1,523 patents currently held
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.
The next term ends in Oct 2037. from the record
Free plan: 3 watched companies. Pro: unlimited.
Alerts on its grants, lapses and transfers.
0
Ending by 2030
Oct 2037
Next term end
1,062
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 Mar 2038 · High confidence
Also notable
Ends Mar 2038 · High confidence
Also notable
Ends Sep 2039 · High confidence
Hybrid Bonding Contact Structure of Three-Dimensional Memory Device
US 10,593,690
Cited by 74 later US patents, top 5% of utility patents granted in 2020 in our data. Protection runs to 2038.
Through Array Contact Structure of Three-Dimensional Memory Device
US 10,553,604
Cited by 63 later US patents, top 5% of utility patents granted in 2020 in our data. Protection runs to 2038.
Three-Dimensional Memory Device with Support Structures in Gate Line Slits and Methods for Forming the Same
US 11,114,458
Cited by 12 later US patents, top 25% of utility patents granted in 2021 in our data. Protection runs to 2039.
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.
- 21 fees due Jan 4 to 25, 2027 · next Jan 4
- 28 fees due Feb 1 to 28, 2027 · next Feb 1
- 22 fees due Mar 5 to 26, 2027 · next Mar 5
- 23 fees due Apr 3 to 30, 2027 · next Apr 3
- 7 fees due May 7 to 28, 2027 · next May 7
- 18 fees due Jun 3 to 30, 2027 · next Jun 3
- 31 fees due Jul 2 to 30, 2027 · next Jul 2
- 19 fees due Aug 4 to 27, 2027 · next Aug 4
- 25 fees due Sep 3 to 30, 2027 · next Sep 3
- 22 fees due Oct 2 to 30, 2027 · next Oct 2
- 11 fees due Nov 5 to 12, 2027 · next Nov 5
Recent changes
- Nov 12Assignment recorded on 1 record: Qi, Wei and 8 others to Yangtze Memory Technologies Co., Ltd. Recorded Nov 12, 2026, executed Sep 2, 2024. Conveyance as recorded: Assignment of Assignor's Interest. A recorded assignment is a filed document, not a statement of current ownership. Reel 76727, frame 411.
- Oct 28Assignment recorded on 1 record: Cen, Yiqun and 2 others to Yangtze Memory Technologies Co., Ltd. Recorded Oct 28, 2026, executed Oct 11, 2023. Conveyance as recorded: Assignment of Assignor's Interest. A recorded assignment is a filed document, not a statement of current ownership. Reel 76543, frame 616.
- 105 of the patents on this record were granted since Aug 16, 2026
What they patent
The 5 largest of its 1,062 families, grouped by real patent family and labeled by the earliest filing in each. No technology classification is inferred from titles.
| Three-Dimensional Memory Devices and Fabrication Methods Thereof | 9 in force | to Sep 2039 |
| Methods for Forming Three-Dimensional Memory Device with Support Structure and Resulting Three-Dimensional Memory Device | 8 in force | to May 2040 |
| Three-Dimensional Memory Devices | 6 in force | to Mar 2041 |
| Three-Dimensional Memory Devices Having Through Array Contacts and Methods for Forming the Same | 6 in force | to Nov 2038 |
| Methods for Forming Three-Dimensional Memory Devices with Backside Source Contacts | 5 in force | to Jul 2042 |
Patents held now
Soonest term end first.
| Patent | Title | Status | Expires | Confidence |
|---|---|---|---|---|
| US 11,557,570 | Methods for Forming Three-Dimensional Memory Devices In force · High confidence | In force | High confidence | |
| US 12,255,181 | Methods for Forming Three-Dimensional Memory Devices In force · Low confidence | In force | Low confidence | |
| US 12,526,996 | Three-Dimensional Memory Devices In force · Medium confidence | In force | Medium confidence | |
| US 10,147,732 | Source Structure of Three-Dimensional Memory Device and Method for Forming the Same In force · High confidence | In force | High confidence | |
| US 10,423,176 | Low-Dropout Regulators In force · High confidence | In force | High confidence | |
| US 10,553,604 | Through Array Contact Structure of Three-Dimensional Memory Device In force · High confidence | In force | High confidence | |
| US 10,679,721 | Structure and Method for Testing Three-Dimensional Memory Device In force · High confidence | In force | High confidence | |
| US 10,727,245 | Trench Structures for Three-Dimensional Memory Devices In force · High confidence | In force | High confidence | |
| US 10,804,279 | Source Structure of Three-Dimensional Memory Device and Method for Forming the Same In force · Medium confidence | In force | Medium confidence | |
| US 10,804,283 | Openings Layout of Three-Dimensional Memory Device In force · High confidence | In force | High confidence |
Also on record, not counted in the 1,523: 4 patents in force now held by others · 1 patent ended · 932 applications pending · 59 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.
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.