21CT, Inc.

8 patents currently held · Updated Nov 14, 2026

9 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.

Ending by 2030

Sep 2028

Next term end

When these terms end

5 yrs10 yrs20 yrs

Held patents by the year their term ends

20262027202820292030203120322033203420352036203720382039204020412042204320442045

Fee deadlines

Maintenance fees fall due 3.5, 7.5 and 11.5 years after grant. A missed fee ends a patent at the end of the six month grace period that follows, not on the due date.

1 fee due Sep 1, 2027
The maintenance fee for Method and apparatus for identifying a threatening network (US 9,276,948) comes due Sep 1, 2027. Unpaid by Mar 1, 2028, it lapses early.

Which patents, and when each one lapses · Pro

Recent changes

1 term has ended since Aug 16, 2026

Patents held now

Soonest term end first. Each date below is computed on that patent's own page, which shows the rule, the adjustments and the fee history it was derived from.

Showing 1 to 8 of 8

Patent	Title	Status	Expires	Confidence
US 8,929,645	Method and System for Fast Dense Stereoscopic Ranging In force Term ends Sep 26, 2028 · High confidence	In force	Term ends Sep 26, 2028	High confidence
US 8,467,628	Method and System for Fast Dense Stereoscopic Ranging In force Term ends Apr 27, 2030 · High confidence	In force	Term ends Apr 27, 2030	High confidence
US 8,069,127	Method and System for Solving an Optimization Problem with Dynamic Constraints In force Term ends May 2, 2030 · High confidence	In force	Term ends May 2, 2030	High confidence
US 8,611,591	System and Method for Visually Tracking with Occlusions In force Term ends May 14, 2030 · High confidence	In force	Term ends May 14, 2030	High confidence
US 8,874,616	Method and apparatus for fusion of multi-modal interaction data In force Term ends Jul 11, 2032 · From the USPTO record	In force	Term ends Jul 11, 2032	From the USPTO record
US 9,020,816	Hidden Markov Model for Speech Processing with Training Method In force Term ends Jul 26, 2032 · High confidence	In force	Term ends Jul 26, 2032	High confidence
US 9,578,051	Method and system for identifying a threatening network In force Ends no later than Dec 28, 2032 · From the USPTO record	In force	Ends no later than Dec 28, 2032	From the USPTO record
US 9,276,948	Method and apparatus for identifying a threatening network In force Term ends Jun 25, 2034 · From the USPTO record	In force	Term ends Jun 25, 2034	From the USPTO record

Also on record, not counted in the 8: 9 patents in force now held by others · 2 lapsed for an unpaid fee · 2 ended at full term. List them

Sources and methods

Compiled from the USPTO record, grants, published applications and recorded assignments, not yet reviewed by hand. How this record was built

Computed patent terms end on the dates shown. Related patents and pending applications may cover overlapping subject matter.

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Published applications

US patent applications published under this name that have not become patents. An application is published about eighteen months after its earliest filing; one that has not been published is in no public record.

2 no status recorded

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