The Patent Finder
HG

Hitachi Global Storage Technologies

First filing 2003
OverviewNotableFeesChangesPatent listSources & methods

0 patents currently held, every record listed here

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 more records may belong here and await a decision; they are not counted.

This portfolio holds none of the 4 US patents in force on its record. from the record

Of the 4 now held by other companies, 4 name Western Digital Technologies Inc. as their current owner. Each row says so.

Free plan: 3 watched companies. Pro: unlimited.
Alerts on its grants, lapses and transfers.
0
Ending by 2030
none
Next term end

When these terms end

Each bar runs from grant to computed term end. 2010 to 2030.
US 7,839,605 Electrical Signal-Processing Device Integrating a Flux Sensor with a Flux Generator in a Magnetic Circuit Mar 7, 2029
US 7,787,219 In a Disk Drive Apparatus Having a Diverter for Providing Streamlined Contour and Reduced Axial Flow at the Actuator Attachment Interface Between a Flexible Cable and Flexure Jun 30, 2029
US 7,907,365 Apparatus for Controlling and Sealing Airflow Around Disk Drive Bypass Walls Dec 8, 2029
US 8,203,805 Abs with Lubricant Control Trenches for Hard Disk Drives Nov 19, 2030
20142018202220262030
Every computed term in this portfolio is shown above.Updated Nov 15, 2026 · includes USPTO assignment & status data published Nov 15, 2026 and grant & fee data published Nov 10, 2026 (weekly) · how we know

Notable patents

Ranked by citations and family size, against patents of the same kind granted the same year. How we rank
None of the currently held patents qualifies as notable.

Formerly held, still cited

Notable
The most cited patent in this portfolio, cited by 74 later US patents, top 10% of utility patents granted in 2010 in our data. Protection runs to 2029.
Ends Mar 2029 · High confidence
Also notable
Renewed at every maintenance window since the 2012 grant; no more fees are due before its term ends in 2030.
Ends Nov 2030 · High confidence
Also notable Ends Jun 2029 · High confidence

Fee deadlines

No maintenance fee falls due on this company's record before Nov 10, 2027.

Recent changes

Nothing was recorded against this company's patents in the last 90 days.

Patents held now

Soonest term end first.
Also on record: 4 patents in force now held by others · 25 patents ended · 1 application 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.
Computed patent terms end on the dates shown. Related patents and pending applications may cover overlapping subject matter.
The Patent Finder CompaniesExpirationsCalculatorWatchlistPricing MethodologyCorrectionsLegalPrivacysupport@thepatentfinder.com Updated Nov 15, 2026 · includes USPTO assignment & status data published Nov 15, 2026 and grant & fee data published Nov 10, 2026 (weekly) Part of 137 Finder · © 2026 137 Finder LLC · Sources cited