Lapsed Aug 30, 2023 on the fee record · High confidence
20-year base term ended Dec 5, 2025
Third maintenance fee unpaid; grace period ended.
Held by Memjet Technology Limited
Filed Aug 27, 2008 as application 12/199,687 · Granted Aug 30, 2011
Base term, 20 years from filing, plus 541 days of patent term adjustment (USPTO delay)
Today
Lapsed Aug 30, 2023
2005
2027
Clock starts
Dec 5, 2005
Dec 5, 2005
No longer in force
Aug 30, 2023
Aug 30, 2023
Granted
Aug 30, 2011
Aug 30, 2011
Term would have run to
May 30, 2027
May 30, 2027
base term
patent term adjustment
after the term ends
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
541
Days of term adjustment
Read from the USPTO patent term adjustment record, not recalculated here.
None
Terminal disclaimer
No disclaimer on this record.
2 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 May 30, 2027: its 20-year base term plus 541 days of term 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 Dec 5, 2005, when application 11/293,810, the earliest non-provisional in its chain, was filed (this one was filed Aug 27, 2008) | Dec 5, 2025 | High confidence |
| Continuity chain | Every parent in the chain resolved | no change | High confidence |
| Patent term adjustment | +541 days, USPTO patent term adjustment record | May 30, 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 | 2 of 3 maintenance fees paid | lapsed Aug 30, 2023 | High confidence |
| Computed term end | The steps above, in order | Aug 30, 2023 | High confidence |
This family
| US 7,465,045 | In force Jan 2027 | Jan 2027 |
| US 8,007,089 | this patent Aug 2023 | Aug 2023 |
| US 8,109,621 | In force Jan 2027 | Jan 2027 |
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 27, 2008 Reel 21452, frame 455 | Silverbrook, Kia; Berry, Norman Micheal; Nakazawa, Akira; Mackey, Paul Ian; Jackson, Garry Raymond | Silverbrook Research Pty Ltd. | Assignment of Assignor's Interest |
| Jul 9, 2012 Reel 28516, frame 159 | 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.
Free plan: 3 watched companies. Pro: unlimited.
Alerts on its grants, lapses and transfers.
What's changing
Note
The 541 days of patent term adjustment (USPTO delay) are read from the USPTO record, not recalculated by us
Citations
4
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.