17 patents currently held
Held is read from USPTO's recorded assignments; a transfer never recorded there does not appear.
6 more records may belong here and await a decision; they are not counted.
The next term ends in Mar 2028. from the record
Free plan: 3 watched companies. Pro: unlimited.
Alerts on its grants, lapses and transfers.
2
Ending by 2030
Mar 2028
Next term end
14
Patent families
When these terms end
Held patents by the year their term ends
notable patents
all others
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: 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 Nov 2031 · High confidence
Also notable
Ends Sep 2033 · High confidence
Also notable
Ends Feb 2032 · High confidence
Bearing Support System for Free-Piston Stirling Machines
US 8,615,993
Cited by 28 later US patents, top 25% of utility patents granted in 2013 in our data, and renewed at 3 of 3 maintenance windows. Protection runs to 2031.
Energy Efficient Biological Freezer With Vial Management System
US 9,587,873
Granted 2017 and renewed at every maintenance window due so far. Protection runs to 2033.
Free-Piston Stirling Machine In An Opposed Piston Gamma Configuration Having Improved Stability, Efficiency And Control
US 8,752,375
Renewed at every maintenance window since the 2014 grant; no more fees are due before its term ends in 2032.
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 Jul 28, 2027The maintenance fee for Energy Efficient Biological Freezer with Vial Management System (US 10,544,978) comes due Jul 28, 2027. Unpaid by Jan 28, 2028, it lapses early.
- 1 fee due Sep 5, 2027The maintenance fee for Micro-Channel Pulsating Heat Pipe (US 11,920,868) comes due Sep 5, 2027. Unpaid by Mar 6, 2028, it lapses early.
- 1 fee due Nov 7, 2027The maintenance fee for Dynamic Frequency Tuning For Driving A Free-Piston Gamma-Type Stirling Heat-Pump At Minimum Electrical Power Input Or Maximum Thermal Cooling Power Depending Upon Current Thermal Conditions (US 11,976,864) comes due Nov 7, 2027. Unpaid by May 8, 2028, it lapses early.
Recent changes
Nothing was recorded against this company's patents in the last 90 days.
What they patent
The 5 largest of its 14 families, grouped by real patent family and labeled by the earliest filing in each. No technology classification is inferred from titles.
| Energy Efficient Biological Freezer With Vial Management System | 3 in force | to Nov 2033 |
| Micro-Channel Pulsating Heat Pipe | 2 in force | to Dec 2040 |
| Method for Improving Gas Bearing Function at Low Thermal Cooling Power | 1 in force | to Feb 2043 |
| Method For and Control System With Piston Amplitude Recovery for Free-Piston Machines | 1 in force | to Mar 2041 |
| Independent Auxiliary Thermosiphon For Inexpensively Extending Active Cooling To Additional Freezer Interior Walls | 1 in force | to Feb 2038 |
Patents held now
Soonest term end first.
| Patent | Title | Status | Expires | Confidence |
|---|---|---|---|---|
| US 7,692,339 | Stirling Cycle Engine held by Global Cooling B.V. and Twinbird Corporation In force · High confidence | In force | High confidence | |
| US 8,011,183 | Resonant Stator Balancing of Free Piston Machine Coupled to Linear Motor or Alternator held by Global Cooling B.V. In force · High confidence | In force | High confidence | |
| US 8,615,993 | Bearing Support System for Free-Piston Stirling Machines In force · High confidence | In force | High confidence | |
| US 8,713,934 | Lubricant Free, Reduced Mass, Free-Piston, Stirling Machine Having Reciprocating Piston Drivingly Linked to Rotary Electromagnetic Transducer Moving in Rotational Oscillation In force · High confidence | In force | High confidence | |
| US 8,752,375 | Free-Piston Stirling Machine In An Opposed Piston Gamma Configuration Having Improved Stability, Efficiency And Control In force · High confidence | In force | High confidence | |
| US 8,671,677 | Gamma Type Free-Piston Stirling Machine Configuration In force · High confidence | In force | High confidence | |
| US 8,952,635 | Method For Use In Controlling Free Piston Stirling Coolers And Heat Pumps Driven By A Linear Alternator In force · High confidence | In force | High confidence | |
| US 10,544,978 | Energy Efficient Biological Freezer with Vial Management System In force · High confidence | In force | High confidence | |
| US 9,587,873 | Energy Efficient Biological Freezer With Vial Management System In force · High confidence | In force | High confidence | |
| US 10,775,091 | Energy Efficient Biological Freezer with Vial Management System In force · Medium confidence | In force | Medium confidence |
Also on record, not counted in the 17: 8 patents ended · 6 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.