93 patents currently held
24 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.
60 more records may belong here and await a decision; they are not counted.
The next term ends in Jan 2027. from the record
Of the 24 now held by other companies, 23 name Alter Domus US LLC as Agent for the Secured Parties as their current owner, and 1 more name another party. Each row says which.
Free plan: 3 watched companies. Pro: unlimited.
Alerts on its grants, lapses and transfers.
15
Ending by 2030
Jan 2027
Next term end
87
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 Feb 2028 · High confidence
Also notable
Ends Apr 2028 · High confidence
Also notable
Ends May 2035 · High confidence
Methods and Systems for Vectored Data De-Duplication
US 8,332,616
Cited by 25 later US patents, top 25% of utility patents granted in 2012 in our data, and renewed at 3 of 3 maintenance windows. Protection runs to 2028. A terminal disclaimer caps this term to an earlier patent's.
Methods, Systems and Apparatus for Reducing the Effects of Tape Dimensional Stability
US 7,738,212
Renewed at every maintenance window since the 2010 grant; no more fees are due before its term ends in 2028.
DYNAMICALLY VARIABLE ERROR CORRECTING CODE (ECC) SYSTEM WITH HYBRID RATELESS REED-SOLOMON ECCs
US 11,398,836
Granted 2022. Computed term ends 2035. A terminal disclaimer caps this term to an earlier patent's.
Formerly held, still cited
Notable
Ends Feb 2035 · High confidence
Cited by 15 later US patents, top 25% of utility patents granted in 2016 in our data, and renewed at every maintenance window due so far. Protection runs to 2035.
now held by Quantum Corportaion
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.
- 5 fees due Nov 23 to 30, 2026 · next Nov 23
- 4 fees due Dec 13 to 27, 2026 · next Dec 13
- 4 fees due Feb 8 to 28, 2027 · next Feb 8
- 3 fees due Apr 6 to 29, 2027 · next Apr 6
- 3 fees due May 12 to 26, 2027 · next May 12
- 1 fee due Jun 3, 2027The maintenance fee for Sequential Access Storage and Data De-Duplication (US 10,496,523) comes due Jun 3, 2027. Unpaid by Dec 3, 2027, it lapses early.
- 1 fee due Jul 28, 2027The maintenance fee for Recursive Multi-Threaded File System Scanner For Serializing File System Metadata Exoskeleton (US 10,545,915) comes due Jul 28, 2027. Unpaid by Jan 28, 2028, it lapses early.
- 2 fees due Aug 4 to 11, 2027 · next Aug 4
- 2 fees due Sep 12 to 30, 2027 · next Sep 12
- 1 fee due Oct 16, 2027The maintenance fee for System and Method for Writing Data to Tape and Reading Data from Tape Using a Restful Interface (US 11,961,541) comes due Oct 16, 2027. Unpaid by Apr 17, 2028, it lapses early.
Recent changes
- 3 of the patents on this record were granted since Aug 16, 2026
- 3 terms have ended since Aug 16, 2026
What they patent
The 5 largest of its 87 families, grouped by real patent family and labeled by the earliest filing in each. No technology classification is inferred from titles.
| System and Method for Evaluating the Internal State of a Media Library | 2 in force | to May 2040 |
| Removable Media Based Object Store | 2 in force | to Jul 2037 |
| Cloud-Based Solid State Device (SSD) with Dynamically Variable Error Correcting Code (ECC) System | 2 in force | to May 2035 |
| Sequential Access Storage and Data De-Duplication | 2 in force | to Dec 2034 |
| Heuristic Journal Reservations | 2 in force | to Aug 2034 |
Patents held now
Soonest term end first.
| Patent | Title | Status | Expires | Confidence |
|---|---|---|---|---|
| US 7,624,328 | Data Error Detection During Media Write In force · High confidence | In force | High confidence | |
| US 7,600,059 | Multiple Lun Support for Sata Devices In force · High confidence | In force | High confidence | |
| US 8,209,508 | Methods and Systems for Improving Read Performance in Data De-Duplication Storage In force · High confidence | In force | High confidence | |
| US 8,332,616 | Methods and Systems for Vectored Data De-Duplication In force · High confidence | In force | High confidence | |
| US 7,583,463 | Intelligent Tape Drive Assembly That Diagnoses and Repairs Its Own Tape Drives In force · High confidence | In force | High confidence | |
| US 8,326,884 | Data Storage System In force · Low confidence | In force | Low confidence | |
| US 7,738,212 | Methods, Systems and Apparatus for Reducing the Effects of Tape Dimensional Stability In force · High confidence | In force | High confidence | |
| US 7,684,144 | Multi-Rate Tracking with a Multi-Actuator Servo Control In force · High confidence | In force | High confidence | |
| US 7,755,863 | Adjacent Track Readers In force · High confidence | In force | High confidence | |
| US 7,826,169 | Servo Error Detection and Compensation Utilizing Virtual Data Tracking Servo Methods In force · High confidence | In force | High confidence |
Also on record, not counted in the 93: 24 patents in force now held by others · 447 patents ended · 6 applications pending · 108 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.