Five patents currently held, every record listed here
1 more in force is now held by another company
Held is read from USPTO's recorded assignments; a transfer never recorded there does not appear.
The next term ends in Oct 2032. from the record
Free plan: 3 watched companies. Pro: unlimited.
Alerts on its grants, lapses and transfers.
0
Ending by 2030
Oct 2032
Next term end
5
Patent families
When these terms end
Each bar runs from grant to computed term end. 2015 to 2044.
US 10,682,634
Method for Preparation of Modified Catalysts with High Catalytic Performance and Low Coking Rate
Dec 18, 2037
20212027203320392044
3 pending applications: term is not computable until grant.Updated Nov 15, 2026 · includes USPTO assignment & status data published Nov 15, 2026 and grant & fee data published Nov 10, 2026 (weekly) · how we know
Notable patents
Ranked by citations and family size, against patents of the same kind granted the same year. How we rank
Notable
Ends Dec 2037 · High confidence
Also notable
Ends Oct 2032 · High confidence
Also notable
Ends Sep 2035 · High confidence
Method for Preparation of Modified Catalysts with High Catalytic Performance and Low Coking Rate
US 10,682,634
The newest of the three, granted 2020. It anchors the portfolio to 2037, later than anything else here.
Conversion of Propane to Propylene
US 8,940,954
Granted 2015 and renewed at every maintenance window due so far. Protection runs to 2032.
Production of Isobutylene, Isoamylene, or Alkylates from Mixed Alkanes
US 10,322,987
Granted 2019. Computed term ends 2035. A terminal disclaimer caps this term to an earlier patent's.
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 18, 2026The maintenance fee for Production of Isobutylene, Isoamylene, or Alkylates from Mixed Alkanes (US 10,322,987) comes due Dec 18, 2026. Unpaid by Jun 21, 2027, it lapses early.
Recent changes
Nothing was recorded against this company's patents in the last 90 days.
What they patent
The 4 largest of its 5 families, grouped by real patent family and labeled by the earliest filing in each. No technology classification is inferred from titles.
| Viscosifier Removal from Brines | 1 in force | to Mar 2044 |
| Recovery of Bromine from Waste Bromide Brines | 1 in force | to Jan 2043 |
| Production of Isobutylene, Isoamylene, or Alkylates from Mixed Alkanes | 1 in force | to Sep 2035 |
| Conversion of Propane to Propylene | 1 in force | to Oct 2032 |
Patents held now
Soonest term end first.
Showing 1 to 5 of 5
| Patent | Title | Status | Expires | Confidence |
|---|---|---|---|---|
| US 8,940,954 | Conversion of Propane to Propylene In force · High confidence | In force | High confidence | |
| US 10,322,987 | Production of Isobutylene, Isoamylene, or Alkylates from Mixed Alkanes In force · High confidence | In force | High confidence | |
| US 10,682,634 | Method for Preparation of Modified Catalysts with High Catalytic Performance and Low Coking Rate In force · High confidence | In force | High confidence | |
| US 12,071,353 | Recovery of Bromine from Waste Bromide Brines In force · High confidence | In force | High confidence | |
| US 12,492,138 | Viscosifier Removal from Brines In force · High confidence | In force | High confidence |
Also on record, not counted in the 5: 1 patent in force now held by others · 34 patents ended · 3 applications pending · 15 applications 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.
Computed patent terms end on the dates shown. Related patents and pending applications may cover overlapping subject matter.