Patents
US 12258952 B2: Leak-free, diffusion-blocking check valve, pump and method
- Granted
- 2025-03-25
- Filed
- 2023-02-10 application 18108384
- Type
- Utility · 14 claims
- Elsewhere
- Google Patents ↗ · USPTO patent document ↗ · USPTO Patent Center record ↗
Abstract
A closed leak-free, diffusion-blocking one-way check valve is composed of a substrate having a flow passage through the substrate, the flow passage has a sealing surface between the substrate and a membrane preventing flow through the flow passage. A thin film having internal stress is disposed on the membrane which induces deformation of the membrane biasing the membrane resulting in the sealing surface in a closed orientation. A method for fabrication and pump utilizing the check valve are disclosed.
Source: PVGPATDIS, file of 2026-04-10 (ipg250325.xml).
Assignees
| Assignee | Type | Place | Also on furp.org | Source |
|---|---|---|---|---|
| Rochester Institute of Technology 110 patents | US company or organization | Rochester, NY | Rochester Institute of Technology College or university EXACT high confidence: identical full name and state ROCHESTER INSTITUTE OF TECHNOLOGY Nonprofit EXACT high confidence: identical full name and state | PVGPATDIS, file of 2026-04-10 |
Inventors
| Inventor | Place | Patents | Person page | Source |
|---|---|---|---|---|
| David A. Borkholder | Canandaigua, NY | 24 | PVGPATDIS, file of 2026-04-10 | |
| Farzad Forouzandeh | Pacifica, CA | 4 | PVGPATDIS, file of 2026-04-10 |
CPC categories
| Subclass | Category | First group | Source |
|---|---|---|---|
| F04B | Positive-displacement machines for liquids; pumps | F04B43/043 | PVGPATDIS, file of 2026-04-10 |
| F16K | Valves; taps; cocks; actuating-floats; devices for venting or aerating | F16K15/1441 | PVGPATDIS, file of 2026-04-10 |
Cooperative Patent Classification, as currently assigned (one row per subclass).
Assignments and security interests
| Recorded | What | From | To | Reel/frame | Source |
|---|---|---|---|---|---|
| 2023-06-06 | Assignment Assignment of assignor's interest | FOROUZANDEH, FARZAD signed 2023-05-05 BORKHOLDER, DAVID signed 2023-05-25 | ROCHESTER INSTITUTE OF TECHNOLOGY ROCHESTER, NY | 63861/727 | ECORSEXC, file of 2026-09-25 |
Documents recorded with the USPTO Assignment Recordation Branch that list this patent. A security interest is a lender’s claim on the patent as collateral; a release ends it.
USPTO bulk data: PatentsView granted patents, disambiguated (PVGPATDIS) for patents, assignees, inventors, places and CPC categories; the USPTO Patent Assignment Dataset (ECORSEXC) for assignments and security interests. Patents filed in the last 20 years. No claims or full text. Links to other records are by name (and state): EXACT means the identical full name and state; FUZZY means a looser name match, with the confidence shown.