Patent US3704079A successfully refreshed from Google Patents.
US3704079A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Air compressors
Assignee: Individual
•
Filing: 1970-09-08
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Granted: 1972-11-28
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Expires: 1990-09-08
Abstract
Abstract An air compressor of the cylinder and reciprocating piston type comprises an inlet port formed in the wall of the cylinder so as to be uncovered by the piston near bottom dead center, and a spring-loaded annular discharge valve co-acting with two concentric seatings to close the upper end of the cylinder but which is engaged and lifted slightly by the piston at top dead center, the inner seating being formed on a valve guide embodying water injector means.
Inventors
- 👤 Martin John Berlyn
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-04 23:24
CPC Classifications
F; F04; F04B; F04B39/00; F04B39/06; F04B39/062; F04B39/0005; F04B39/10; F04B39/102; F04B39/1033; F04B7/00; F04B7/04
Claims Analysis
Total Claims: 7
Claim 1
Independent Claim
122 words
An air compressor comprising a cylinder, a piston reciprocable therein by crank and rod mechanism, an inlet port formed in the wall of said cylinder so as to be uncovered by said piston when near to bottom dead center, a valve guide member projecting downwards from the head of, and co-axial with, said cylinder, means disposed co-axially of said valve guide member for injecting water directly into said cylinder during the compression stroke, and an annular discharge valve urged by spring means into engagement with concentric seatings on the end of the wall of said cylinder and on said valve guide member respectively, the components being so dimensioned that at top dead center said piston makes contact with said annular discharge valve.
Claim 2
Dependent Claim
122 words
An air compressor comprising a cylinder, a piston reciprocable therein by crank and rod mechanism, an inlet port formed in the wall of said cylinder so as to be uncovered by said piston when near to bottom dead center, a valve guide member projecting downwards from the head of, and co-axial with, said cylinder, means disposed co-axially of said valve guide member for injecting water directly into said cylinder during the compression stroke, and an annular discharge valve urged by spring means into engagement with concentric seatings on the end of the wall of said cylinder and on said valve guide member respectively, the components being so dimensioned that at top dead center said piston makes contact with said annular discharge valve.
Claim 3
Dependent Claim
36 words
A compressor as claimed in claim 1, wherein at top dead center said piston lifts said annular discharge valve off said concentric seatings by an amount not exceeding 1 percent of the stroke of said piston.
Claim 4
Dependent Claim
28 words
An air compressor as claimed in claim 1, in which the inner diameter of said annular discharge valve is less than one-third of the bore of said cylinder.
Claim 5
Dependent Claim
79 words
An air compressor as claimed in claim 1, in which the seating on said valve guide member is formed on a flange at the lower end of said valve guide member, said annular discharge valve having a stepped or recessed inner edge portion engaging the flange on said valve guide member such that a flat-crowned piston at top dead center can engage said annular discharge valve whilst remaining slightly spaced from the lower face of said valve guide member.
Claim 6
Dependent Claim
48 words
An air compressor as claimed in claim 1, in which the seating on said valve guide member is formed on a flange at the lower end of said valve guide member, the crown of said piston being recessed centrally to clear said flange of said valve guide member.
Claim 7
Dependent Claim
28 words
An air compressor is claimed in claim 5, in which the diameter of said recess in the piston crown is less than 40 percent of the piston diameter.
References Cited (Backward Citations)
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USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1975-11-28 | 1976-05-29 | 1976-11-28 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1979-11-28 | 1980-05-29 | 1980-11-28 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1983-11-28 | 1984-05-29 | 1984-11-28 | $7700.00 | Window Closed / Lapsed |