Term ends Mar 20, 2039 · High confidence
20-year base term ends May 11, 2038
Held by Slack Technologies, LLC.
Filed May 11, 2018 as application 15/978,013 · Granted Feb 23, 2021
Base term plus 313 days of patent term adjustment (USPTO delay)
Today
2018
2039
Clock starts
May 11, 2018
May 11, 2018
Term ends
Mar 20, 2039
Mar 20, 2039
Granted
Feb 23, 2021
Feb 23, 2021
base term
patent term adjustment
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
313
Days of term adjustment
Read from the USPTO patent term adjustment record, not recalculated here.
None
Terminal disclaimer
No disclaimer on this record.
1 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.
3
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 runs 313 days past its 20-year base term on prosecution delay. 1 of 3 maintenance fees is 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 May 11, 2018, when this application, 15/978,013, was filed | May 11, 2038 | High confidence |
| Continuity chain | Every parent in the chain resolved | no change | High confidence |
| Patent term adjustment | +313 days, USPTO patent term adjustment record | Mar 20, 2039 | High confidence |
| Terminal disclaimer cap | None on record | no cap applied | High confidence |
| Patent term extension | None on file | no change | High confidence |
| Fee events | 1 of 3 maintenance fees paid | In force | High confidence |
| Computed term end | The steps above, in order | Mar 20, 2039 | High confidence |
This family
| US 10,929,155 | this patent Mar 2039 | Mar 2039 |
| Application PCT/US2019/031247 | PCT application no patent term | no patent term |
| US 11,216,289 | In force May 2038 | May 2038 |
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 |
|---|---|---|---|
| Dec 12, 2018 Reel 47751, frame 663 | Gurtin, Liza; Hahn, Michael; Kalalang, Maria-ivmer Real; Harrigan, Elizabeth Catherine; Mountz, Jammie; Chen, Tianxuan | Slack Technologies, Inc. | Assignment of Assignor's Interest |
| May 30, 2019 Reel 49332, frame 349 | Slack Technologies, Inc. | Morgan Stanley Senior Funding, Inc., as Collateral Agent | Patent Security Agreement |
| Jul 19, 2021 Reel 57649, frame 882 | Morgan Stanley Senior Funding, Inc. | Slack Technologies, Inc. | Release of Security Interest in Patent Collateral at Reel/Frame No. 49332/0349 |
| Aug 2, 2021 Reel 57254, frame 693 | Slack Technologies, Inc.; Skyline Strategies I Inc. | Slack Technologies, Inc. | Merger |
| Aug 2, 2021 Reel 57254, frame 738 | Skyline Strategies II LLC; Slack Technologies, Inc.; Slack Technologies, LLC | Slack Technologies, LLC. | Merger and Change of Name |
| Sep 9, 2021 Reel 57514, frame 930 | Skyline Strategies II LLC; Slack Technologies, Inc. | Slack Technologies, LLC | Corrective Assignment to Correct the Newly Merged Entity's New Name, and to Remove the Period Previously Recorded at Reel: 057254 Frame: 0738. Assignor(S) Hereby Confirms the Merger and Change of Name. |
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
Mar 2039
Term ends Mar 20, 2039. Maintenance fees still fall due before then
Note
The 313 days of patent term adjustment (USPTO delay) are read from the USPTO record, not recalculated by us
Citations
3
later US patents cite this one
That is above the median of utility patents granted in 2021 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.