Lapsed Jan 29, 2021 on the fee record · High confidence
20-year base term ended Dec 5, 2025
Second maintenance fee unpaid; grace period ended.
Held by Memjet Technology Limited
Filed Jun 17, 2010 as application 12/817,178 · Granted Jan 29, 2013
Base term, 20 years from filing, plus 407 days of patent term adjustment (USPTO delay) · capped by a resolved terminal disclaimer
Today
Lapsed Jan 29, 2021
2005
2026
Clock starts
Dec 5, 2005
Dec 5, 2005
No longer in force
Jan 29, 2021
Jan 29, 2021
Granted
Jan 29, 2013
Jan 29, 2013
Term would have run to
Apr 11, 2026
Apr 11, 2026
base term
patent term adjustment
after the term ends
fee events
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
407
Days of term adjustment
Read from the USPTO patent term adjustment record, not recalculated here.
Capped
Terminal disclaimer
Resolved from the filed document, referencing US 7,771,008.
1 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.
3
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 Apr 11, 2026: its 20-year base term plus 407 days of term adjustment for prosecution delay. A terminal disclaimer resolved from the filed document caps it earlier. 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 11/293,793, the earliest non-provisional in its chain, was filed (this one was filed Jun 17, 2010) | Dec 5, 2025 | High confidence |
| Continuity chain | Every parent in the chain resolved | no change | High confidence |
| Patent term adjustment | +407 days, USPTO patent term adjustment record | Jan 16, 2027 | High confidence |
| Terminal disclaimer cap | Disclaimer resolved from the filed document (refs US 7,771,008) | capped to Apr 11, 2026 | High confidence |
| Patent term extension | None on file | no change | High confidence |
| Fee events | 1 of 3 maintenance fees paid | lapsed Jan 29, 2021 | High confidence |
| Computed term end | The steps above, in order | Jan 29, 2021 | High confidence |
This family
| US 7,431,440 | In force no later than Dec 2026 | no later than Dec 2026 |
| US 7,771,008 | Lapsed on the fee record Aug 2022 | Aug 2022 |
| US 8,360,548 | this patent Jan 2021 | Jan 2021 |
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 |
|---|---|---|---|
| Jun 17, 2010 Reel 24548, frame 230 | Silverbrook, Kia; Berry, Norman Micheal; Nakazawa, Akira; Mackey, Paul Ian; Jackson, Garry Raymond | Silverbrook Research Pty Ltd. | Assignment of Assignor's Interest |
| Jul 11, 2012 Reel 28528, frame 174 | 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 407 days of patent term adjustment (USPTO delay) are read from the USPTO record, not recalculated by us
Disclaimer cap
This term is capped by a terminal disclaimer resolved from the filed document, referencing US 7,771,008.
Citations
0
later US patents cite this one
That is below the median 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.