Term ends Aug 25, 2034 · High confidence
20-year base term ends Apr 13, 2032
Held by Epizyme, Inc.
Filed Apr 13, 2012 as application 13/447,007 · Granted Apr 2, 2013
Base term, 20 years from filing
Today
2012
2034
Clock starts
Apr 13, 2012
Apr 13, 2012
Term ends
Aug 25, 2034
Aug 25, 2034
Granted
Apr 2, 2013
Apr 2, 2013
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.
None
Terminal disclaimer
No disclaimer on this record.
3 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. All three maintenance fees are recorded paid; no more fees are due. 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 this application, 13/447,007, was filed | 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 | None on record | no cap applied | High confidence |
| Patent term extension | +864 days, USPTO 35 U.S.C. 156 certificate | added to Apr 13, 2032: Aug 25, 2034 | High confidence |
| Fee events | 3 of 3 maintenance fees paid | In force | High confidence |
| Computed term end | The steps above, in order | Aug 25, 2034 | High confidence |
This family
| US 8,410,088 | this patent 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 | In force 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 |
|---|---|---|---|
| May 31, 2012 Reel 28298, frame 796 | Kuntz, Kevin W.; Chesworth, Richard; Duncan, Kenneth W.; Keilhack, Heike; Warholic, Natalie; Klaus, Christine | Epizyme, Inc. | Assignment of Assignor's Interest |
| Jul 11, 2012 Reel 28530, frame 112 | Zheng, Wanjun; Seki, Masashi; Shirotori, Syuji; Kawano, Satoshi | Eisai Co., Ltd. | Assignment of Assignor's Interest |
| Jul 11, 2012 Reel 28530, frame 163 | Eisai Co., Ltd. | Eisai R&D Mangement Co., Ltd. | Assignment of Assignor's Interest |
| Oct 5, 2012 Reel 29083, frame 652 | Knutson, Sarah K. | Epizyme, Inc. | Assignment of Assignor's Interest |
| Mar 11, 2013 Reel 29993, frame 148 | Seki, Masashi; Shirotori, Syuji; Kawano, Satoshi | Eisai Co., Ltd. | Corrective Assignment to Correct Conveying Party Data. Remove Wanjun Zhen from Assignment, Previously Recorded on Reel 028530, Frame 0112. Assignor(S) Hereby Confirms the Assignment of Assignors Interest. |
| Mar 25, 2013 Reel 30078, frame 26 | 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
Aug 2034
Term ends Aug 25, 2034. No further fees fall due before then
Citations
138
later US patents cite this one
That is top 5% of utility patents granted in 2013 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.