Patents
US 8267666 B2: Air flow control apparatus
- Granted
- 2012-09-18
- Filed
- 2010-03-09 application 12719898
- Type
- Utility · 18 claims
- Elsewhere
- Google Patents ↗ · USPTO patent document ↗ · USPTO Patent Center record ↗
Abstract
An apparatus includes a valve housing having an inlet port, a first chamber with a first outlet port, and a second chamber with a second outlet port. A first valve opens between the inlet port and the first chamber under a first level of pneumatic pressure at the inlet port. A second valve opens between the first chamber and the second chamber under a second, greater level of pneumatic pressure in the first chamber. A third valve opens between the second chamber and the first chamber under a third level of pneumatic pressure in the second chamber, with the third level being less than the first level.
Source: PVGPATDIS, file of 2026-04-10 (ipg120918.xml).
Assignees
| Assignee | Type | Place | Also on furp.org | Source |
|---|---|---|---|---|
| Campbell Hausfeld / Scott Fetzer Company 25 patents | US company or organization | Cadiz, OH | PVGPATDIS, file of 2026-04-10 |
Inventors
| Inventor | Place | Patents | Person page | Source |
|---|---|---|---|---|
| Christopher Gruber | Cincinnati, OH | 4 | PVGPATDIS, file of 2026-04-10 | |
| David O. Shumate | Lawrenceburg, IN | 3 | PVGPATDIS, file of 2026-04-10 | |
| James W. Happe, Jr. | Cincinnati, OH | 1 | PVGPATDIS, file of 2026-04-10 | |
| Steven Salmons | Saint Louis, MO | 2 | PVGPATDIS, file of 2026-04-10 | |
| Jeffrey P. VanHorn | Saint Louis, MO | 3 | PVGPATDIS, file of 2026-04-10 |
CPC categories
| Subclass | Category | First group | Source |
|---|---|---|---|
| F04B | Positive-displacement machines for liquids; pumps | F04B49/24 | PVGPATDIS, file of 2026-04-10 |
| F16K | Valves; taps; cocks; actuating-floats; devices for venting or aerating | F16K15/066 | PVGPATDIS, file of 2026-04-10 |
| Y10T | Technical subjects covered by former us classification | Y10T137/2557 | 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 |
|---|---|---|---|---|---|
| 2020-10-19 | Assignment Assignment of assignor's interest | CAMPBELL HAUSFELD, LLC signed 2020-10-13 | MAT INDUSTRIES, LLC LONG GROVE, IL | 54113/397 | ECORSEXC, file of 2026-09-25 |
| 2017-10-17 | Correction Conversion | CAMPBELL HAUSFELD/SCOTT FETZER COMPANY signed 2014-12-23 | CAMPBELL HAUSFELD, LLC HARRISON, OH | 44218/273 | ECORSEXC, file of 2026-09-25 |
| 2010-03-09 | Assignment Assignment of assignor's interest | CONTROL DEVICES LLC signed 2010-02-26 | CAMPBELL HAUSFELD/SCOTT FETZER COMPANY HARRISON, OH | 24048/354 | ECORSEXC, file of 2026-09-25 |
| 2010-03-09 | Assignment Assignment of assignor's interest | VANHORN, JEFFREY P. signed 2010-02-04 SALMONS, STEVEN R. signed 2010-02-05 | CONTROL DEVICES LLC ST. LOUIS, MO | 24048/334 | ECORSEXC, file of 2026-09-25 |
| 2010-03-09 | Assignment Assignment of assignor's interest | HAPPE, JR., JAMES W. signed 2010-02-01 GRUBER, CHRISTOPHER signed 2010-02-02 SHUMATE, DAVID O. signed 2010-02-02 | CAMPBELL HAUSFELD/SCOTT FETZER COMPANY HARRISON, OH | 24048/290 | 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.