Six patents currently held, every record listed here

2 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

Of the 2 now held by other companies, 2 name Greenvision Group Technologies Corporation as their current owner. Each row says so.

Free plan: 3 watched companies. Pro: unlimited.

Alerts on its grants, lapses and transfers.

Ending by 2030

Jul 2027

Next term end

Patent families

When these terms end

Each bar runs from grant to computed term end. 2009 to 2031.

US 8,067,905 Power Line Preconditioner for Improved LED Intensity Control Jul 31, 2027

US 8,421,368 Control of Light Intensity Using Pulses of a Fixed Duration and Frequency Aug 1, 2027

US 7,638,950 Power Line Preconditioner for Improved LED Intensity Control Jan 30, 2028

US 7,598,683 Control of Light Intensity Using Pulses of a Fixed Duration and Frequency Feb 15, 2028

US 8,604,709 Methods and Systems for Controlling Electrical Power to DC Loads Feb 15, 2028

US 8,628,198 Lighting Techniques for Wirelessly Controlling Lighting Elements Jul 8, 2029

US 9,330,585 Device for Displaying a Video Image on a Building Dec 7, 2030

US 8,903,577 Traction System for Electrically Powered Vehicles Nov 8, 2031

20142019202420292031

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

Notable

Lighting Techniques for Wirelessly Controlling Lighting Elements US 8,628,198

The most cited patent in this portfolio, cited by 31 later US patents, top 25% of utility patents granted in 2014 in our data. Protection runs to 2029.

Ends Jul 2029 · High confidence Also notable

Device for Displaying a Video Image on a Building US 9,330,585

Cited by 24 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 2030.

Ends Dec 2030 · High confidence Also notable

Control of Light Intensity Using Pulses of a Fixed Duration and Frequency US 7,598,683

Renewed at every maintenance window since the 2009 grant; no more fees are due before its term ends in 2028.

Ends Feb 2028 · High confidence

Formerly held, still cited

Notable

Methods and Systems for Controlling Electrical Power to DC Loads US 8,604,709

The most cited patent in this portfolio, cited by 212 later US patents, top 5% of utility patents granted in 2013 in our data. Protection runs to 2028. A terminal disclaimer caps this term to an earlier patent's.

now held by Greenvision Group Technologies Corporation

Ends Feb 2028 · 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 3, 2027
The maintenance fee for Device for Displaying a Video Image on a Building (US 9,330,585) comes due Nov 3, 2027. Unpaid by May 3, 2028, it lapses early.

Which patents, and when each one lapses · Pro

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.

Control of Light Intensity Using Pulses of a Fixed Duration and Frequency	2 in force	to Feb 2028
Power Line Preconditioner for Improved LED Intensity Control	2 in force	to Jan 2028
Device for Displaying a Video Image on a Building	1 in force	to Dec 2030
Lighting Techniques for Wirelessly Controlling Lighting Elements	1 in force	to Jul 2029

Patents held now

Soonest term end first.

Showing 1 to 6 of 6

Patent	Title	Status	Expires	Confidence
US 8,067,905	Power Line Preconditioner for Improved LED Intensity Control In force (reinstated) Term ends Jul 31, 2027 · High confidence	In force (reinstated)	Term ends Jul 31, 2027	High confidence
US 8,421,368	Control of Light Intensity Using Pulses of a Fixed Duration and Frequency In force Term ends Aug 1, 2027 · High confidence	In force	Term ends Aug 1, 2027	High confidence
US 7,638,950	Power Line Preconditioner for Improved LED Intensity Control In force Term ends Jan 30, 2028 · High confidence	In force	Term ends Jan 30, 2028	High confidence
US 7,598,683	Control of Light Intensity Using Pulses of a Fixed Duration and Frequency In force Term ends Feb 15, 2028 · High confidence	In force	Term ends Feb 15, 2028	High confidence
US 8,628,198	Lighting Techniques for Wirelessly Controlling Lighting Elements In force Term ends Jul 8, 2029 · High confidence	In force	Term ends Jul 8, 2029	High confidence
US 9,330,585	Device for Displaying a Video Image on a Building In force Term ends Dec 7, 2030 · High confidence	In force	Term ends Dec 7, 2030	High confidence

Also on record, not counted in the 6: 2 patents in force now held by others · 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.

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

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