Patent US720877A successfully refreshed from Google Patents.
US3606318A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Fluid resistant type exercising device
Assignee: Individual
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Filing: 1969-07-03
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Granted: 1971-09-20
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Expires: 1989-07-03
Abstract
Abstract A FLUID CONTROL APPARATUS COMPRISING A PAIR OF FLUID CHAMBERS IN FLUID COMMUNICATION WITH EACH OTHER AND INCLUDING PISTONS FOR MOVING THE LIQUID FROM ONE CHAMBER TO THE OTHER THROUGH RESTRICTED VALVE OPENINGS, THE SIZE OF THE VALVE OPENING BEING DEPENDENT UPON THE MAGNITUDE OF AN EXTERNAL FORCE APPLIED TO THE PISTONS. AN ADJUSTING DEVICE SETS THE AMOUNT OF THE FLUID FORCE REQUIRED TO OPEN THE VALVE. THE PISTONS ARE CONNECTED TO A MANUALLY MOVABLE CROSS BAR. THE RATE OF MOVEMENT OF THIS CROSS-BAR IS DEPENDENT UPON THE FORCE EXERTED BY THE EXERCISER ON THE BAR.
Inventors
- 👤 James B Gilstrap
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-26 14:35
CPC Classifications
A; A63; A63B; A63B21/00; A63B21/15; A63B21/151; A63B21/154; A63B21/008; A63B21/0083
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
No citation records indexed.
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1974-09-19 | 1975-03-21 | 1975-09-20 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1978-09-19 | 1979-03-21 | 1979-09-20 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1982-09-19 | 1983-03-21 | 1983-09-20 | $7700.00 | Window Closed / Lapsed |