Lapsed Jul 5, 2015 on the fee record · High confidence
20-year base term ended Dec 5, 2025
First maintenance fee unpaid; grace period ended.
Held by Memjet Technology Limited
Filed Apr 13, 2009 as application 12/422,908 · Granted Jul 5, 2011
Base term, 20 years from filing, plus 229 days of patent term adjustment (USPTO delay)
Today
Lapsed Jul 5, 2015
2005
2026
Clock starts
Dec 5, 2005
Dec 5, 2005
No longer in force
Jul 5, 2015
Jul 5, 2015
Granted
Jul 5, 2011
Jul 5, 2011
Term would have run to
Jul 22, 2026
Jul 22, 2026
base term
patent term adjustment
after the term ends
Updated Nov 15, 2026 · includes USPTO assignment & status data published Nov 15, 2026 and grant & fee data published Nov 10, 2026 (weekly) · how we know
229
Days of term adjustment
Read from the USPTO patent term adjustment record, not recalculated here.
No effect
Terminal disclaimer
Resolved from the filed document, referencing US 12,422,908, to Jul 22, 2026. The term already ends on or before that date, so the cap shortened nothing.
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.
2
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 Jul 22, 2026: its 20-year base term plus 229 days of term adjustment for prosecution delay. A terminal disclaimer is resolved from the filed document, and it ends no earlier than this term, so it shortens nothing. 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 Dec 5, 2005, when application 11/293,807, the earliest non-provisional in its chain, was filed (this one was filed Apr 13, 2009) | Dec 5, 2025 | High confidence |
| Continuity chain | Every parent in the chain resolved | no change | High confidence |
| Patent term adjustment | +229 days, USPTO patent term adjustment record | Jul 22, 2026 | High confidence |
| Terminal disclaimer cap | Disclaimer resolved from the filed document (refs US 12,422,908) | resolves to Jul 22, 2026, no earlier than this term, so no change | High confidence |
| Patent term extension | None on file | no change | High confidence |
| Fee events | 0 of 3 maintenance fees paid | lapsed Jul 5, 2015 | High confidence |
| Computed term end | The steps above, in order | Jul 5, 2015 | High confidence |
This family
| US 7,524,023 | In force no later than Dec 2026 | no later than Dec 2026 |
| US 7,971,965 | this patent Jul 2015 | Jul 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 |
|---|---|---|---|
| Apr 15, 2009 Reel 22551, frame 102 | Silverbrook, Kia; Berry, Norman Micheal; Nakazawa, Akira; Mackey, Paul Ian; Jackson, Garry Raymond | Silverbrook Research Pty Ltd. | Assignment of Assignor's Interest |
| Jul 10, 2012 Reel 28520, frame 409 | Silverbrook Research Pty. Limited and Clamate Pty Limited | Zamtec Limited | Assignment of Assignor's Interest |
| Jun 25, 2014 Reel 33244, frame 276 | Zamtec Limited | Memjet Technology Limited | Change of Name |
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.
What's changing
Note
The 229 days of patent term adjustment (USPTO delay) are read from the USPTO record, not recalculated by us
Terminal disclaimer
A terminal disclaimer resolved from the filed document, referencing US 12,422,908, ends no earlier than this term, so it caps nothing.
Citations
2
later US patents cite this one
That is below 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.