29 patents currently held
14 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 14 now held by other companies, 13 name Defond Electech Co. Ltd. as their current owner, and 1 more name another party. Each row says which.
Free plan: 3 watched companies. Pro: unlimited.
Alerts on its grants, lapses and transfers.
4
Ending by 2030
Jul 2027
Next term end
29
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 Nov 2027 · High confidence
Also notable
Ends Nov 2037 · High confidence
Also notable
Ends Jul 2027 · High confidence
Electrical Appliance with Battery Protection
US 7,619,391
The most cited patent in this portfolio, cited by 29 later US patents, top 25% of utility patents granted in 2009 in our data. Protection runs to 2027.
Control Knob for Controlling Operation of a Machine
US 10,649,556
The newest of the three, granted 2020. It anchors the portfolio to 2037, later than anything else here.
Trigger Mechanism
US 7,476,821
Renewed at every maintenance window since the 2009 grant; no more fees are due before its term ends in 2027.
Formerly held, still cited
Notable
Ends Jan 2041 · High confidence
Cited by 6 later US patents, top 25% of utility patents granted in 2023 in our data. Protection runs to 2041.
now held by Defond Electech Co., Ltd.
Also notable
Ends Aug 2037 · High confidence
Cited by 18 later US patents, top 25% of utility patents granted in 2019 in our data, and renewed at 2 of 3 maintenance windows. Protection runs to 2037.
now held by Defond Electech Co., Ltd.
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 30, 2026The maintenance fee for Variable-Speed Control Assembly for an Electric Device (US 11,664,710) comes due Nov 30, 2026. Unpaid by Jun 1, 2027, it lapses early.
- 1 fee due Jan 4, 2027The maintenance fee for Lock-Off Mechanism for Locking-Off a Trigger Assembly of an Electric Device (US 11,694,862) comes due Jan 4, 2027. Unpaid by Jul 6, 2027, it lapses early.
- 1 fee due Mar 17, 2027The maintenance fee for Contact Lever for Use in an Electrical Switch Assembly (US 10,418,195) comes due Mar 17, 2027. Unpaid by Sep 17, 2027, it lapses early.
- 1 fee due May 21, 2027The maintenance fee for Contact Lever Assembly for Use with an Electrical Switch (US 11,823,856) comes due May 21, 2027. Unpaid by Nov 22, 2027, it lapses early.
- 1 fee due Jun 3, 2027The maintenance fee for Electrical Switch for an Electrical Device and Sealing Assembly for an Electrical Switch (US 10,497,523) comes due Jun 3, 2027. Unpaid by Dec 3, 2027, it lapses early.
- 2 fees due Aug 20 to 27, 2027 · next Aug 20
- 2 fees due Nov 7 to 12, 2027 · next Nov 7
Recent changes
- 1 term has ended since Aug 16, 2026
What they patent
The 3 largest of its 29 families, grouped by real patent family and labeled by the earliest filing in each. No technology classification is inferred from titles.
| Electrical Switch with a Sealing Member for Use with an Electrical Device | 1 in force | to Nov 2038 |
| Control Knob for Controlling Operation of a Machine | 1 in force | to Nov 2037 |
| Electrical Switch for an Electrical Device and Sealing Assembly for an Electrical Switch | 1 in force | to Oct 2037 |
Patents held now
Soonest term end first.
| Patent | Title | Status | Expires | Confidence |
|---|---|---|---|---|
| US 7,476,821 | Trigger Mechanism In force · High confidence | In force | High confidence | |
| US 7,619,391 | Electrical Appliance with Battery Protection In force · High confidence | In force | High confidence | |
| US 7,723,632 | Electrical Switch In force · High confidence | In force | High confidence | |
| US 7,754,989 | Electrical Switch In force · High confidence | In force | High confidence | |
| US 8,604,376 | Electrical Switch In force · High confidence | In force | High confidence | |
| US 8,907,233 | Electrical Switch In force · High confidence | In force | High confidence | |
| US 8,859,915 | Electrical Switch held by Defond Electech Co., Ltd. and Defond Components Limited In force · High confidence | In force | High confidence | |
| US 9,756,740 | Electrical Switch Assembly In force · High confidence | In force | High confidence | |
| US 10,083,804 | Speed Control Switch held by Defond Electech Co., Ltd. and Defond Components Limited In force · High confidence | In force | High confidence | |
| US 10,147,567 | Push-Button Switch Capable of Adjusting Output Power held by Defond Electech Co., Ltd. and Defond Components Limited In force · High confidence | In force | High confidence |
Also on record, not counted in the 29: 14 patents in force now held by others · 38 patents ended · 1 application pending · 17 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.