Two patents currently held, every record listed here
7 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.
3 more records may belong here and await a decision; they are not counted.
The next term ends in Jun 2031. from the record
Of the 7 now held by other companies, 7 name Snell Holdings LLC as their current owner. Each row says so.
Free plan: 3 watched companies. Pro: unlimited.
Alerts on its grants, lapses and transfers.
0
Ending by 2030
Jun 2031
Next term end
2
Patent families
When these terms end
Each bar runs from grant to computed term end. 2010 to 2033.
US 8,139,476
Optical Ring Networks Using Circulating Optical Probe in Protection Switching with Automatic Reversion
Oct 2, 2028
US 7,773,883
Single-Fiber Optical Ring Networks Based on Optical Double Sideband Modulation
Dec 29, 2028
US 8,175,458
Optical Ring Networks Having Node-To-Node Optical Communication Channels for Carrying Data Traffic
no later than Jul 30, 2030
US 9,042,729
Minimizing Bandwidth Narrowing Penalities in a Wavelength Selective Switch Optical Network
Feb 1, 2031
US 9,641,278
Subchannel Photonic Routing, Switching and Protection with Simplified Upgrades of WDM Optical Networks
Jun 8, 2031
US 9,485,050
Subchannel Photonic Routing, Switching and Protection with Simplified Upgrades of WDM Optical Networks
no later than Nov 10, 2031
20152020202520302033
A dotted end marks a recorded terminal disclaimer this site has not resolved: the term can only be shorter than the bar, never longer.
Every computed term in this portfolio is shown above.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 patents
Ranked by citations and family size, against patents of the same kind granted the same year. How we rank
Only 2 of the currently held patents qualify as notable.
Notable
Ends Jun 2031 · Low confidence
Also notable
Ends Jun 2031 · High confidence
Optical Subchannel Routing, Protection Switching and Security
US 9,419,743
The most cited patent in this portfolio, cited by 26 later US patents, top 25% of utility patents granted in 2016 in our data. Protection runs to 2031. A terminal disclaimer caps this term to an earlier patent's.
Subchannel Photonic Routing, Switching and Protection with Simplified Upgrades of WDM Optical Networks
US 9,641,278
Granted 2017 and renewed at every maintenance window due so far. Protection runs to 2031.
Formerly held, still cited
Notable
Ends no later than Nov 2031 · Medium confidence
Cited by 18 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 2031. 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 Snell Holdings, LLC
Also notable
Ends no later than Jul 2030 · Medium confidence
Cited by 25 later US patents, top 25% of utility patents granted in 2012 in our data, and renewed at 3 of 3 maintenance windows. Protection runs to 2030. 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 Snell Holdings, LLC
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.
What they patent
Grouped by real patent family, largest first, labeled by the earliest filing in each. No technology classification is inferred from titles.
| Subchannel Photonic Routing, Switching and Protection with Simplified Upgrades of WDM Optical Networks | 1 in force | to Jun 2031 |
| Optical Subchannel Routing, Protection Switching and Security | 1 in force | to Jun 2031 |
Patents held now
Soonest term end first.
Showing 1 to 2 of 2
| Patent | Title | Status | Expires | Confidence |
|---|---|---|---|---|
| US 9,419,743 | Optical Subchannel Routing, Protection Switching and Security In force · Low confidence | In force | Low confidence | |
| US 9,641,278 | Subchannel Photonic Routing, Switching and Protection with Simplified Upgrades of WDM Optical Networks In force · High confidence | In force | High confidence |
Also on record, not counted in the 2: 7 patents in force now held by others · 12 patents ended · 7 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.
3 terminal disclaimers are on file with no resolved reference. No cap is applied and none is guessed