US4659520A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Air injector
Assignee: Individual
•
Filing: 1986-02-20
•
Granted: 1987-04-21
•
Expires: 2006-02-20
Abstract
Abstract This is a device for injecting air into a water supply under pressure in a closed system. One embodiment consists of two sliding pistons inside a closed housing. The two pistons are connected to each other by a connecting rod. They are positioned so that they slide alternately toward one end of said housing and then toward the other end. They are propelled first in one direction and then the other by water entering under pressure alternately through two openings, one on each side of the driving piston and exiting alternately through two other openings on opposite sides of said driving piston. These valves are opened and closed alternately in pairs by a means driven by the movement of said pistons. The second piston, driven by the first, draws air into said housing as it moves in one direction and then forces it into the water as it moves in the other direction.
Inventors
- 👤 Stephen C. Tarver
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-04 20:38
CPC Classifications
B; B01; B01F; B01F25/00; B01F25/30; B01F25/31
Claims Analysis
Total Claims: 4
Claim 1
Independent Claim
149 words
A device to inject air into water under pressure comprising: An enclosed elongated housing around two pistons connected to each other by a connecting rod, and positioned to slide alternately toward one end of said housing and then toward the other, said pistons being propelled back and forth by water under pressure entering alternately through two openings, one on each side of the driving piston, and alternately exiting through two openings on the opposite sides of said driving, and further including a means to alternately open and close said openings in pairs, said means being activated by movement of said pistons, and also a check valve mounted in the other piston to allow air to pass through it in one direction but not the other and further including a check valve mounted in said housing to allow air to enter said housing above said other piston from the outside.
Claim 2
Independent Claim
149 words
A device to inject air into water under pressure comprising: An enclosed elongated housing around two pistons connected to each other by a connecting rod, and positioned to slide alternately toward one end of said housing and then toward the other, said pistons being propelled back and forth by water under pressure entering alternately through two openings, one on each side of the driving piston, and alternately exiting through two openings on the opposite sides of said driving, and further including a means to alternately open and close said openings in pairs, said means being activated by movement of said pistons, and also a check valve mounted in the other piston to allow air to pass through it in one direction but not the other and further including a check valve mounted in said housing to allow air to enter said housing above said other piston from the outside.
Claim 3
Independent Claim
139 words
A device to inject air into water under pressure comprising: An enclosed elongated housing around two pistons connected to each other by a connecting rod, and positioned to slide alternately toward one end of said housing and then toward the other, said pistons being propelled back and forth by water under pressure entering alternately through two openings, one on each side of the driving piston, and alternately exiting through two openings on the opposite sides of said driving piston, and further including a means to alternately open and close said openings in pairs, said means being activated by movement of said pistons, and also including a check valve in said housing to allow air to enter above said other piston from the outside and another check valve to allow air to leave said housing from above said other piston.
Claim 4
Independent Claim
139 words
A device to inject air into water under pressure comprising: An enclosed elongated housing around two pistons connected to each other by a connecting rod, and positioned to slide alternately toward one end of said housing and then toward the other, said pistons being propelled back and forth by water under pressure entering alternately through two openings, one on each side of the driving piston, and alternately exiting through two openings on the opposite sides of said driving piston, and further including a means to alternately open and close said openings in pairs, said means being activated by movement of said pistons, and also including a check valve in said housing to allow air to enter above said other piston from the outside and another check valve to allow air to leave said housing from above said other piston.
References Cited (Backward Citations)
US417664A
Cited
GB190919207A
Cited
US980447A
Cited
US2359991A
Cited
US2604310A
Cited
US3226099A
Cited
US3381699A
Cited
US3412741A
Cited
US3646960A
Cited
US3763878A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1990-04-20 | 1990-10-20 | 1991-04-21 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1994-04-20 | 1994-10-20 | 1995-04-21 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1998-04-20 | 1998-10-20 | 1999-04-21 | $7700.00 | Window Closed / Lapsed |