Also listed on CTB McGraw Hill, an earlier holder on the record. The recorded assignments below show how it moved.
Term ends Jul 2, 2030 · High confidence
20-year base term ended May 26, 2026
Held by Data Recognition Corporation
Filed May 26, 2006 as application 11/441,450 · Granted May 1, 2012
Base term plus 1498 days of patent term adjustment (USPTO delay)
Today
2006
2030
Clock starts
May 26, 2006
May 26, 2006
Term ends
Jul 2, 2030
Jul 2, 2030
Granted
May 1, 2012
May 1, 2012
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
1,498
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 1498 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 May 26, 2006, when this application, 11/441,450, was filed | May 26, 2026 | High confidence |
| Continuity chain | Every parent in the chain resolved | no change | High confidence |
| Patent term adjustment | +1498 days, USPTO patent term adjustment record | Jul 2, 2030 | 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 | Jul 2, 2030 | 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 |
|---|---|---|---|
| Aug 23, 2006 Reel 18161, frame 228 | Tidwell-scheuring, Sylvia; Creamer, Roger P.; Zebrowski, Molly; Poor, David D.s. | CTB McGraw-Hill | Assignment of Assignor's Interest |
| Mar 26, 2013 Reel 30088, frame 771 | McGraw-Hill School Education Holdings, LLC | Bank of Montreal | Security Agreement |
| Jan 16, 2014 Reel 32040, frame 330 | McGraw-Hill School Education Holdings, LLC; CTB/McGraw-Hill, LLC; Grow.net, Inc. | Bank Of Montreal, As Collateral Agent | Security Agreement |
| Jul 2, 2014 Reel 33232, frame 307 | CTB/McGraw-Hill LLC | McGraw-Hill School Education Holdings LLC | Assignment of Assignor's Interest |
| Oct 8, 2015 Reel 36755, frame 610 | McGraw-Hill School Education Holdings LLC | CTB/McGraw-Hill LLC | Assignment of Assignor's Interest |
| Oct 9, 2015 Reel 36762, frame 940 | CTB/McGraw-Hill LLC | Data Recognition Corporation | Assignment of Assignor's Interest |
| Oct 28, 2015 Reel 36902, frame 612 | Data Recognition Corporation | McGraw-Hill School Education Holdings LLC | License |
| Nov 17, 2015 Reel 37134, frame 211 | Data Recognition Corporation | McGraw-Hill School Education Holdings LLC | Corrective Assignment to Correct the Exhibit a of the License Agreement (Patent Number 70561244 Should Be Patent Number 7056124) Previously Recorded at Reel: 036902 Frame: 0612. Assignor(S) Hereby Confirms the Assignment. |
| Jun 29, 2016 Reel 39205, frame 841 | McGraw-Hill School Education Holdings, LLC | Credit Suisse AG, Cayman Islands Branch | Patent Security Agreement |
| Jun 29, 2016 Reel 39205, frame 871 | Bank of Montreal | McGraw-Hill School Education Holdings, LLC | Release of Patent Security Agreement |
| Jun 29, 2016 Reel 39206, frame 35 | Bank of Montreal | McGraw-Hill School Education Holdings, LLC; CTB/McGraw-Hill LLC; Grow.net, Inc. | Release of Patent Security Agreement |
| Jun 29, 2016 reel/frame not recorded | Bank of Montreal | CTB/McGraw-Hill LLC | Release of Patent Security Agreement |
| Jun 29, 2016 reel/frame not recorded | Bank of Montreal | Grow.net, Inc. | Release of Patent Security Agreement |
| Aug 23, 2021 Reel 57263, frame 646 | Credit Suisse AG, Cayman Islands Branch, as Agent | McGraw Hill LLC (as Successor to McGraw-Hill School Education Holdings, LLC) | Release of Patent Security Agreement (First Lien) |
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
Jul 2030
Term ends Jul 2, 2030. No further fees fall due before then
Note
The 1498 days of patent term adjustment (USPTO delay) are read from the USPTO record, not recalculated by us
Citations
19
later US patents cite this one
That is above the median of utility patents granted in 2012 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.