Patent US4238992A successfully refreshed from Google Patents.
US4238992A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Pump diaphragm
Assignee: PSG California LLC
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Filing: 1978-10-30
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Granted: 1980-12-16
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Expires: 1998-10-30
Abstract
Abstract A diaphragm configuration is disclosed for an air-driven pump. The diaphragm includes concentric ribs on the pressure side of the flexure portion thereof. This has been found to extend the life of diaphragms made of relatively brittle materials such as synthetic resin polymers.
Inventors
- 👤 Alan D. Tuck, Jr.
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-07 05:21
CPC Classifications
F; F16; F16J; F16J3/00; F16J3/02; F04; F04B; F04B43/00; F04B43/0009; F04B43/0054; B; B29; B29L; B29L2031/00; B29L2031/755
Claims Analysis
Total Claims: 7
Claim 1
Independent Claim
73 words
A diaphragm including an inner attachment portion, an outer attachment portion and a sheet-like, annular flexure portion made of a synthetic resin polymer bounded by said inner and outer attachment portions and having a concaved, fluid pressure receiving side, wherein the improvement comprises concentric, continuous ribs spaced substantially uniformly across the width of said fluid pressure receiving side of said flexure portion such that said surface is substantially sinusoidal in a radial direction.
Claim 2
Dependent Claim
73 words
A diaphragm including an inner attachment portion, an outer attachment portion and a sheet-like, annular flexure portion made of a synthetic resin polymer bounded by said inner and outer attachment portions and having a concaved, fluid pressure receiving side, wherein the improvement comprises concentric, continuous ribs spaced substantially uniformly across the width of said fluid pressure receiving side of said flexure portion such that said surface is substantially sinusoidal in a radial direction.
Claim 3
Dependent Claim
15 words
The diaphragm of claim 1 wherein said ribs are integrally formed with said flexure portion.
Claim 4
Dependent Claim
65 words
A diaphragm including an inner attachment portion, an outer attachment portion, and a sheet like annular flexure portion bounded by said inner and outer attachment portions and having a concaved, fluid pressure receiving side, wherein the improvement comprises concentric continuous ribs spaced substantially uniformly across the width of said pressure receiving side of said flexure portion and said flexure portion is a synthetic resin polymer.
Claim 5
Dependent Claim
65 words
A diaphragm including an inner attachment portion, an outer attachment portion, and a sheet like annular flexure portion bounded by said inner and outer attachment portions and having a concaved, fluid pressure receiving side, wherein the improvement comprises concentric continuous ribs spaced substantially uniformly across the width of said pressure receiving side of said flexure portion and said flexure portion is a synthetic resin polymer.
Claim 6
Dependent Claim
96 words
A diaphragm for an air driven diaphragm pump including an inner attachment portion, an outer attachment portion and a sheet like, annular flexure portion bounded by said inner and said outer attachment portions and having a concaved, air pressure receiving side and a convex working side, wherein the improvement comprises said air pressure receiving side having a plurality of concentric continuous ribs forming a substantially sinusoidal surface in a radial direction, said surface being substantially identical in all radial directions thereof, said convex working side being smooth, and said flexure portion being a synthetic resin polymer.
Claim 7
Dependent Claim
96 words
A diaphragm for an air driven diaphragm pump including an inner attachment portion, an outer attachment portion and a sheet like, annular flexure portion bounded by said inner and said outer attachment portions and having a concaved, air pressure receiving side and a convex working side, wherein the improvement comprises said air pressure receiving side having a plurality of concentric continuous ribs forming a substantially sinusoidal surface in a radial direction, said surface being substantially identical in all radial directions thereof, said convex working side being smooth, and said flexure portion being a synthetic resin polymer.
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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) | 1983-12-16 | 1984-06-16 | 1984-12-16 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1987-12-16 | 1988-06-16 | 1988-12-16 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1991-12-16 | 1992-06-16 | 1992-12-16 | $7700.00 | Window Closed / Lapsed |