0 patents currently held
19 more in force are now held by other companies
Held is read from USPTO's recorded assignments; a transfer never recorded there does not appear.
1 more record may belong here and awaits a decision; it is not counted.
This portfolio holds none of the 19 US patents in force on its record. from the record
Of the 19 now held by other companies, 11 name Sigmastar Technology Ltd. as their current owner, and 8 more name another party. Each row says which.
Free plan: 3 watched companies. Pro: unlimited.
Alerts on its grants, lapses and transfers.
0
Ending by 2030
none
Next term end
When these terms end
Held patents by the year their term ends
2026 · 0 end2027 · 02028 · 02029 · 02030 · 0
notable patents
all others
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
Notable: the highest-ranked patents in this portfolio by citations and family size.
Notable patents
Ranked by citations and family size, against patents of the same kind granted the same year. How we rank
None of the currently held patents qualifies as notable.
Formerly held, still cited
Notable
Ends Mar 2033 · High confidence
Renewed at every maintenance window since the 2014 grant; no more fees are due before its term ends in 2033.
now held by Sigmastar Technology Ltd.
Also notable
Ends no later than Nov 2028 · Low confidence
Renewed at every maintenance window since the 2011 grant; no more fees are due before its term ends in 2028. A terminal disclaimer is on file and its reference is not resolved, so no cap is applied and the date may move earlier, never later.
now held by Xueshan Technologies Inc.
Also notable
Ends Apr 2028 · High confidence
Renewed at every maintenance window since the 2012 grant; no more fees are due before its term ends in 2028.
now held by Sigmastar Technology Ltd.
Fee deadlines
No maintenance fee falls due on this company's record before Nov 10, 2027.
Recent changes
Nothing was recorded against this company's patents in the last 90 days.
Patents held now
Soonest term end first.
Also on record: 19 patents in force now held by others · 4 patents ended · 15 applications abandoned. List them
Sources and methods
Compiled from USPTO application file histories, grants and recorded assignments, with the company's own names reviewed by hand. How this record was built
Portfolio grouped automatically from ownership conveyances to the names matched to this company, usually every name that begins with its own, so it counts patents an affiliate holds; each list row names the holder of record. Security interests are excluded and ambiguous records are not reviewed by hand.
Computed patent terms end on the dates shown. Related patents and pending applications may cover overlapping subject matter.
1 terminal disclaimer is on file with no resolved reference. No cap is applied and none is guessed
1 computed term date comes from a chain with an unresolved parent. A continuity parent has not yet been fetched from USPTO's records. The term is dated from this application's own claim; no earlier date is assumed until the parent is resolved.