Patent US4012173A successfully refreshed from Google Patents.
US4012173A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Variable stroke compressor
Assignee: Individual
•
Filing: 1976-01-26
•
Granted: 1977-03-15
•
Expires: 1996-01-26
Abstract
Abstract A variable stroke compressor is disclosed that includes a casing with an upper and lower piston, the lower piston being connected to a piston rod and the upper piston being slidably received for reciprocal movement on the piston rod. Means are provided on the upper piston to control its descent towards the lower piston.
Inventors
- 👤 Kirke B. Everson, Jr.
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 17:32
CPC Classifications
F; F04; F04B; F04B3/00; F03; F03B; F03B13/00; F03B13/12; F03B13/14; F03B13/16; F03B13/18; F03B13/1845; F03B13/187; F04B39/00; F04B39/0005; F04B39/0016; F04B9/00; F04B9/02; Y; Y02; Y02E; Y02E10/00; Y02E10/30
Claims Analysis
Total Claims: 5
Claim 1
Independent Claim
106 words
A compressor comprising a casing with substantially closed upper and lower ends, an inlet port adjacent the lower end and an outlet port adjacent the upper end, a piston rod passing through the upper end, a packing sealing the rod and upper end yet permitting reciprocation thereof, a lower piston coupled to the piston rod, an upper piston slidably disposed on the rod, check valves in the upper and lower pistons permitting upward flow, means acting on the upper piston to retard reciprocable downward movement thereof in said casing, said piston rod coupled to a source of energy to reciprocate the rod and said lower piston.
Claim 2
Dependent Claim
106 words
A compressor comprising a casing with substantially closed upper and lower ends, an inlet port adjacent the lower end and an outlet port adjacent the upper end, a piston rod passing through the upper end, a packing sealing the rod and upper end yet permitting reciprocation thereof, a lower piston coupled to the piston rod, an upper piston slidably disposed on the rod, check valves in the upper and lower pistons permitting upward flow, means acting on the upper piston to retard reciprocable downward movement thereof in said casing, said piston rod coupled to a source of energy to reciprocate the rod and said lower piston.
Claim 3
Dependent Claim
22 words
A compressor as in claim 1 wherein the means to retard downward movement comprises a friction wheel mounted on said upper piston.
Claim 4
Dependent Claim
44 words
A compressor as in claim 2 wherein said friction wheel is mounted on a pivoting arm and the wheel is urged normally against the inner wall of the casing, and including means to release engagement of the wheel upon approach of the lower piston.
Claim 5
Dependent Claim
31 words
A compressor as in claim 1 wherein the means to retard downward movement comprises a hydraulic piston coupled to the upper piston, said piston having controlled leakage of hydraulic fluid therethrough.
References Cited (Backward Citations)
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1980-03-14 | 1980-09-13 | 1981-03-15 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1984-03-14 | 1984-09-13 | 1985-03-15 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1988-03-14 | 1988-09-13 | 1989-03-15 | $7700.00 | Window Closed / Lapsed |