Also listed on Corel TW Corp., an earlier holder on the record. The recorded assignments below show how it moved.
Collateral for a security interest recorded May 1, 2026 (First-Citizens Bank & Trust Company).
Term ends May 17, 2027 · High confidence
20-year base term ended Jul 13, 2025
Held by Corel Corporation
Filed Jul 13, 2005 as application 11/179,548 · Granted Oct 28, 2008
Base term plus 673 days of patent term adjustment (USPTO delay)
Today
2005
2027
Clock starts
Jul 13, 2005
Jul 13, 2005
Term ends
May 17, 2027
May 17, 2027
Granted
Oct 28, 2008
Oct 28, 2008
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
673
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 673 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 Jul 13, 2005, when this application, 11/179,548, was filed | Jul 13, 2025 | High confidence |
| Continuity chain | Every parent in the chain resolved | no change | High confidence |
| Patent term adjustment | +673 days, USPTO patent term adjustment record | May 17, 2027 | 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 (reinstated) | High confidence |
| Computed term end | The steps above, in order | May 17, 2027 | 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 |
|---|---|---|---|
| Jul 13, 2005 Reel 16775, frame 306 | Lin, Tsung-wei | Ulead Systems, Inc. | Assignment of Assignor's Interest |
| Mar 27, 2008 Reel 20710, frame 360 | Ulead Systems, Inc. | Intervideo, Digital Technology Corporation | Merger |
| Mar 28, 2008 Reel 20710, frame 684 | Intervideo, Digital Technology Corporation | Corel TW Corp. | Merger |
| Nov 22, 2010 Reel 25387, frame 45 | Corel TW Corporation | Corel Corporation | Assignment of Assignor's Interest |
| Jun 21, 2013 Reel 30657, frame 487 | Corel Corporation; Corel US Holdings, LLC; Corel Inc.; Winzip International LLC; Winzip Computing LLC; Winzip Computing LP | Wilmington Trust, National Association | Security Agreement |
| Jan 4, 2017 Reel 41246, frame 1 | Wilmington Trust, National Association | Corel Corporation; Corel US Holdings,llc; Vapc (Lux) S.Á.R.L. | Release of Security Interest |
| Jan 4, 2017 reel/frame not recorded | Wilmington Trust, National Association | Corel Corporation | Release of Security Interest |
| Jan 4, 2017 reel/frame not recorded | Wilmington Trust, National Association | Corel US Holdings,llc | Release of Security Interest |
| Jan 4, 2017 reel/frame not recorded | Wilmington Trust, National Association | Vapc (Lux) S.Á.R.L. | Release of Security Interest |
| Jul 3, 2019 Reel 49678, frame 950 | Cascade Bidco Corp.; Corel Inc.; Clearslide Inc. | Citibank, N.a. | Security Interest |
| Jul 3, 2019 Reel 49678, frame 980 | Cascade Bidco Corp.; Corel Inc.; Clearslide Inc. | Cantor Fitzgerald Securities | Security Interest |
| May 1, 2026 Reel 75315, frame 928 | Corel Corporation | First-Citizens Bank & Trust Company | Security Interest |
| May 5, 2026 Reel 75559, frame 953 | Citibank, N.A., as Agent | Corel Corporation; Cascade Bidco Corp.; Corel Inc.; Clearslide Inc. | Release of Security Interest |
| May 5, 2026 reel/frame not recorded | Citibank, N.A., as Agent | Corel Corporation | Release of Security Interest |
| May 5, 2026 reel/frame not recorded | Citibank, N.A., as Agent | Cascade Bidco Corp. | Release of Security Interest |
| May 5, 2026 reel/frame not recorded | Citibank, N.A., as Agent | Corel Inc. | Release of Security Interest |
| May 5, 2026 reel/frame not recorded | Citibank, N.A., as Agent | Clearslide Inc. | Release of Security Interest |
| May 6, 2026 Reel 75522, frame 510 | Cantor Fitzgerald Securities, As Collateral Agent | Clearslide Inc.; Corel Corporation (as Successor in Interest to Cascade Bidco Corp.) | Termination and Release of Second Lien Security Interest in Patent Rights |
| May 6, 2026 reel/frame not recorded | Cantor Fitzgerald Securities, As Collateral Agent | Clearslide Inc. | Termination and Release of Second Lien Security Interest in Patent Rights |
| May 6, 2026 reel/frame not recorded | Cantor Fitzgerald Securities, As Collateral Agent | Corel Corporation (as Successor in Interest to Cascade Bidco Corp.) | Termination and Release of Second Lien Security Interest in Patent Rights |
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 2027
Term ends May 17, 2027. No further fees fall due before then
Note
The 673 days of patent term adjustment (USPTO delay) are read from the USPTO record, not recalculated by us
Citations
24
later US patents cite this one
That is above the median of utility patents granted in 2008 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.