11 patents currently held
6 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 Feb 2029. from the record
Of the 6 now held by other companies, 6 name H2C Safety Pipe Inc. as their current owner. Each row says so.
Free plan: 3 watched companies. Pro: unlimited.
Alerts on its grants, lapses and transfers.
3
Ending by 2030
Feb 2029
Next term end
3
Patent families
When these terms end
Held patents by the year their term ends
notable patents
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.
Notable patents
Ranked by citations and family size, against patents of the same kind granted the same year. How we rank
Notable
Ends Feb 2029 · High confidence
Also notable
Ends Aug 2040 · High confidence
Also notable
Ends Nov 2042 · High confidence
System, Method and Apparatus for Widespread Commercialization of Hydrogen as a Carbon-Free Alternative Fuel Source
US 8,336,810
The most cited patent in this portfolio, cited by 42 later US patents, top 25% of utility patents granted in 2012 in our data. Protection runs to 2029.
Method and Apparatus for Lighter-Than-Air Airship with Improved Structure and Delivery System
US 11,066,145
Cited by 6 later US patents, top 25% of utility patents granted in 2021 in our data. Protection runs to 2040.
Improved System, Method and Apparatus for Airship Manufacture Using Robotics
US 11,851,214
The newest of the three, granted 2023. It anchors the portfolio to 2042, later than anything else here.
Formerly held, still cited
Notable
Ends Nov 2040 · High confidence
Cited by 6 later US patents, top 25% of utility patents granted in 2022 in our data. Protection runs to 2040.
now held by H2C Safety Pipe, Inc.
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 May 21, 2027The maintenance fee for Method and Apparatus for Lighter-Than-Air Airship with Improved Structure and Delivery System (US 11,820,482) comes due May 21, 2027. Unpaid by Nov 22, 2027, it lapses early.
- 1 fee due Jun 26, 2027The maintenance fee for Improved System, Method and Apparatus for Airship Manufacture Using Robotics (US 11,851,214) comes due Jun 26, 2027. Unpaid by Dec 27, 2027, it lapses early.
Recent changes
- 2 of the patents on this record were granted since Aug 16, 2026
- 1 term has ended since Aug 16, 2026
What they patent
Grouped by real patent family, largest first, labeled by the earliest filing in each. No technology classification is inferred from titles.
Patents held now
Soonest term end first.
| Patent | Title | Status | Expires | Confidence |
|---|---|---|---|---|
| US 8,336,810 | System, Method and Apparatus for Widespread Commercialization of Hydrogen as a Carbon-Free Alternative Fuel Source In force · High confidence | In force | High confidence | |
| US 9,493,223 | System, Method and Apparatus for Widespread Commercialization of Hydrogen as a Carbon-Free Alternative Fuel Source In force · High confidence | In force | High confidence | |
| US 10,308,340 | System, method and apparatus for widespread commercialization of hydrogen as a carbon-free fuel source In force · Medium confidence | In force | Medium confidence | |
| US 11,066,145 | Method and Apparatus for Lighter-Than-Air Airship with Improved Structure and Delivery System In force · High confidence | In force | High confidence | |
| US 11,396,356 | Method and Apparatus for Lighter-Than-Air Airship with Improved Structure and Delivery System In force · Medium confidence | In force | Medium confidence | |
| US 11,820,482 | Method and Apparatus for Lighter-Than-Air Airship with Improved Structure and Delivery System In force · High confidence | In force | High confidence | |
| US 12,084,163 | Method and Apparatus for Lighter-Than-Air Airship with Improved Structure and Delivery System In force · High confidence | In force | High confidence | |
| US 12,534,174 | Method and Apparatus for Lighter-Than-Air Airship with Improved Structure and Delivery System In force · High confidence | In force | High confidence | |
| US 11,851,214 | Improved System, Method and Apparatus for Airship Manufacture Using Robotics In force · High confidence | In force | High confidence | |
| US 12,234,035 | Improved System, Method and Apparatus for Airship Manufacture Using Robotics In force · High confidence | In force | High confidence |
Also on record, not counted in the 11: 6 patents in force now held by others · 1 patent ended · 2 applications pending · 3 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.
Computed patent terms end on the dates shown. Related patents and pending applications may cover overlapping subject matter.