78 patents currently held
22 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 Dec 2026. from the record
Of the 22 now held by other companies, 12 name Guardian Glass LLC as their current owner, and 10 more name another party. Each row says which.
Free plan: 3 watched companies. Pro: unlimited.
Alerts on its grants, lapses and transfers.
30
Ending by 2030
Dec 2026
Next term end
61
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 Jan 2031 · High confidence
Also notable
Ends Jan 2028 · High confidence
Also notable
Ends no later than Sep 2029 · Medium confidence
Resistive-Switching Nonvolatile Memory Elements
US 8,144,498
The most cited patent in this portfolio, cited by 101 later US patents, top 10% of utility patents granted in 2012 in our data. Protection runs to 2031.
Methods for Forming Nonvolatile Memory Elements with Resistive-Switching Metal Oxides
US 7,629,198
Cited by 98 later US patents, top 10% of utility patents granted in 2009 in our data, and renewed at 3 of 3 maintenance windows. Protection runs to 2028.
Methods for Forming Resistive Switching Memory Elements
US 7,972,897
Cited by 69 later US patents, top 10% of utility patents granted in 2011 in our data, and renewed at 3 of 3 maintenance windows. Protection runs to 2029. A terminal disclaimer is on file and its reference is not resolved, so no cap is applied and the date may move earlier, never later.
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 Dec 9 to 30, 2026 · next Dec 9
- 2 fees due Jan 21 to 30, 2027 · next Jan 21
- 3 fees due Feb 4 to 27, 2027 · next Feb 4
- 1 fee due Mar 8, 2027The maintenance fee for Embedded Nonvolatile Memory Elements Having Resistive Switching Characteristics (US 9,129,894) comes due Mar 8, 2027. Unpaid by Sep 8, 2027, it lapses early.
- 4 fees due May 3, 2027
- 4 fees due Jul 5 to 26, 2027 · next Jul 5
- 2 fees due Sep 1 to 3, 2027 · next Sep 1
- 1 fee due Oct 5, 2027The maintenance fee for High Productivity Combinatorial Workflow to Screen and Design Chalcogenide Materials as Non Volatile Memory Current Selector (US 9,305,791) comes due Oct 5, 2027. Unpaid by Apr 5, 2028, it lapses early.
Recent changes
- 3 terms have ended since Aug 16, 2026
What they patent
The 5 largest of its 61 families, grouped by real patent family and labeled by the earliest filing in each. No technology classification is inferred from titles.
| Resistive-Switching Nonvolatile Memory Elements | 6 in force | to Jan 2031 |
| Biploar Resistive-Switching Memory with a Single Diode per Memory Cell | 4 in force | to Aug 2030 |
| Non-Volatile Resistive-Switching Memories | 3 in force | to Oct 2028 |
| Current Compliance Layers and Memory Arrays Comprising Thereof | 2 in force | to Jan 2038 |
| Creating an Embedded ReRAM Memory from a High-K Metal Gate Transistor Structure | 2 in force | to Feb 2033 |
Patents held now
Soonest term end first.
| Patent | Title | Status | Expires | Confidence |
|---|---|---|---|---|
| US 7,544,574 | Methods for Discretized Processing of Regions of a Substrate In force · High confidence | In force | High confidence | |
| US 7,867,904 | Method and System for Isolated and Discretized Process Sequence Integration In force · High confidence | In force | High confidence | |
| US 7,749,881 | Formation of a Masking Layer on a Dielectric Region to Facilitate Formation of a Capping Layer on Electrically Conductive Regions Separated by the Dielectric Region In force · High confidence | In force | High confidence | |
| US 8,889,479 | Nonvolatile Memory Elements with Metal-Deficient Resistive-Switching Metal Oxides In force · Medium confidence | In force | Medium confidence | |
| US 7,629,198 | Methods for Forming Nonvolatile Memory Elements with Resistive-Switching Metal Oxides In force · High confidence | In force | High confidence | |
| US 8,599,603 | Resistive-Switching Nonvolatile Memory Elements In force · Medium confidence | In force | Medium confidence | |
| US 8,873,276 | Resistive-Switching Nonvolatile Memory Elements In force · Medium confidence | In force | Medium confidence | |
| US 9,030,862 | Resistive-Switching Nonvolatile Memory Elements In force · Medium confidence | In force | Medium confidence | |
| US 8,633,039 | Methods of Combinatorial Processing for Screening Multiple Samples on a Semiconductor Substrate In force · Medium confidence | In force | Medium confidence | |
| US 7,824,935 | Methods of Combinatorial Processing for Screening Multiple Samples on a Semiconductor Substrate In force · High confidence | In force | High confidence |
Also on record, not counted in the 78: 22 patents in force now held by others · 598 patents ended · 2 applications pending · 301 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.