Castrol Limited
4 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.
3
Ending by 2030
Sep 2028
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 Jan 14 to 23, 2027 · next Jan 14
- 1 fee due Feb 22, 2027The maintenance fee for Aqueous metalworking fluids and methods for using the same (US 11,732,212) comes due Feb 22, 2027. Unpaid by Aug 23, 2027, it lapses early.
- 1 fee due Mar 8, 2027The maintenance fee for Non-aqueous lubricant and fuel compositions comprising fatty acid esters of hydroxy-carboxylic acids, and uses thereof (US 9,127,232) comes due Mar 8, 2027. Unpaid by Sep 8, 2027, it lapses early.
- 2 fees due Oct 9 to 14, 2027 · next Oct 9
Recent changes
- 2 of the patents on this record were granted since Aug 17, 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 8,703,872 | Multiple function graft polymer In force · From the USPTO record | In force | From the USPTO record | |
| US 8,327,818 | Apparatus and method for adding one or more additives to an engine lubricant In force · From the USPTO record | In force | From the USPTO record | |
| US 10,190,070 | Multiple-function dispersant graft polymer In force · From the USPTO record | In force | From the USPTO record | |
| US 9,080,120 | Uses and compositions In force · From the USPTO record | In force | From the USPTO record | |
| US 9,828,564 | Non-aqueous lubricant and fuel compositions comprising fatty acid esters of hydroxy-carboxylic acids, and uses thereof In force · From the USPTO record | In force | From the USPTO record | |
| US 9,127,232 | Non-aqueous lubricant and fuel compositions comprising fatty acid esters of hydroxy-carboxylic acids, and uses thereof In force · From the USPTO record | In force | From the USPTO record | |
| US 8,603,954 | Graft Polymer and Related Methods and Compositions In force · High confidence | In force | High confidence | |
| US 8,703,873 | Multiple Function Graft Polymer In force · High confidence | In force | High confidence | |
| US D815,169 | Engine component In force · From the USPTO record | In force | From the USPTO record | |
| US 12,116,912 | Container, method and control system In force · From the USPTO record | In force | From the USPTO record |
Also on record, not counted in the 43: 4 patents in force now held by others · 36 lapsed for an unpaid fee · 56 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.
7 pending · 2 abandoned · 25 no status recorded