Also listed on Packet Design Inc., an earlier holder on the record. The recorded assignments below show how it moved.
Term ends Feb 14, 2029 · High confidence
20-year base term ends Aug 13, 2028
Held by Ciena Corporation
Filed Aug 13, 2008 as application 12/228,641 · Granted Apr 16, 2013
Base term plus 185 days of patent term adjustment (USPTO delay)
Today
2008
2029
Clock starts
Aug 13, 2008
Aug 13, 2008
Term ends
Feb 14, 2029
Feb 14, 2029
Granted
Apr 16, 2013
Apr 16, 2013
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
185
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 185 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 Aug 13, 2008, when this application, 12/228,641, was filed | Aug 13, 2028 | High confidence |
| Continuity chain | Every parent in the chain resolved | no change | High confidence |
| Patent term adjustment | +185 days, USPTO patent term adjustment record | Feb 14, 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 | 3 of 3 maintenance fees paid | In force | High confidence |
| Computed term end | The steps above, in order | Feb 14, 2029 | 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 |
|---|---|---|---|
| Oct 6, 2008 Reel 21659, frame 1 | Alaettinoglu, Cengiz; Ananthakrishnan, Hariharan; Bassias, Constantinos; Kanna, Satish K.; Palasdeokar, Roopesh; Taneja, Siddharth; Yajurvedi, Amit | Packet Design, Inc. | Assignment of Assignor's Interest |
| Mar 26, 2013 Reel 30089, frame 810 | Packet Design, Inc. | PD Acquisition, LLC | Assignment of Assignor's Interest |
| Mar 26, 2013 Reel 30091, frame 880 | PD Acquisition, LLC | Packet Design, LLC | Change of Name |
| Sep 10, 2014 Reel 33713, frame 276 | Packet Design, LLC | Comerica Bank | Security Interest |
| Jul 2, 2018 Reel 46464, frame 226 | Comerica Bank | Packet Design, LLC | Release of Security Interest at Reel 033713 / Frame 0276 |
| Jul 13, 2018 Reel 46342, frame 761 | Packet Design, LLC | Ciena Corporation | Merger |
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
Feb 2029
Term ends Feb 14, 2029. No further fees fall due before then
Note
The 185 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 top 25% 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.
In force means the term is running and no lapse is on record. It is not a finding that the patent is valid.