Celgard, LLC
12 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.
12
Ending by 2030
Dec 2026
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 23, 2026The maintenance fee for Microporous battery separators including polyolefin layer and non-woven layer with alkylbenzene sulfonic acid lithium salt surfactant, lithium batteries utilizing the same, and methods of manufacture of the same (US 11,658,333) comes due Nov 23, 2026. Unpaid by May 24, 2027, it lapses early.
- 1 fee due Dec 25, 2026The maintenance fee for Multilayer microporous separators for lithium ion secondary batteries and related methods (US 10,333,125) comes due Dec 25, 2026. Unpaid by Jun 25, 2027, it lapses early.
- 3 fees due Jan 9 to 25, 2027 · next Jan 9
- 4 fees due Feb 8 to 22, 2027 · next Feb 8
- 3 fees due Apr 10 to 29, 2027 · next Apr 10
- 2 fees due May 7 to 14, 2027 · next May 7
- 1 fee due Jun 5, 2027The maintenance fee for Separators, batteries, systems, vehicles, and related methods (US 11,833,763) comes due Jun 5, 2027. Unpaid by Dec 6, 2027, it lapses early.
- 2 fees due Jul 23 to 28, 2027 · next Jul 23
- 2 fees due Aug 11 to 20, 2027 · next Aug 11
- 3 fees due Sep 1 to 24, 2027 · next Sep 1
- 4 fees due Oct 2 to 30, 2027 · next Oct 2
Recent changes
- 4 of the patents on this record were granted since Aug 16, 2026
- 3 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 10,818,899 | Co-extruded, multi-layered battery separator In force · From the USPTO record | In force | From the USPTO record | |
| US 12,166,166 | Membrane made of a blend of UHMW polyolefins In force · From the USPTO record | In force | From the USPTO record | |
| US 11,563,256 | Method of Making a Microporous Material In force · High confidence | In force | High confidence | |
| US 9,570,727 | Battery separator with Z-direction stability In force · From the USPTO record | In force | From the USPTO record | |
| US 7,794,511 | Battery separator for lithium polymer battery In force · From the USPTO record | In force | From the USPTO record | |
| US 7,662,510 | X-ray sensitive battery separator and a method for detecting the position of a separator in a battery In force · From the USPTO record | In force | From the USPTO record | |
| US 10,003,058 | Method of making a co-extruded, multi-layered battery separator In force · From the USPTO record | In force | From the USPTO record | |
| US 12,179,469 | Biaxially Oriented Microporous Membrane In force · High confidence | In force | High confidence | |
| US 11,420,416 | Biaxially Oriented Microporous Membrane In force · High confidence | In force | High confidence | |
| US 9,274,068 | Methods related to X-ray sensitive battery separators In force · From the USPTO record | In force | From the USPTO record |
Also on record, not counted in the 112: 12 patents in force now held by others · 20 lapsed for an unpaid fee · 90 ended at full term · 1 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.
34 pending · 4 abandoned · 40 no status recorded