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75 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 24 name spellings.
23
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 Nov 23 to 28, 2026 · next Nov 23
- 3 fees due Dec 4 to 25, 2026 · next Dec 4
- 4 fees due Jan 11 to 25, 2027 · next Jan 11
- 3 fees due Feb 8 to 18, 2027 · next Feb 8
- 1 fee due Mar 3, 2027The maintenance fee for Plant for producing oxygen by cryogenic air separation (US 10,401,083) comes due Mar 3, 2027. Unpaid by Sep 3, 2027, it lapses early.
- 13 fees due Apr 1 to 29, 2027 · next Apr 1
- 9 fees due May 3 to 28, 2027 · next May 3
- 6 fees due Jun 5 to 19, 2027 · next Jun 5
- 6 fees due Jul 5 to 28, 2027 · next Jul 5
- 6 fees due Aug 4 to 25, 2027 · next Aug 4
- 12 fees due Sep 1 to 30, 2027 · next Sep 1
- 4 fees due Oct 7 to 16, 2027 · next Oct 7
- 2 fees due Nov 7 to 10, 2027 · next Nov 7
Recent changes
- 15 of the patents on this record were granted since Aug 16, 2026
- 2 terms have 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 8,093,439 | Method for Oligomerization And/Or Polymerization of Ethylene with Flushing of Equipment and Piping In force · High confidence | In force | High confidence | |
| US 8,142,543 | Refining ferroalloys In force · From the USPTO record | In force | From the USPTO record | |
| US 7,554,002 | Method for cold supply to the low-temperature separation stage of an olefin plant In force · From the USPTO record | In force | From the USPTO record | |
| US 8,058,369 | Method for Operating Bubble Column Reactor for the Oligomerization of Ethylene In force · High confidence | In force | High confidence | |
| US 7,763,117 | Method for the manufacture of extended steel products In force · From the USPTO record | In force | From the USPTO record | |
| US 9,012,577 | Method for Preparing Linear Alpha-Olefins With Improved Heat Removal In force · High confidence | In force | High confidence | |
| US 7,572,363 | Steam generation in steam reforming processes In force · From the USPTO record | In force | From the USPTO record | |
| US 7,766,995 | Ozone production processes and its use in industrial processes In force · From the USPTO record | In force | From the USPTO record | |
| US 7,632,475 | Process for removing contaminants from gas streams In force · From the USPTO record | In force | From the USPTO record | |
| US 9,717,219 | Water inlet arrangement In force · From the USPTO record | In force | From the USPTO record |
Also on record, not counted in the 289: 75 patents in force now held by others · 429 lapsed for an unpaid fee · 657 ended at full term · 2 surrendered on reissue. 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.
56 pending · 73 abandoned · 332 no status recorded