Kalsi Engineering, Inc.
Held is read from USPTO's recorded assignments; a transfer never recorded there does not appear.
Recorded under 2 name spellings.
6
Ending by 2030
Jan 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.
- 2 fees due Dec 6 to 25, 2026 · next Dec 6
- 1 fee due Feb 11, 2027The maintenance fee for Rotary seal with truncated wave form (US 9,103,445) comes due Feb 11, 2027. Unpaid by Aug 11, 2027, it lapses early.
- 1 fee due Mar 1, 2027The maintenance fee for Rotary seal with supported inlet (US 9,121,503) comes due Mar 1, 2027. Unpaid by Sep 1, 2027, it lapses early.
- 1 fee due Apr 8, 2027The maintenance fee for Seal arrangement for rotating equipment (US 10,435,981) comes due Apr 8, 2027. Unpaid by Oct 8, 2027, it lapses early.
- 1 fee due Oct 19, 2027The maintenance fee for Pressure-balanced floating seal housing assembly and method (US 9,316,319) comes due Oct 19, 2027. Unpaid by Apr 19, 2028, it lapses early.
Recent changes
- 1 term has 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 7,798,496 | Rotary Shaft Sealing Assembly In force · High confidence | In force | High confidence | |
| US 8,550,467 | Rotary Seal with Improved Film Distribution In force · Medium confidence | In force | Medium confidence | |
| US 9,103,445 | Rotary seal with truncated wave form In force · From the USPTO record | In force | From the USPTO record | |
| US 9,316,319 | Pressure-balanced floating seal housing assembly and method In force · From the USPTO record | In force | From the USPTO record | |
| US 9,429,238 | Dynamic backup ring assembly In force · From the USPTO record | In force | From the USPTO record | |
| US 9,845,879 | High pressure dynamic sealing arrangement In force · From the USPTO record | In force | From the USPTO record | |
| US 9,121,503 | Rotary seal with supported inlet In force · From the USPTO record | In force | From the USPTO record | |
| US 10,330,203 | High pressure dynamic sealing device In force · From the USPTO record | In force | From the USPTO record | |
| US 10,302,200 | Seal for Bi-Directional Rotation and Pressure In force · High confidence | In force | High confidence | |
| US 10,435,981 | Seal arrangement for rotating equipment In force · From the USPTO record | In force | From the USPTO record |
Also on record, not counted in the 18: 4 lapsed for an unpaid fee · 26 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
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 · 2 no status recorded