Q.E.D. Environmental Systems, Inc.

36 patents currently held · Updated Nov 14, 2026

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.

Recorded under 3 name spellings.

Ending by 2030

Jul 2031

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.

1 fee due Nov 23, 2026
The maintenance fee for Portable optical spectroscopy device for analyzing gas samples (US 11,656,125) comes due Nov 23, 2026. Unpaid by May 24, 2027, it lapses early.
4 fees due Dec 4 to 30, 2026 · next Dec 4
1 fee due Jan 4, 2027
The maintenance fee for Fluid level monitoring system and method incorporating pressure sensor system having inflatable/collapsible bag (US 11,692,433) comes due Jan 4, 2027. Unpaid by Jul 6, 2027, it lapses early.
1 fee due Oct 19, 2027
The maintenance fee for Well cap assembly (US 9,316,082) comes due Oct 19, 2027. Unpaid by Apr 19, 2028, it lapses early.

Which patents, and when each one lapses · Pro

Recent changes

1 of the patents on this record was granted 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 9,695,945	Fine Control Gas Valve In force Term ends Jul 31, 2031 · High confidence	In force	Term ends Jul 31, 2031	High confidence
US 8,756,991	Pneumatic Indicator for Detecting Liquid Level In force Term ends Jul 15, 2032 · High confidence	In force	Term ends Jul 15, 2032	High confidence
US 8,800,597	Fine Control Gas Valve In force Term ends Jan 23, 2033 · High confidence	In force	Term ends Jan 23, 2033	High confidence
US 10,029,291	Devices And Methods For Landfill Gas Well Monitoring And Control In force Term ends Jun 3, 2033 · High confidence	In force	Term ends Jun 3, 2033	High confidence
US 10,144,043	Devices And Methods For Landfill Gas Well Monitoring And Control In force Term ends Jun 3, 2033 · High confidence	In force	Term ends Jun 3, 2033	High confidence
US 8,678,348	Gas flow control valve In force Term ends Aug 16, 2033 · From the USPTO record	In force	Term ends Aug 16, 2033	From the USPTO record
US 9,068,421	Molded Well Head Cover In force Term ends Sep 4, 2033 · High confidence	In force	Term ends Sep 4, 2033	High confidence
US 9,062,536	Devices and Methods for Landfill Gas Well Monitoring and Control In force Term ends Sep 25, 2033 · High confidence	In force	Term ends Sep 25, 2033	High confidence
US 9,926,759	Removable Orifice Plate Device In force Term ends Oct 22, 2033 · High confidence	In force	Term ends Oct 22, 2033	High confidence
US 9,316,082	Well cap assembly In force Term ends Dec 25, 2033 · From the USPTO record	In force	Term ends Dec 25, 2033	From the USPTO record

10 of 36 patents shown.

Pro members see all 36.

Pro members: see all 36 patents

Also on record, not counted in the 36: 2 patents in force now held by others · 7 lapsed for an unpaid fee · 30 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.

2 pending · 9 abandoned · 3 no status recorded

List them