938 patents currently held

66 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.

The next term ends in Jul 2027. from the record

Free plan: 3 watched companies. Pro: unlimited.

Alerts on its grants, lapses and transfers.

Ending by 2030

Jul 2027

Next term end

927

Patent families

When these terms end

5 yrs10 yrs20 yrs

Held patents by the year their term ends

20262027 2028 2029 2030 2031 2032 2033 2034 2035 2036 2037 2038 2039 2040 2041 2042 2043 2044 2045

notable patents fee due within 90 days 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. Fee due within 90 days: a maintenance fee is due within 90 days of when this page was computed and not yet paid.

Notable patents

Ranked by citations and family size, against patents of the same kind granted the same year. How we rank

Notable

Optical Waveguide Device and Module US 9,020,307

Cited by 37 later US patents, top 25% of utility patents granted in 2015 in our data, and renewed at 3 of 3 maintenance windows. Protection runs to 2031.

Ends May 2031 · High confidence Also notable

Multicore Optical Fiber and Design Method US 11,762,144

Cited by 4 later US patents, top 25% of utility patents granted in 2023 in our data. Protection runs to 2040.

Ends Jun 2040 · High confidence Also notable

Waveguide Path Coupling-Type Photodiode US 8,467,637

Cited by 54 later US patents, top 25% of utility patents granted in 2013 in our data, and renewed at 3 of 3 maintenance windows. Protection runs to 2029.

Ends Jun 2029 · High confidence

Formerly held, still cited

Notable

Auto-Remediation Workflow for Computer Security Testing Utilizing Pre-Existing Security Controls US 11,042,645

Cited by 77 later US patents, top 5% of utility patents granted in 2021 in our data. Protection runs to 2035. A terminal disclaimer caps this term to an earlier patent's.

now held by Black Duck Software, Inc.

Ends Mar 2035 · High confidence

Also notable

Techniques for Correlating Vulnerabilities Across an Evolving Codebase US 9,405,915

Cited by 33 later US patents, top 25% of utility patents granted in 2016 in our data, and renewed at every maintenance window due so far. Protection runs to 2033.

now held by Black Duck Software, Inc.

Ends May 2033 · High confidence

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 Nov 19, 2026
The maintenance fee for Optical Component (US 9,036,958) comes due Nov 19, 2026. Unpaid by May 19, 2027, it lapses early.
1 fee due Dec 4, 2026
The maintenance fee for Optical Waveguide Device (US 10,310,159) comes due Dec 4, 2026. Unpaid by Jun 4, 2027, it lapses early.
1 fee due Jan 25, 2027
The maintenance fee for Image Evaluation Device, Image Evaluation Method, And Image Evaluation Program (US 11,710,226) comes due Jan 25, 2027. Unpaid by Jul 26, 2027, it lapses early.
5 fees due Feb 6 to 25, 2027 · next Feb 6
3 fees due Mar 17 to 24, 2027 · next Mar 17
4 fees due Jun 1 to 30, 2027 · next Jun 1
2 fees due Sep 29 to 30, 2027 · next Sep 29
2 fees due Oct 28 to 30, 2027 · next Oct 28
2 fees due Nov 12, 2027

Which patents, and when each one lapses · Pro

Recent changes

Oct 19Assignment recorded on 1 record: Nippon Telegraph and Telephone Corporation to NTT, Inc. Recorded Oct 19, 2026, executed Jul 1, 2025. Conveyance as recorded: Change of Name. A recorded assignment is a filed document, not a statement of current ownership. Reel 76710, frame 982.
Oct 16Assignment recorded on 1 record: Nippon Telegraph and Telephone Corporation to NTT, Inc. Recorded Oct 16, 2026, executed Jul 1, 2025. Conveyance as recorded: Change of Name. A recorded assignment is a filed document, not a statement of current ownership. Reel 76691, frame 456.
189 of the patents on this record were granted since Aug 16, 2026
3 terms have ended since Aug 16, 2026

What they patent

The 5 largest of its 927 families, grouped by real patent family and labeled by the earliest filing in each. No technology classification is inferred from titles.

Estimation Method, Estimation Apparatus and Estimation Program of Cause of Line of Vehicles	4 in force	to Jul 2042
Optical Waveguide Device and Module	3 in force	to May 2031
Arithmetic Circuit	2 in force	to Jun 2041
Multicore Optical Fiber and Design Method	2 in force	to Jun 2040
Dialogue Processing Apparatus, Learning Apparatus, Dialogue Processing Method, Learning Method and Program	2 in force	to Mar 2040

Patents held now

Soonest term end first.

Patent	Title	Status	Expires	Confidence
US 7,729,585	Light Source Apparatus with Modulation Function and Its Driving Method held by Nippon Telegraph and Telephone Corporation and NTT Electronics Corporation In force Term ends Jul 2, 2027 · High confidence	In force	Term ends Jul 2, 2027	High confidence
US 7,880,197	Avalanche Photodiode Having Doping Region with Monotonically Increasing Concentration Distribution held by NTT Electronics Corporation and Nippon Telegraph and Telephone Corporation In force Term ends Nov 26, 2027 · High confidence	In force	Term ends Nov 26, 2027	High confidence
US 8,019,468	Transport System and Transport Method held by NTT West, Inc. In force Term ends Jun 19, 2028 · High confidence	In force	Term ends Jun 19, 2028	High confidence
US 9,223,819	Linking of Parent-Child Data Records in a Legacy Software Modernization System held by NTT Data Canada, Inc. In force Ends no later than Aug 28, 2028 · Low confidence	In force	Ends no later than Aug 28, 2028	Low confidence
US 8,212,401	Redundant Isolation and Bypass of Critical Power Equipment held by NTT Global Data Centers Americas, Inc. In force Term ends Sep 14, 2028 · High confidence	In force	Term ends Sep 14, 2028	High confidence
US 8,121,724	Transfer System, and Transfer Method held by NTT West, Inc. In force Term ends Feb 16, 2029 · High confidence	In force	Term ends Feb 16, 2029	High confidence
US 8,294,297	Scalable Distributed Redundancy held by NTT Global Data Centers Americas, Inc. In force Term ends Feb 22, 2029 · High confidence	In force	Term ends Feb 22, 2029	High confidence
US 8,135,285	Optical Transmission System and Method held by Nippon Telegraph and Telephone Corporation and NTT Electronics Corporation In force Term ends Mar 7, 2029 · High confidence	In force	Term ends Mar 7, 2029	High confidence
US 8,467,637	Waveguide Path Coupling-Type Photodiode In force Term ends Jun 23, 2029 · High confidence	In force	Term ends Jun 23, 2029	High confidence
US 8,575,650	Avalanche Photodiode held by NTT Electronics Corporation and Nippon Telegraph and Telephone Corporation In force Term ends Dec 11, 2029 · High confidence	In force	Term ends Dec 11, 2029	High confidence

10 of 938 patents shown.

Pro members see all 938.

Pro members: see all 938 patents

Also on record, not counted in the 938: 66 patents in force now held by others · 82 patents ended · 1,919 applications pending · 251 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.

Fee due within 90 days marks a patent with a maintenance fee due within 90 days of the date this page was computed and not yet recorded paid, so it can end earlier than the bar shows. A fee left unpaid ends the patent at the close of the six month grace period that follows its due date, not on the due date itself. It is not a prediction that the fee will be missed.

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

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NTT, Inc.