Patent US4455334A successfully refreshed from Google Patents.
US4455334A
Expired / Lapsed
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Molded gland packing
Assignee: Nippon Pillar Packing Co Ltd
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Filing: 1982-05-21
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Granted: 1984-06-19
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Expires: 2002-05-21
Abstract
Abstract A molded packing, comprising a volute laminate of a composite sheet material compressed into a unified annular form of rectangular cross-section. The composite sheet material is formed by unifying an expanded graphite sheet and a reinforcing core member, the laminated core facilitating insertion and removal of the packing and improving sealing performance. The composite sheet material may be formed by pressingly contacting one or two expanded graphite sheets to a core member. The core member may be formed from a metallic net, a metallic foil or a plurality of fine metallic threads.
Inventors
- 👤 Kohzo Ogino
- 👤 Tomikazu Shiomi
- 👤 Yuichi Tanaka
- 👤 Seichi Yamashita
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-29 23:05
CPC Classifications
B; B32; B32B; B32B9/00; B32B9/04; B32B9/041; B32B15/00; B32B15/02; B32B1/00; B32B9/005; B32B9/007; F; F16; F16J; F16J15/00; F16J15/16; F16J15/18; F16J15/20; B32B2581/00; Y; Y10; Y10S; Y10S277/00; Y10S277/924; Y10T; Y10T428/00; Y10T428/13; Y10T428/131; Y10T428/1314; Y10T428/1352; Y10T428/1362; Y10T428/249921; Y10T428/249953; Y10T428/249955; Y10T428/249956; Y10T428/249957; Y10T428/249967
Claims Analysis
Total Claims: 7
Claim 1
Independent Claim
80 words
A molded gland packing, comprising a volute laminate of a composite sheet material compressed into a unified annular form of rectangular cross-section, the composite sheet material having a plurality of spirally-wound and bonded layers, each layer having an expanded graphite sheet and a reinforcing core member embedded in one side of the expanded graphite sheet, the reinforcing core being fully embedded within the cross-section of the laminate and facilitating insertion and removal of the molded packing and improving sealing performance.
Claim 2
Dependent Claim
80 words
A molded gland packing, comprising a volute laminate of a composite sheet material compressed into a unified annular form of rectangular cross-section, the composite sheet material having a plurality of spirally-wound and bonded layers, each layer having an expanded graphite sheet and a reinforcing core member embedded in one side of the expanded graphite sheet, the reinforcing core being fully embedded within the cross-section of the laminate and facilitating insertion and removal of the molded packing and improving sealing performance.
Claim 3
Dependent Claim
17 words
The molded packing as set forth in claim 1, wherein the core member is a netlike structure.
Claim 4
Dependent Claim
17 words
The molded packing as set forth in claim 2, wherein the netlike structure is a metallic net.
Claim 5
Dependent Claim
21 words
The molded packing as set forth in claim 2, wherein the netlike structure comprises a fabric formed from woven inorganic fibers.
Claim 6
Dependent Claim
20 words
The molded packing as set forth in claim 1, wherein the core member comprises at least one fine metallic thread.
Claim 7
Dependent Claim
17 words
The molded packing as set forth in claim 1, wherein the core member comprises a metallic foil.
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) | 1987-06-19 | 1987-12-19 | 1988-06-19 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1991-06-19 | 1991-12-19 | 1992-06-19 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1995-06-19 | 1995-12-19 | 1996-06-19 | $7700.00 | Window Closed / Lapsed |