Hifi Engineering Inc.
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 2 name spellings.
1
Ending by 2030
Jan 2029
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 Nov 30, 2026The maintenance fee for Method of making an acoustic sensor (US 11,662,489) comes due Nov 30, 2026. Unpaid by Jun 1, 2027, it lapses early.
- 2 fees due Dec 16 to 20, 2026 · next Dec 16
- 3 fees due Mar 12 to 24, 2027 · next Mar 12
- 1 fee due Apr 1, 2027The maintenance fee for Sound baffle device and system for detecting acoustic signals (US 10,428,644) comes due Apr 1, 2027. Unpaid by Oct 1, 2027, it lapses early.
- 1 fee due May 12, 2027The maintenance fee for Device and system for detecting dynamic strain (US 10,473,541) comes due May 12, 2027. Unpaid by Nov 12, 2027, it lapses early.
- 1 fee due Aug 20, 2027The maintenance fee for System and method for locating an area of interest in a conduit (US 11,906,394) comes due Aug 20, 2027. Unpaid by Feb 22, 2028, it lapses early.
- 1 fee due Sep 10, 2027The maintenance fee for Method and system for determining whether an event has occurred from dynamic strain measurements (US 10,584,960) comes due Sep 10, 2027. Unpaid by Mar 10, 2028, it lapses early.
- 2 fees due Oct 2 to 9, 2027 · next Oct 2
- 1 fee due Nov 7, 2027The maintenance fee for Optical Interrogator for Performing Interferometry Using Fiber Bragg Gratings (US 11,976,915) comes due Nov 7, 2027. Unpaid by May 8, 2028, it lapses early.
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 8,326,540 | Method and apparatus for fluid migration profiling In force · From the USPTO record | In force | From the USPTO record | |
| US 9,057,254 | Method for detecting and locating fluid ingress in a wellbore In force · From the USPTO record | In force | From the USPTO record | |
| US 9,605,537 | Method and system for determining relative depth of an acoustic event within a wellbore In force · From the USPTO record | In force | From the USPTO record | |
| US 10,234,345 | Method and System for Detecting Dynamic Strain In force · High confidence | In force | High confidence | |
| US 10,473,541 | Device and system for detecting dynamic strain In force · From the USPTO record | In force | From the USPTO record | |
| US 11,002,620 | Device and system for detecting dynamic strain In force · From the USPTO record | In force | From the USPTO record | |
| US 11,313,744 | Method and system for detecting dynamic strain In force · From the USPTO record | In force | From the USPTO record | |
| US 12,196,635 | Method and system for detecting dynamic strain In force · From the USPTO record | In force | From the USPTO record | |
| US 11,630,008 | Method and System for Detecting Dynamic Strain In force · Medium confidence | In force | Medium confidence | |
| US 9,606,250 | Loudness based method and system for determining relative location of an acoustic event along a channel In force · From the USPTO record | In force | From the USPTO record |
Also on record, not counted in the 47: 2 patents in force now held by others. 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