D2S, Inc.

135 patents currently held · Updated Nov 14, 2026

3 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

Dec 2026

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.

4 fees due Nov 14 to 26, 2026 · next Nov 14
2 fees due Dec 11 to 16, 2026 · next Dec 11
2 fees due Jan 4 to 28, 2027 · next Jan 4
1 fee due Feb 11, 2027
The maintenance fee for Method and system for improving critical dimension uniformity using shaped beam lithography (US 9,104,109) comes due Feb 11, 2027. Unpaid by Aug 11, 2027, it lapses early.
1 fee due Mar 12, 2027
The maintenance fee for Method and system for determining a charged particle beam exposure for a local pattern density (US 11,756,765) comes due Mar 12, 2027. Unpaid by Sep 13, 2027, it lapses early.
5 fees due Apr 1 to 29, 2027 · next Apr 1
1 fee due Jul 30, 2027
The maintenance fee for Method and system of reducing charged particle beam write time (US 11,886,166) comes due Jul 30, 2027. Unpaid by Jan 31, 2028, it lapses early.
1 fee due Aug 23, 2027
The maintenance fee for Method for forming circular patterns on a surface (US 9,268,214) comes due Aug 23, 2027. Unpaid by Feb 23, 2028, it lapses early.
2 fees due Sep 1 to 5, 2027 · next Sep 1
4 fees due Oct 5 to 30, 2027 · next Oct 5

Which patents, and when each one lapses · Pro

Recent changes

8 of the patents on this record were granted since Aug 16, 2026
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.

Patent	Title	Status	Expires	Confidence
US 8,615,723	Performing OPC on hardware or software platforms with GPU In force Ends no later than Dec 1, 2026 · From the USPTO record	In force	Ends no later than Dec 1, 2026	From the USPTO record
US 9,280,631	Performing OPC on hardware or software platforms with GPU In force Term ends Dec 1, 2026 · From the USPTO record	In force	Term ends Dec 1, 2026	From the USPTO record
US 7,716,627	Solution-dependent regularization method for quantizing continuous-tone lithography masks In force Term ends Sep 28, 2027 · From the USPTO record	In force	Term ends Sep 28, 2027	From the USPTO record
US 8,141,004	Solution-dependent regularization method for quantizing continuous-tone lithography masks In force Term ends Sep 28, 2027 · From the USPTO record	In force	Term ends Sep 28, 2027	From the USPTO record
US 8,321,819	Lithography mask functional optimization and spatial frequency analysis In force Ends no later than Sep 28, 2027 · From the USPTO record	In force	Ends no later than Sep 28, 2027	From the USPTO record
US 8,689,148	Regularization method for quantizing lithography masks In force Term ends Sep 28, 2027 · From the USPTO record	In force	Term ends Sep 28, 2027	From the USPTO record
US 8,707,222	Lithography mask functional optimization and spatial frequency analysis In force Ends no later than Sep 28, 2027 · From the USPTO record	In force	Ends no later than Sep 28, 2027	From the USPTO record
US 9,268,900	Lithography mask functional optimization and spatial frequency analysis In force Ends no later than Sep 28, 2027 · From the USPTO record	In force	Ends no later than Sep 28, 2027	From the USPTO record
US 9,280,634	Regularization method for quantizing lithography masks In force Term ends Sep 28, 2027 · From the USPTO record	In force	Term ends Sep 28, 2027	From the USPTO record
US 7,546,574	Optical proximity correction on hardware or software platforms with graphical processing units In force Term ends Jan 15, 2028 · From the USPTO record	In force	Term ends Jan 15, 2028	From the USPTO record

10 of 135 patents shown.

Pro members see all 135.

Pro members: see all 135 patents

Also on record, not counted in the 135: 3 patents in force now held by others · 18 lapsed for an unpaid fee. 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.

24 pending · 2 abandoned · 34 no status recorded

List them