Diversitech Corporation

79 patents currently held · Updated Nov 14, 2026

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.

Recorded under 3 name spellings.

Ending by 2030

Nov 2026

Next term end

When these terms end

5 yrs10 yrs20 yrs

Held patents by the year their term ends

20262027202820292030203120322033203420352036203720382039204020412042204320442045

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.

2 fees due Feb 15 to 22, 2027 · next Feb 15
1 fee due Mar 29, 2027
The maintenance fee for Tube and Pipe Benders and Methods of Bending Same (US 9,144,835) comes due Mar 29, 2027. Unpaid by Sep 29, 2027, it lapses early.
4 fees due Apr 13 to 30, 2027 · next Apr 13
2 fees due May 10 to 21, 2027 · next May 10
1 fee due Jun 12, 2027
The maintenance fee for Apparatus and Method for Cutting and Stripping an Electrical Cable (US 11,843,230) comes due Jun 12, 2027. Unpaid by Dec 13, 2027, it lapses early.
1 fee due Aug 16, 2027
The maintenance fee for Apparatus and Method for Collection and Disposal of Cleaning Waste-Water and Debris from Air Conditioners (US 9,259,769) comes due Aug 16, 2027. Unpaid by Feb 16, 2028, it lapses early.

Which patents, and when each one lapses · Pro

Recent changes

2 of the patents on this record were granted since Aug 16, 2026
2 terms have ended since Aug 16, 2026

Patents held now

Soonest term end first. Each date below is computed on that patent's own page, which shows the rule, the adjustments and the fee history it was derived from.

Patent	Title	Status	Expires	Confidence
US D671,069	Capacitor Housing In force Term ends Nov 20, 2026 · High confidence	In force	Term ends Nov 20, 2026	High confidence
US 7,521,639	Safety Switch In force Term ends Apr 19, 2027 · High confidence	In force	Term ends Apr 19, 2027	High confidence
US 7,437,941	Heating and Air Conditioning Service Gauge In force Term ends May 2, 2027 · High confidence	In force	Term ends May 2, 2027	High confidence
US 7,685,882	Heating and Air Conditioning Service Gauge In force Term ends May 2, 2027 · High confidence	In force	Term ends May 2, 2027	High confidence
US D685,898	Filter Frame In force Term ends Jul 9, 2027 · High confidence	In force	Term ends Jul 9, 2027	High confidence
US D687,473	Reinforced Equipment Pad In force Term ends Aug 6, 2027 · High confidence	In force	Term ends Aug 6, 2027	High confidence
US 8,069,731	Heating and Air Conditioning Service Gauge In force Term ends Sep 22, 2027 · High confidence	In force	Term ends Sep 22, 2027	High confidence
US D691,709	Drain Line Device In force Term ends Oct 15, 2027 · High confidence	In force	Term ends Oct 15, 2027	High confidence
US D708,311	Filter Frame In force Term ends Jul 1, 2028 · High confidence	In force	Term ends Jul 1, 2028	High confidence
US D708,729	Filter Frame In force Term ends Jul 8, 2028 · High confidence	In force	Term ends Jul 8, 2028	High confidence

10 of 79 patents shown.

Pro members see all 79.

Pro members: see all 79 patents

Also on record, not counted in the 79: 7 patents in force now held by others · 14 lapsed for an unpaid fee · 35 ended at full term · 1 surrendered on reissue. List them

Sources and methods

Compiled from the USPTO record, grants, published applications and recorded assignments, not yet reviewed by hand. How this record was built

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

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Published applications

US patent applications published under this name that have not become patents. An application is published about eighteen months after its earliest filing; one that has not been published is in no public record.

3 pending · 2 abandoned · 2 no status recorded

List them