Term ends Apr 13, 2032 · High confidence
20-year base term ends Apr 13, 2032
Held by Epizyme, Inc.
Filed Jun 17, 2015 as application 14/742,481 · Granted Jan 24, 2017
Base term, 20 years from filing
Today
2012
2032
Clock starts
Apr 13, 2012
Apr 13, 2012
Term ends
Apr 13, 2032
Apr 13, 2032
Granted
Jan 24, 2017
Jan 24, 2017
base term
fee events
Updated Nov 15, 2026 · includes USPTO assignment & status data published Nov 15, 2026 and grant & fee data published Nov 10, 2026 (weekly) · how we know
None
Term adjustment
No prosecution delay on this record.
No effect
Terminal disclaimer
Resolved from the filed document, referencing US 8,410,088, US 8,765,732, US 9,090,562, US 9,522,152, to Apr 13, 2032. The term already ends on or before that date, so the cap shortened nothing.
2 of 3
Maintenance fees paid
Three maintenance fees fall due, at 3.5, 7.5 and 11.5 years from grant. This counts the ones the record shows paid.
15
Family applications on record here
Applications sharing this one's continuity chain whose file history this site holds. The family may have others.
This patent's term is its 20-year base term, with no adjustment for prosecution delay. A terminal disclaimer is resolved from the filed document, and it ends no earlier than this term, so it shortens nothing. 2 of 3 maintenance fees are paid so far. Confidence: High. from the record
How we calculated this date
One row per rule, each showing its own input and what it did to the date. A step we could not verify says so instead of resolving itself.
| Step | Input | Date after this step | Confidence |
|---|---|---|---|
| Base term, 20 years from filing | Clock starts Apr 13, 2012, when application 13/447,007, the earliest non-provisional in its chain, was filed (this one was filed Jun 17, 2015) | Apr 13, 2032 | High confidence |
| Continuity chain | Every parent in the chain resolved | no change | High confidence |
| Patent term adjustment | None on file | no change | High confidence |
| Terminal disclaimer cap | Disclaimer resolved from the filed document (refs US 8,410,088, US 8,765,732, US 9,090,562, US 9,522,152) | resolves to Apr 13, 2032, no earlier than this term, so no change | High confidence |
| Patent term extension | None on file | no change | High confidence |
| Fee events | 2 of 3 maintenance fees paid | In force | High confidence |
| Computed term end | The steps above, in order | Apr 13, 2032 | High confidence |
This family
| US 8,410,088 | In force Aug 2034 | Aug 2034 |
| US 8,765,732 | In force Apr 2032 | Apr 2032 |
| US 9,090,562 | In force Apr 2032 | Apr 2032 |
| US 9,549,931 | this patent Apr 2032 | Apr 2032 |
| US 9,522,152 | In force Apr 2032 | Apr 2032 |
| US 10,155,002 | In force Apr 2032 | Apr 2032 |
| US 9,855,275 | In force Apr 2032 | Apr 2032 |
| US 10,420,775 | In force Apr 2032 | Apr 2032 |
8 of 15 applications in this family shown, earliest filings first. The applications whose file history this site holds. The family may have others.
Assignments
Assignment documents as recorded at the USPTO, oldest first, with the reel and frame each was recorded at. A recorded assignment is a filed document, not a statement of current ownership, and the absence of a later one is not evidence that the last one still stands.
| Recorded | Assignor | Assignee | Conveyance |
|---|---|---|---|
| Jun 24, 2015 Reel 35898, frame 679 | Seki, Masashi; Shirotori, Syuji; Kawano, Satoshi | Eisai R&D Management Co., Ltd. | Assignment of Assignor's Interest |
| Jun 24, 2015 Reel 35964, frame 124 | Kuntz, Kevin Wayne; Chesworth, Richard; Duncan, Kenneth William; Keilhack, Heike; Warholic, Natalie; Klaus, Christine; Knutson, Sarah Kathleen; Wigle, Timothy James Nelson | Epizyme, Inc. | Assignment of Assignor's Interest |
| Jul 9, 2015 Reel 36041, frame 621 | Eisai R&D Management Co., Ltd. | Epizyme, Inc. | Assignment of Assignor's Interest |
| Oct 23, 2019 Reel 50806, frame 185 | Seki, Masashi; Shirotori, Syuji; Kawano, Satoshi | Eisai Co., Ltd. | Assignment of Assignor's Interest |
| Oct 23, 2019 Reel 50806, frame 192 | Eisai Co., Ltd. | Eisai R&D Management Co., Ltd. | Assignment of Assignor's Interest |
| Oct 23, 2019 Reel 50806, frame 211 | Eisai R&D Management Co., Ltd. | Epizyme, Inc. | Assignment of Assignor's Interest |
| Nov 19, 2019 Reel 51057, frame 848 | Epizyme, Inc. | Biopharma Credit PLC | Security Interest |
| Aug 13, 2022 Reel 61165, frame 501 | Biopharma Credit PLC | Epizyme, Inc. | Termination and Release of Security Interest in Patents at Reel/Frame: 051057/0848 |
Sources
Google Patents · The patent document at USPTO · Assignment records at USPTO
USPTO account required: This application in Patent Center · USPTO's maintenance fee lookup
Maintenance fee events come from USPTO's own fee records. Its fee lookup asks for the patent number and the application number.
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Alerts on its grants, lapses and transfers.
What's changing
Apr 2032
Term ends Apr 13, 2032. Maintenance fees still fall due before then
Terminal disclaimer
A terminal disclaimer resolved from the filed document, referencing US 8,410,088, US 8,765,732, US 9,090,562, US 9,522,152, ends no earlier than this term, so it caps nothing.
Citations
51
later US patents cite this one
That is top 10% of utility patents granted in 2017 in our data, the only group it is compared against.
How we rank
Every date shows its work: the base term, any term adjustment or extension, any disclaimer cap, and the maintenance fee record, each with a confidence tier. How this record was built
Computed patent terms end on the dates shown. Related patents and pending applications may cover overlapping subject matter.
In force means the term is running and no lapse is on record. It is not a finding that the patent is valid.