45 patents currently held
Held is read from USPTO's recorded assignments; a transfer never recorded there does not appear.
The next term ends in Dec 2026. from the record
Free plan: 3 watched companies. Pro: unlimited.
Alerts on its grants, lapses and transfers.
5
Ending by 2030
Dec 2026
Next term end
40
Patent families
When these terms end
Held patents by the year their term ends
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
Ends Sep 2033 · High confidence
Also notable
Ends Jan 2031 · High confidence
Also notable
Ends no later than Jan 2036 · Medium confidence
Coded Modulation for Small Step-Size Variable Spectral Efficiency
US 9,337,935
Cited by 15 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.
Coupling Multiple Conductor Undersea Optical Cables to an Undersea Device with an Isolated Bypass Conductive Path Across the Undersea Device
US 8,328,431
Renewed at every maintenance window since the 2012 grant; no more fees are due before its term ends in 2031.
Efficient Optical Signal Amplification Systems and Methods
US 9,967,051
Granted 2018 and renewed at every maintenance window due so far. Protection runs to 2036. 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.
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 Jan 2, 2027The maintenance fee for Separation Duct Having Longitudinal Spacers (US 10,337,652) comes due Jan 2, 2027. Unpaid by Jul 2, 2027, it lapses early.
- 3 fees due Feb 6 to 13, 2027 · next Feb 6
- 2 fees due Mar 3 to 8, 2027 · next Mar 3
- 2 fees due Apr 13 to 22, 2027 · next Apr 13
- 2 fees due Jun 3 to 30, 2027 · next Jun 3
- 3 fees due Nov 10 to 12, 2027 · next Nov 10
Recent changes
Nothing was recorded against this company's patents in the last 90 days.
What they patent
The 5 largest of its 40 families, grouped by real patent family and labeled by the earliest filing in each. No technology classification is inferred from titles.
Patents held now
Soonest term end first.
| Patent | Title | Status | Expires | Confidence |
|---|---|---|---|---|
| US 7,681,068 | System and Method for Providing Event Hysteresis in Network Management Systems In force · High confidence | In force | High confidence | |
| US 7,809,279 | System and Method Using Differential Loop Gain for Fault Identification in Line Monitoring Equipment In force · High confidence | In force | High confidence | |
| US 7,872,737 | System and Method for Optical Time Domain Reflectometry Using Multi-Resolution Code Sequences In force · High confidence | In force | High confidence | |
| US 8,559,773 | Coupling Multiple Conductor Undersea Optical Cables to an Undersea Device with an Isolated Bypass Conductive Path Across the Undersea Device In force · High confidence | In force | High confidence | |
| US 8,244,140 | Communicating with Components in Optical Communication Systems Using Voltage Signal Detection and Signature Analysis In force · High confidence | In force | High confidence | |
| US 8,328,431 | Coupling Multiple Conductor Undersea Optical Cables to an Undersea Device with an Isolated Bypass Conductive Path Across the Undersea Device In force · High confidence | In force | High confidence | |
| US 10,003,425 | Branching Configuration Including Separate Branching Unit and Predetermined Wavelength Filter Unit and System and Method Including the Same In force · High confidence | In force | High confidence | |
| US 8,280,205 | Fiber Optic Connector and Alignment Mechanism for Single Lens Multi-Fiber Connector In force · High confidence | In force | High confidence | |
| US 8,305,877 | System and Method for Distributed Fault Sensing and Recovery In force · High confidence | In force | High confidence | |
| US 8,401,392 | Flexible Branching Unit and System Including the Same In force · High confidence | In force | High confidence |
Also on record, not counted in the 45: 65 patents ended · 1 application 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.