Patent US3885554A successfully refreshed from Google Patents.
US3885554A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Apparatus for generating pulses of fluid pressure
Assignee: USM Corp
•
Filing: 1972-12-08
•
Granted: 1975-05-27
•
Expires: 1992-12-08
Abstract
Abstract Apparatus for supplying pulses of fluid pressure to a chamber has means for supplying pressurized fluid to the chamber and means responsive to the pressure of the fluid in the chamber for controlling the supply means to provide pulses of pressure fluid. Additional means for sequentially selecting one of a plurality of such chambers to be supplied with pressure are provided in a preferred embodiment and the control, selecting and sequencing means are fluidic elements.
Inventors
- 👤 Jr Adelbert W Rockwell
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-02 14:22
CPC Classifications
A; A61; A61H; A61H9/00; A61H9/005; A61H9/0078; A61H2201/00; A61H2201/50; A61H2201/5056; Y; Y10; Y10S; Y10S128/00; Y10S128/10
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
166 words
Apparatus for sequentially supplying fluid pressure to a system of more than two bladders according to a predetermined sequence, said bladders being adapted to apply external pressure to portions of the human body comprising: A. A source of pressurized fluid connected to each bladder; B. A valve connected to each bladder for controlling the flow of pressurized fluid thereto; C. Means in each bladder for sensing the pressure therein; D. A selector for generating fluid pressure signals for actuating the pressure control valves of the bladders according to the predetermined sequence; E. Means to receive the pressure from the pressure sensors, compare said pressure with a predetermined value, and generate a fluid pressure signal when a predetermined relation between said pressures exists; F. Means responsive to the fluid pressure signals from the selector and the pressure comparator to sequentially actuate the valves to inflate and deflate the bladders; and G. Timing means associated with the pressure comparator to control the overall cycling time of each bladder.
Claim 2
Dependent Claim
166 words
Apparatus for sequentially supplying fluid pressure to a system of more than two bladders according to a predetermined sequence, said bladders being adapted to apply external pressure to portions of the human body comprising: A. A source of pressurized fluid connected to each bladder; B. A valve connected to each bladder for controlling the flow of pressurized fluid thereto; C. Means in each bladder for sensing the pressure therein; D. A selector for generating fluid pressure signals for actuating the pressure control valves of the bladders according to the predetermined sequence; E. Means to receive the pressure from the pressure sensors, compare said pressure with a predetermined value, and generate a fluid pressure signal when a predetermined relation between said pressures exists; F. Means responsive to the fluid pressure signals from the selector and the pressure comparator to sequentially actuate the valves to inflate and deflate the bladders; and G. Timing means associated with the pressure comparator to control the overall cycling time of each bladder.
References Cited (Backward Citations)
US2071215A
Cited
US3052238A
Cited
US3182335A
Cited
US3288132A
Cited
US3390674A
Cited
US3494357A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1978-05-26 | 1978-11-25 | 1979-05-27 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1982-05-26 | 1982-11-25 | 1983-05-27 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1986-05-26 | 1986-11-25 | 1987-05-27 | $7700.00 | Window Closed / Lapsed |