83 patents currently held

1 more in force is now held by another company

Held is read from USPTO's recorded assignments; a transfer never recorded there does not appear.

The next term ends in Jun 2027. from the record

Free plan: 3 watched companies. Pro: unlimited.

Alerts on its grants, lapses and transfers.

Ending by 2030

Jun 2027

Next term end

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

Filter Loading US 8,480,373

The most cited patent in this portfolio, cited by 167 later US patents, top 5% of utility patents granted in 2013 in our data. Protection runs to 2027.

Ends Jun 2027 · Medium confidence Also notable

Method of Operating a Safety Vacuum Release System US 8,313,306

Cited by 78 later US patents, top 10% of utility patents granted in 2012 in our data, and renewed at 3 of 3 maintenance windows. Protection runs to 2030.

Ends Nov 2030 · High confidence Also notable

Method of Controlling a Pump and Motor US 9,556,874

Cited by 35 later US patents, top 10% of utility patents granted in 2017 in our data, and renewed at every maintenance window due so far. Protection runs to 2031.

Ends May 2031 · 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 Jan 23, 2027
The maintenance fee for Automatic Identification of the Type of Motor (US 10,359,472) comes due Jan 23, 2027. Unpaid by Jul 23, 2027, it lapses early.
1 fee due Feb 20, 2027
The maintenance fee for System Parameter Identification Method Based on Rate-Limited Relay with Hysteresis and Sinusoidal Injection (US 10,386,808) comes due Feb 20, 2027. Unpaid by Aug 20, 2027, it lapses early.
1 fee due Mar 5, 2027
The maintenance fee for Motor Controller Providing a Dual-Channel Functional-Safety Safe-Torque-Off Function (US 11,749,982) comes due Mar 5, 2027. Unpaid by Sep 7, 2027, it lapses early.
3 fees due Apr 8 to 29, 2027 · next Apr 8
1 fee due May 19, 2027
The maintenance fee for One-Click Motor Configuration (US 10,481,568) comes due May 19, 2027. Unpaid by Nov 19, 2027, it lapses early.
1 fee due Jun 5, 2027
The maintenance fee for Method for Detecting Low Impedance Condition at Output of Electrical Converter, Control Unit, Computer Program Product and Electrical Converter (US 11,837,964) comes due Jun 5, 2027. Unpaid by Dec 6, 2027, it lapses early.
1 fee due Jul 2, 2027
The maintenance fee for Method for Reducing Regenerated Energy and Reversal Stress in a Reciprocating Load Powered by an Electric Motor by Modulating Motor Speed Using a Variable Frequency Drive and Variable Frequency Drive Provided for Performing the Method (US 11,863,113) comes due Jul 2, 2027. Unpaid by Jan 3, 2028, it lapses early.
1 fee due Aug 23, 2027
The maintenance fee for Method for Automatically Estimating a Friction Coefficient in a Mechanical System (US 9,268,316) comes due Aug 23, 2027. Unpaid by Feb 23, 2028, it lapses early.

Which patents, and when each one lapses · Pro

Recent changes

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

What they patent

The 5 largest of its 66 families, grouped by real patent family and labeled by the earliest filing in each. No technology classification is inferred from titles.

Frequency Converter	6 in force	to Aug 2040
Control Panel Module	4 in force	to Dec 2040
Method of Operating a Safety Vacuum Release System	4 in force	to Apr 2031
Load-Adaptive Smooth Startup Method for Sensorless Field-Oriented Control of Permanent Magnet Synchronous Motors	3 in force	to Apr 2035
Control Cabinet	2 in force	to Jul 2040

Patents held now

Soonest term end first.

Patent	Title	Status	Expires	Confidence
US 8,480,373	Filter Loading In force Term ends Jun 8, 2027 · Medium confidence	In force	Term ends Jun 8, 2027	Medium confidence
US 8,602,745	Anti-Entrapment and Anti-Dead Head Function In force Term ends Mar 22, 2028 · Medium confidence	In force	Term ends Mar 22, 2028	Medium confidence
US 8,602,743	Method of Operating a Safety Vacuum Release System In force Term ends Oct 25, 2029 · High confidence	In force	Term ends Oct 25, 2029	High confidence
US 10,724,263	Safety Vacuum Release System In force Term ends Jul 11, 2030 · Medium confidence	In force	Term ends Jul 11, 2030	Medium confidence
US 8,313,306	Method of Operating a Safety Vacuum Release System In force Term ends Nov 26, 2030 · High confidence	In force	Term ends Nov 26, 2030	High confidence
US 9,726,184	Safety Vacuum Release System In force Ends no later than Apr 28, 2031 · Medium confidence	In force	Ends no later than Apr 28, 2031	Medium confidence
US 9,556,874	Method of Controlling a Pump and Motor In force Term ends May 3, 2031 · High confidence	In force	Term ends May 3, 2031	High confidence
US 9,268,316	Method for Automatically Estimating a Friction Coefficient in a Mechanical System In force Term ends Jun 6, 2032 · High confidence	In force	Term ends Jun 6, 2032	High confidence
US 9,041,337	Motion Profile Generator In force Term ends Feb 16, 2033 · High confidence	In force	Term ends Feb 16, 2033	High confidence
US 9,781,860	Cooling Method for Devices Generating Waste Heat In force Term ends Dec 28, 2033 · High confidence	In force	Term ends Dec 28, 2033	High confidence

10 of 83 patents shown.

Pro members see all 83.

Pro members: see all 83 patents

Also on record, not counted in the 83: 1 patent in force now held by others · 28 patents ended · 23 applications pending · 9 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.

Export every term end as CSV · Pro

Danfoss Power Electronics A/S