30 patents currently held
Held is read from USPTO's recorded assignments; a transfer never recorded there does not appear.
The next term ends in Aug 2030. from the record
Free plan: 3 watched companies. Pro: unlimited.
Alerts on its grants, lapses and transfers.
1
Ending by 2030
Aug 2030
Next term end
22
Patent families
When these terms end
Held patents by the year their term ends
notable patents
fee due within 90 days
all others
Updated Nov 14, 2026 · includes USPTO assignment & status data published Nov 14, 2026 and grant & fee data published Nov 10, 2026 (weekly) · how we know
Notable: the highest-ranked patents in this portfolio by citations and family size. Fee due within 90 days: a maintenance fee is due within 90 days of when this page was computed and not yet paid.
Notable patents
Ranked by citations and family size, against patents of the same kind granted the same year. How we rank
Notable
Ends Dec 2033 · High confidence
Also notable
Ends Oct 2031 · High confidence
Also notable
Ends Oct 2038 · High confidence
Tracers
US 9,856,732
The most cited patent in this portfolio, cited by 36 later US patents, top 10% of utility patents granted in 2018 in our data. Protection runs to 2033.
Method for Using Tracer Flowback for Estimating Influx Volumes of Fluids from Different Influx Zones
US 8,949,029
Cited by 25 later US patents, top 25% of utility patents granted in 2015 in our data, and renewed at 3 of 3 maintenance windows. Protection runs to 2031.
Targeted Tracer Injection with Online Sensor
US 11,492,897
Cited by 6 later US patents, top 25% of utility patents granted in 2022 in our data. Protection runs to 2038.
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 13, 2026The maintenance fee for Method for Extracting Downhole Flow Profiles from Tracer Flowback Transients (US 11,674,382) comes due Dec 13, 2026. Unpaid by Jun 14, 2027, it lapses early.
Recent changes
- Sep 24Assignment recorded on 1 record: Hartvig, Sven Kristian and 3 others to Resman Technology As Recorded Sep 24, 2026, executed Sep 17, 2026. Conveyance as recorded: Assignment of Assignor's Interest. A recorded assignment is a filed document, not a statement of current ownership. Reel 76552, frame 288.
- 1 of the patents on this record was granted since Aug 16, 2026
What they patent
The 5 largest of its 22 families, grouped by real patent family and labeled by the earliest filing in each. No technology classification is inferred from titles.
| Method for Extracting Downhole Flow Profiles from Tracer Flowback Transients | 6 in force | to Dec 2035 |
| Reservoir Inflow Monitoring | 2 in force | to Dec 2041 |
| A Method and Apparatus for Quantitative Multi-Phase Downhole Surveillance | 2 in force | to Dec 2040 |
| Targeted Tracer Injection with Online Sensor | 2 in force | to Oct 2038 |
| Monitoring and Detecting Seal Integrity with Tracers | 1 in force | to Aug 2044 |
Patents held now
Soonest term end first.
| Patent | Title | Status | Expires | Confidence |
|---|---|---|---|---|
| US 8,603,827 | Novel Tracer Materials In force · High confidence | In force | High confidence | |
| US 8,949,029 | Method for Using Tracer Flowback for Estimating Influx Volumes of Fluids from Different Influx Zones In force · High confidence | In force | High confidence | |
| US 10,669,839 | Method for Extracting Downhole Flow Profiles from Tracer Flowback Transients In force · High confidence | In force | High confidence | |
| US 10,871,067 | Method for Extracting Downhole Flow Profiles from Tracer Flowback Transients In force · High confidence | In force | High confidence | |
| US 10,961,842 | Method for Extracting Downhole Flow Profiles from Tracer Flowback Transients In force · High confidence | In force | High confidence | |
| US 11,674,382 | Method for Extracting Downhole Flow Profiles from Tracer Flowback Transients In force · Medium confidence | In force | Medium confidence | |
| US 10,151,198 | Tracer Based Flow Measurement In force · High confidence | In force | High confidence | |
| US 9,856,732 | Tracers In force · High confidence | In force | High confidence | |
| US 9,664,035 | Monitoring of Multilayer Reservoirs In force · High confidence | In force | High confidence | |
| US 9,896,913 | Petroleum Well Tracer Release Flow Shunt Chamber In force · High confidence | In force | High confidence |
Also on record, not counted in the 30: 18 applications pending · 1 application abandoned. List them
Sources and methods
Compiled from USPTO application file histories, grants and recorded assignments, with the company's own names reviewed by hand. How this record was built
Portfolio grouped automatically from ownership conveyances to the names matched to this company, usually every name that begins with its own, so it counts patents an affiliate holds; each list row names the holder of record. Security interests are excluded and ambiguous records are not reviewed by hand.
Fee due within 90 days marks a patent with a maintenance fee due within 90 days of the date this page was computed and not yet recorded paid, so it can end earlier than the bar shows. A fee left unpaid ends the patent at the close of the six month grace period that follows its due date, not on the due date itself. It is not a prediction that the fee will be missed.
Computed patent terms end on the dates shown. Related patents and pending applications may cover overlapping subject matter.