US4438935A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Fluid seals
Assignee: JC Ludowici and Son Ltd
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Filing: 1982-07-20
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Granted: 1984-03-27
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Expires: 2002-07-20
Abstract
Abstract A homogeneous self energizing seal comprising an annular member having side walls, a top and a bottom forming the trunk of the seal, the side walls are provided with chamfered upper portions the upper edges of which merges into flat portions on the top of the seal, the bottom edges of the chamfered portions forming the sealing lips of the seal. The flat portions on the top of the seal merge into annular slots or troughs in the top of the seal which has a raised center portion upstanding therefrom.
Inventors
- 👤 Geoffrey C. Lees
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-07 10:25
CPC Classifications
F; F16; F16J; F16J15/00; F16J15/16; F16J15/18; F16J15/20; F16J15/32; F16J15/3204; F16J15/3232; F16J15/3236
Claims Analysis
Total Claims: 10
Claim 1
Independent Claim
89 words
A homogeneous self-energising seal comprising an annular member having side walls, a top and a bottom forming the trunk of the seal, the side walls having top chamfered portions, the upper edges of which merge into flat portions on the top of the seal, the bottom edges of said chamfered portions forming the sealing lips of the seal, the flat portions merging into spaced annular slots or troughs in the top of the seal which are separated by a raised centre portion upstanding from the top of the seal.
Claim 2
Dependent Claim
89 words
A homogeneous self-energising seal comprising an annular member having side walls, a top and a bottom forming the trunk of the seal, the side walls having top chamfered portions, the upper edges of which merge into flat portions on the top of the seal, the bottom edges of said chamfered portions forming the sealing lips of the seal, the flat portions merging into spaced annular slots or troughs in the top of the seal which are separated by a raised centre portion upstanding from the top of the seal.
Claim 3
Dependent Claim
21 words
A homogeneous self energising seal as claimed in claim 1 wherein said slots or troughs are "V" shaped in cross section.
Claim 4
Dependent Claim
21 words
A homogeneous self energising seal as claimed in claims 1 or 2 wherein said raised centre portion is semi-circular in cross-section.
Claim 5
Dependent Claim
20 words
A homogeneous self energising seal as claimed in claim 1 wherein the trunk of the seal has parallel side walls.
Claim 6
Dependent Claim
26 words
A homogeneous self energising seal as claimed in claim 1 wherein the trunk of the seal has outwardly curved upper portions merging into said sealing lip.
Claim 7
Dependent Claim
25 words
A homogeneous self energising seal as claimed in claim 1 wherein the side walls of said trunk tapers inwardly towards the bottom of the seal.
Claim 8
Dependent Claim
21 words
A homogeneous self energising seal as claimed in any one of claims 1-6 wherein the bottom of the seal is flat.
Claim 9
Dependent Claim
27 words
A homogeneous self energising seal as claimed in any one of claims 1-6 wherein the bottom of the seal is provided with a centrally disposed concave seat.
Claim 10
Dependent Claim
48 words
A homogeneous self energising seal as claimed in any one of claims 1 to 8 wherein the depth of the slots or troughs is such as to allow the seal to be twisted relatively easy so as to facilitate the fitting of the seal into a blind recess.
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) | 1987-03-27 | 1987-09-26 | 1988-03-27 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1991-03-27 | 1991-09-26 | 1992-03-27 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1995-03-27 | 1995-09-26 | 1996-03-27 | $7700.00 | Window Closed / Lapsed |