Term ends Jan 20, 2036 · High confidence
20-year base term ends Jan 20, 2036
Held by Drum Workshop, Inc.
Filed May 1, 2017 as application 15/583,173 · Granted Dec 11, 2018
Base term, 20 years from filing
Today
2016
2036
Clock starts
Jan 20, 2016
Jan 20, 2016
Term ends
Jan 20, 2036
Jan 20, 2036
Granted
Dec 11, 2018
Dec 11, 2018
base term
fee events
Updated Nov 14, 2026 · includes USPTO assignment & status data published Nov 14, 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 9,640,154, to Jan 20, 2036. 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.
8
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 Jan 20, 2016, when application 15/002,264, the earliest non-provisional in its chain, was filed (this one was filed May 1, 2017) | Jan 20, 2036 | 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 9,640,154) | resolves to Jan 20, 2036, 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 | Jan 20, 2036 | High confidence |
This family
| US 9,589,546 | In force Oct 2034 | Oct 2034 |
| Application PCT/US2014/057383 | PCT application no patent term | no patent term |
| US 9,640,154 | In force Jan 2036 | Jan 2036 |
| US 9,472,174 | In force Sep 2034 | Sep 2034 |
| US 9,928,815 | In force Sep 2034 | Sep 2034 |
| US 10,832,642 | In force Jan 2035 | Jan 2035 |
| US 10,152,955 | this patent Jan 2036 | Jan 2036 |
| US 10,825,430 | In force Sep 2034 | Sep 2034 |
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 1, 2017 Reel 42194, frame 154 | Sikra, Richard A | Drum Workshop, Inc. | Assignment of Assignor's Interest |
| May 2, 2017 Reel 42388, frame 564 | Sikra, Richard A | Drum Workshop, Inc. | Corrective Assignment to Correct the Receiving Party Previously Recorded at Reel: 042194 Frame: 0154. Assignor(S) Hereby Confirms the Assignment. |
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.
Free plan: 3 watched companies. Pro: unlimited.
Alerts on its grants, lapses and transfers.
What's changing
Jan 2036
Term ends Jan 20, 2036. Maintenance fees still fall due before then
Terminal disclaimer
A terminal disclaimer resolved from the filed document, referencing US 9,640,154, ends no earlier than this term, so it caps nothing.
Citations
9
later US patents cite this one
That is above the median of utility patents granted in 2018 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.