Lapsed Jun 7, 2015 on the fee record · High confidence
20-year base term ended Aug 1, 2025
First maintenance fee unpaid; grace period ended.
Held by Silverbrook Research Pty Ltd.
Filed Aug 18, 2010 as application 12/859,179 · Granted Jun 7, 2011
Base term, 20 years from filing
Today
Lapsed Jun 7, 2015
2005
2026
Clock starts
Aug 1, 2005
Aug 1, 2005
No longer in force
Jun 7, 2015
Jun 7, 2015
Granted
Jun 7, 2011
Jun 7, 2011
Term would have run to
Aug 1, 2025
Aug 1, 2025
base term
after the term ends
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
None
Term adjustment
No prosecution delay on this record.
None
Terminal disclaimer
No disclaimer on this record.
0 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.
4
Family applications on record here
Applications sharing this one's continuity chain whose file history this site holds. The family may have others.
Its term would have run to Aug 1, 2025: its 20-year base term, with no adjustment for prosecution delay. 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 1, 2005, when application 11/193,435, the earliest non-provisional in its chain, was filed (this one was filed Aug 18, 2010) | Aug 1, 2025 | High confidence |
| Continuity chain | Every parent in the chain resolved | no change | High confidence |
| Patent term adjustment | None on file | no change | 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 | 0 of 3 maintenance fees paid | lapsed Jun 7, 2015 | High confidence |
| Computed term end | The steps above, in order | Jun 7, 2015 | High confidence |
This family
| US 7,567,241 | Lapsed on the fee record Jul 2013 | Jul 2013 |
| US 7,794,167 | In force Jul 2028 | Jul 2028 |
| US 8,308,387 | Lapsed on the fee record Nov 2016 | Nov 2016 |
| US 7,955,017 | this patent Jun 2015 | Jun 2015 |
The applications whose file history this site holds. The family may have others.
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 18, 2010 Reel 24857, frame 45 | Lapstun, Paul; Underwood, Matthew John; King, Tobin Allen; Silverbrook, Kia | Silverbrook Research Pty Ltd. | 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.
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Alerts on its grants, lapses and transfers.
Citations
11
later US patents cite this one
That is above the median 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.