Duravent, Inc.
Held is read from USPTO's recorded assignments; a transfer never recorded there does not appear.
7
Ending by 2030
Jul 2027
Next term end
When these terms end
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 Dec 25, 2026The maintenance fee for Throttled direct vent termination (US 10,330,314) comes due Dec 25, 2026. Unpaid by Jun 25, 2027, it lapses early.
- 1 fee due Mar 22, 2027The maintenance fee for Retrofitted corrosive resistant venting system (US 9,140,450) comes due Mar 22, 2027. Unpaid by Sep 22, 2027, it lapses early.
- 1 fee due Sep 15, 2027The maintenance fee for Positive Pressure Pipe Coupling (US 9,285,066) comes due Sep 15, 2027. Unpaid by Mar 15, 2028, it lapses early.
Recent changes
Nothing was recorded against this company's patents in the last 90 days.
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 7,665,457 | Wall thimble with outside air inlet In force · From the USPTO record | In force | From the USPTO record | |
| US 8,505,981 | Gasket-less vent pipe coupling In force · From the USPTO record | In force | From the USPTO record | |
| US 8,408,196 | Ceiling support box with outside air inlet In force · From the USPTO record | In force | From the USPTO record | |
| US 8,230,849 | Wall thimble with outside air inlet In force · From the USPTO record | In force | From the USPTO record | |
| US 8,156,931 | Direct vent cap In force · From the USPTO record | In force | From the USPTO record | |
| US 8,672,367 | Exhaust system interlocking mechanism In force · From the USPTO record | In force | From the USPTO record | |
| US 10,125,899 | Modification device and vent hood having such a device In force · From the USPTO record | In force | From the USPTO record | |
| US 9,140,450 | Retrofitted corrosive resistant venting system In force · From the USPTO record | In force | From the USPTO record | |
| US 9,285,066 | Positive Pressure Pipe Coupling In force · High confidence | In force | High confidence | |
| US 9,377,141 | Adjustable clamp using standardized tool In force · From the USPTO record | In force | From the USPTO record |
Also on record, not counted in the 14: 1 lapsed for an unpaid fee · 4 ended at full term. 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.
Published applications
Every application published under this name has become a patent.