents Comprising New Maytansinoids (DM4)

Application: 14/459,582 →

Publication: US 2015/0071949

Related Assignments (3)

Other recorded transfers of the patents in this record — the chain of ownership.