Patent US4379558A successfully refreshed from Google Patents.
US4379558A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Anti-extrusion packing member
Assignee: Utex Industries Inc
•
Filing: 1981-05-01
•
Granted: 1983-04-12
•
Expires: 2001-05-01
Abstract
Abstract A seal or packing for use in dynamic or static applications subject to stretching, twisting or deforming forces, includes a body member forming the sealing and packing surfaces, together with an anti-extrusion reinforcing element incorporated in the body member. The anti-extrusion element is comprised of a helical round wire spring axially centered within a covering of an overlapping flat wire helical spring. The anti-extrusion elements are bounded or integrally joined to the body member at or near those locations thereon where extruding forces are likely to act.
Inventors
- 👤 Fred B. Pippert
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-02 22:20
CPC Classifications
E; E21; E21B; E21B33/00; E21B33/10; E21B33/12; E21B33/1208; E21B33/1216; F; F16; F16J; F16J15/00; F16J15/16; F16J15/166; Y; Y10; Y10S; Y10S277/00; Y10S277/908; Y10S277/935; Y10S277/944
Claims Analysis
Total Claims: 7
Claim 1
Independent Claim
73 words
A packing comprising: an extrudable body member having at least one sealing surface thereon; and anti-extrusion means incorporated in said body member to form a reinforced portion of said body member; said anti-extrusion means serving to resist extrusion forces acting on said body member in the area contiguous to said reinforced portion, said anti-extrusion means being comprised of a flat helical spring with adjacent helical spring segments overlapping to form a tubular shell.
Claim 2
Dependent Claim
73 words
A packing comprising: an extrudable body member having at least one sealing surface thereon; and anti-extrusion means incorporated in said body member to form a reinforced portion of said body member; said anti-extrusion means serving to resist extrusion forces acting on said body member in the area contiguous to said reinforced portion, said anti-extrusion means being comprised of a flat helical spring with adjacent helical spring segments overlapping to form a tubular shell.
Claim 3
Dependent Claim
15 words
The packing of claim 1 wherein said anti-extrusion means is bonded to said body member.
Claim 4
Dependent Claim
15 words
The packing of claim 1 wherein said helical spring is formed from a metallic substance.
Claim 5
Dependent Claim
15 words
The packing of claim 1 wherein said body member is formed of an elastomeric material.
Claim 6
Dependent Claim
18 words
The packing of claim 1 and further including a round wire helical spring positioned within said tubular shell.
Claim 7
Dependent Claim
18 words
The packing of claim 1 wherein there are a plurality of reinforced portions having anti-extrusion means incorporated therein.
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) | 1986-04-11 | 1986-10-11 | 1987-04-12 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1990-04-11 | 1990-10-11 | 1991-04-12 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1994-04-11 | 1994-10-11 | 1995-04-12 | $7700.00 | Window Closed / Lapsed |