Also listed on Intellectual Ventures Assets 186 LLC, an earlier holder on the record. The recorded assignments below show how it moved.
Term ends May 18, 2028 · High confidence
20-year base term ended Sep 28, 2026
Filed Sep 28, 2006 as application 11/536,266 · Granted Feb 15, 2011
Base term plus 598 days of patent term adjustment (USPTO delay)
Today
2006
2028
Clock starts
Sep 28, 2006
Sep 28, 2006
Term ends
May 18, 2028
May 18, 2028
Granted
Feb 15, 2011
Feb 15, 2011
base term
patent term adjustment
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
598
Days of term adjustment
Read from the USPTO patent term adjustment record, not recalculated here.
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.
This patent's term runs 598 days past its 20-year base term on 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 Sep 28, 2006, when this application, 11/536,266, was filed | Sep 28, 2026 | High confidence |
| Continuity chain | Every parent in the chain resolved | no change | High confidence |
| Patent term adjustment | +598 days, USPTO patent term adjustment record | May 18, 2028 | 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 | 3 of 3 maintenance fees paid | In force | High confidence |
| Computed term end | The steps above, in order | May 18, 2028 | High confidence |
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 |
|---|---|---|---|
| Sep 28, 2006 Reel 18334, frame 758 | Smith, William L.; Tischer, Steven | BellSouth Intellectual Property Corporation | Assignment of Assignor's Interest |
| Dec 6, 2011 Reel 27329, frame 801 | AT&T Delaware Intellectual Property, Inc. | AT&T Intellectual Property I, L.P. | Assignment of Assignor's Interest |
| Dec 6, 2011 Reel 27330, frame 837 | AT&T Intellectual Property, Inc. | AT&T BLS Intellectual Property, Inc. | Change of Name |
| Dec 6, 2011 Reel 27330, frame 839 | AT&T BLS Intellectual Property, Inc. | AT&T Delaware Intellectual Property, Inc. | Change of Name |
| Dec 6, 2011 Reel 27330, frame 883 | BellSouth Intellectual Property Corporation | AT&T Intellectual Property, Inc. | Change of Name |
| May 21, 2012 Reel 28242, frame 424 | AT&T Intellectual Property I, L.P. | Wantage Technologies LLC | Assignment of Assignor's Interest |
| Feb 12, 2023 Reel 62667, frame 745 | Wantage Technologies LLC | Intellectual Ventures Assets 186 LLC | Assignment of Assignor's Interest |
| Mar 23, 2023 Reel 63155, frame 300 | Mind Fusion, LLC | Intellectual Ventures Assets 186 LLC | Security Interest |
| Jul 13, 2023 Reel 64271, frame 1 | Intellectual Ventures Assets 186 LLC | Mind Fusion, LLC | Assignment of Assignor's Interest |
| Sep 1, 2023 Reel 64803, frame 469 | Mind Fusion, LLC | Crystal Mountain Communications, LLC | Assignment of Assignor's Interest |
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.
What's changing
May 2028
Term ends May 18, 2028. No further fees fall due before then
Note
The 598 days of patent term adjustment (USPTO delay) are read from the USPTO record, not recalculated by us
Citations
49
later US patents cite this one
That is top 25% of utility patents granted in 2011 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.