Also listed on Internet Security Systems, Inc., an earlier holder on the record. The recorded assignments below show how it moved.
Collateral for a security interest recorded Dec 12, 2024 (Wilmington Trust, National Association).
Term ends Aug 31, 2027 · High confidence
20-year base term ended Jun 10, 2025
Held by Dropbox, Inc.
Filed Jun 10, 2005 as application 11/150,379 · Granted Jun 23, 2009
Base term plus 812 days of patent term adjustment (USPTO delay)
Today
2005
2027
Clock starts
Jun 10, 2005
Jun 10, 2005
Term ends
Aug 31, 2027
Aug 31, 2027
Granted
Jun 23, 2009
Jun 23, 2009
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
812
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 812 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 Jun 10, 2005, when this application, 11/150,379, was filed | Jun 10, 2025 | High confidence |
| Continuity chain | Every parent in the chain resolved | no change | High confidence |
| Patent term adjustment | +812 days, USPTO patent term adjustment record | Aug 31, 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 | Aug 31, 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 |
|---|---|---|---|
| Jun 10, 2005 Reel 16695, frame 153 | Werner, Carsten; Usher, Mark | Internet Security Systems, Inc. | Assignment of Assignor's Interest |
| Oct 4, 2007 Reel 19920, frame 128 | Internet Security Systems, Inc. | International Business Machines Corporation | Assignment of Assignor's Interest |
| Apr 14, 2017 Reel 42254, frame 1 | Dropbox, Inc. | JPMorgan Chase Bank, N.A., as Collateral Agent | Security Interest |
| Sep 25, 2017 Reel 43938, frame 489 | International Business Machines Corporation | Dropbox, Inc. | Assignment of Assignor's Interest |
| Mar 10, 2021 Reel 55670, frame 219 | Dropbox, Inc. | JPMorgan Chase Bank, N.A., as Collateral Agent | Patent Security Agreement |
| Dec 12, 2024 Reel 69604, frame 611 | Dropbox, Inc. | Wilmington Trust, National Association, as Collateral Agent | Security Interest |
| Dec 12, 2024 Reel 69613, frame 744 | JPMorgan Chase Bank, N.A., as Collateral Agent | Dropbox, Inc. | Release of Security Interest |
| Dec 13, 2024 Reel 69635, frame 332 | JPMorgan Chase Bank, N.A., as Collateral Agent | Dropbox, Inc. | Release of Security Interest |
| Jun 5, 2026 Reel 76607, frame 1 | Dropbox, Inc. | Jpmorgan Chase Bank, N.a. | Security 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.
Free plan: 3 watched companies. Pro: unlimited.
Alerts on its grants, lapses and transfers.
What's changing
Aug 2027
Term ends Aug 31, 2027. No further fees fall due before then
Note
The 812 days of patent term adjustment (USPTO delay) are read from the USPTO record, not recalculated by us
Citations
34
later US patents cite this one
That is top 25% of utility patents granted in 2009 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.