578 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.
1 more record may belong here and awaits a decision; it is not counted.
The next term ends in Nov 2026. from the record
Free plan: 3 watched companies. Pro: unlimited.
Alerts on its grants, lapses and transfers.
91
Ending by 2030
Nov 2026
Next term end
378
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 May 2038 · High confidence
Also notable
Ends Nov 2026 · High confidence
Also notable
Ends Feb 2039 · High confidence
Buck-Converter-Based Drive Circuits for Driving Motors of Compressors and Condenser Fans
US 11,387,729
Cited by 67 later US patents, top 1% of utility patents granted in 2022 in our data. Protection runs to 2038.
Compressor Diagnostic and Protection System and Method
US 7,878,006
Cited by 156 later US patents, top 5% of utility patents granted in 2011 in our data, and renewed at 3 of 3 maintenance windows. Protection runs to 2026.
Co-Rotating Compressor
US 10,995,754
Cited by 19 later US patents, top 10% of utility patents granted in 2021 in our data. Protection runs to 2039.
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.
- 11 fees due Dec 4 to 27, 2026 · next Dec 4
- 11 fees due Jan 2 to 21, 2027 · next Jan 2
- 12 fees due Feb 1 to 25, 2027 · next Feb 1
- 14 fees due Mar 1 to 26, 2027 · next Mar 1
- 11 fees due Apr 6 to 29, 2027 · next Apr 6
- 12 fees due May 5 to 26, 2027 · next May 5
- 8 fees due Jun 3 to 30, 2027 · next Jun 3
- 10 fees due Jul 9 to 30, 2027 · next Jul 9
- 10 fees due Aug 2 to 25, 2027 · next Aug 2
- 9 fees due Sep 1 to 30, 2027 · next Sep 1
- 17 fees due Oct 2 to 28, 2027 · next Oct 2
- 3 fees due Nov 3 to 5, 2027 · next Nov 3
Recent changes
- 10 of the patents on this record were granted since Aug 16, 2026
- 6 terms have ended since Aug 16, 2026
What they patent
The 5 largest of its 378 families, grouped by real patent family and labeled by the earliest filing in each. No technology classification is inferred from titles.
| Temperature Sensing Circuit For Transmitting Data Across Isolation Barrier | 15 in force | to May 2038 |
| System And Method Of Controlling A Variable-Capacity Compressor | 8 in force | to Apr 2037 |
| Compressor Protection and Grid Fault Detection Device | 7 in force | to May 2030 |
| Compressor Having Capacity Modulation Assembly | 6 in force | to Dec 2030 |
| Vehicle Air Conditioning Control Systems | 5 in force | to Jan 2039 |
Patents held now
Soonest term end first.
| Patent | Title | Status | Expires | Confidence |
|---|---|---|---|---|
| US 7,878,006 | Compressor Diagnostic and Protection System and Method In force · High confidence | In force | High confidence | |
| US 7,503,182 | Condensing Unit Configuration System In force · High confidence | In force | High confidence | |
| US D673,509 | Contactor Housing In force · High confidence | In force | High confidence | |
| US 7,647,790 | Injection System and Method for Refrigeration System Compressor In force · High confidence | In force | High confidence | |
| US 7,484,374 | Flash Tank Design and Control for Heat Pumps In force · Medium confidence | In force | Medium confidence | |
| US 8,020,402 | Flash Tank Design and Control for Heat Pumps In force · Medium confidence | In force | Medium confidence | |
| US 7,827,809 | Flash Tank Design and Control for Heat Pumps In force · Medium confidence | In force | Medium confidence | |
| US 8,181,478 | Refrigeration System In force · High confidence | In force | High confidence | |
| US 8,505,331 | Flash Tank Design and Control for Heat Pumps In force · Medium confidence | In force | Medium confidence | |
| US 7,606,683 | Cooling System Design Simulator In force · High confidence | In force | High confidence |
Also on record, not counted in the 578: 1 patent in force now held by others · 121 patents ended · 62 applications pending · 14 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.