Lapsed Mar 19, 2025 on the fee record · High confidence
20-year base term ends Jul 22, 2028
Third maintenance fee unpaid; grace period ended.
Held by Twitter, Inc.
Filed Jul 22, 2008 as application 12/177,589 · Granted Mar 19, 2013
Base term, 20 years from filing, plus 346 days of patent term adjustment (USPTO delay)
Today
Lapsed Mar 19, 2025
2008
2029
Clock starts
Jul 22, 2008
Jul 22, 2008
No longer in force
Mar 19, 2025
Mar 19, 2025
Granted
Mar 19, 2013
Mar 19, 2013
Term would have run to
Jul 3, 2029
Jul 3, 2029
base term
patent term adjustment
after the term ends
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
346
Days of term adjustment
Read from the USPTO patent term adjustment record, not recalculated here.
None
Terminal disclaimer
No disclaimer on this record.
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.
27
Family applications on record here
Applications sharing this one's continuity chain whose file history this site holds. The family may have others.
Its term would have run to Jul 3, 2029: its 20-year base term plus 346 days of term adjustment for prosecution delay. 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 Jul 22, 2008, when this application, 12/177,589, was filed | Jul 22, 2028 | High confidence |
| Continuity chain | Every parent in the chain resolved | no change | High confidence |
| Patent term adjustment | +346 days, USPTO patent term adjustment record | Jul 3, 2029 | 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 | 2 of 3 maintenance fees paid | lapsed Mar 19, 2025 | High confidence |
| Computed term end | The steps above, in order | Mar 19, 2025 | High confidence |
This family
| US 8,401,009 | this patent Mar 2025 | Mar 2025 |
| US 8,448,084 | Lapsed on the fee record May 2025 | May 2025 |
| US 10,691,513 | Lapsed on the fee record Jun 2024 | Jun 2024 |
| US 10,133,439 | In force Mar 2033 | Mar 2033 |
| US 9,088,532 | In force Aug 2028 | Aug 2028 |
| US 9,405,453 | Lapsed on the fee record Aug 2024 | Aug 2024 |
| US 10,572,102 | Lapsed on the fee record Feb 2024 | Feb 2024 |
| US 9,965,136 | Lapsed on the fee record May 2026 | May 2026 |
8 of 27 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 |
|---|---|---|---|
| Oct 28, 2008 Reel 21747, frame 453 | Dorsey, Jack; Stone, Christopher Isaac | Twitter, Inc. | Assignment of Assignor's Interest |
| Oct 28, 2022 Reel 62079, frame 677 | Twitter, Inc. | Morgan Stanley Senior Funding, Inc. | Security Interest |
| Mar 27, 2025 Reel 70670, frame 857 | Morgan Stanley Senior Funding, Inc. | X Corp. (F/K/A Twitter, Inc.) | Release of Security Interest |
| Apr 30, 2025 Reel 71127, frame 240 | Morgan Stanley Senior Funding, Inc., as Collateral Agent | X Corp. (F/K/A Twitter, Inc.) | Release of Security Interest |
| Mar 3, 2026 Reel 75015, frame 574 | Morgan Stanley Senior Funding, Inc., as Collateral Agent | X Corp. (F/K/A Twitter, Inc.) | Termination and Release of Security Interest in Patent Rights (REEL 062079, Frame 0677) |
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
Note
The 346 days of patent term adjustment (USPTO delay) are read from the USPTO record, not recalculated by us
Citations
79
later US patents cite this one
That is top 10% 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.