US3878031A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Packing for movable machine parts
Assignee: Individual
•
Filing: 1973-10-12
•
Granted: 1975-04-15
•
Expires: 1993-10-12
Abstract
Abstract A packing to be arranged between movable machine parts, comprising a core which contains a mixture of polytetrafluoroethylene and at least one element selected from the group consisting of silicone oil, graphite and molybdenum, and a coating of fibrous material surrounding said core.
Inventors
- 👤 Frederic J Dormer
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-28 23:17
CPC Classifications
F; F16; F16J; F16J15/00; F16J15/16; F16J15/18; F16J15/20; Y; Y10; Y10T; Y10T428/00; Y10T428/29; Y10T428/2913; Y10T428/2915; Y10T428/2929; Y10T428/2933; Y10T428/294; Y10T428/296
Claims Analysis
Total Claims: 7
Claim 1
Independent Claim
49 words
A PACKING TO BE ARRANGED BETWEEN MOVABLE PARTS, COMPRISING A CORE WHICH CONTAINS AN HOMOGENOUS MIXTURE OF POLYTETRAFLUOROETHYLENE AND AT LEAST ONE ELEMENT SELECTED FROM THE GROUP CONSISTING OF SILICONE OIL, GRAPHITE AND MOLYBDENUM DISULFIDE FORMING A VISCOUS MASS, AND A POROUS COATING OF FIBROUS MATERIAL SURROUNDING SAID CORE.
Claim 2
Dependent Claim
49 words
A PACKING TO BE ARRANGED BETWEEN MOVABLE PARTS, COMPRISING A CORE WHICH CONTAINS AN HOMOGENOUS MIXTURE OF POLYTETRAFLUOROETHYLENE AND AT LEAST ONE ELEMENT SELECTED FROM THE GROUP CONSISTING OF SILICONE OIL, GRAPHITE AND MOLYBDENUM DISULFIDE FORMING A VISCOUS MASS, AND A POROUS COATING OF FIBROUS MATERIAL SURROUNDING SAID CORE.
Claim 3
Dependent Claim
44 words
A packing according to claim 1 wherein the core consists essentially of polytetrafluoroethylene and at least one element selected from the group consisting of silicone oil, graphite and molybdenum disulfide forming a viscous mass, and a porous coating of fibrous material surrounding said core.
Claim 4
Dependent Claim
41 words
A packing according to claim 1 wherein said core contains 60 to 80% by weight of polytetrafluoroethylene, 4.25 to 13.75% by weight of silicone oil, 15 to 25% by weight of graphite and 0.75 to 1.25% by weight of molybdenum disulfide.
Claim 5
Dependent Claim
33 words
A packing according to claim 1 wherein said core contains 70% by weight of polytetrafluoroethylene, 9% by weight of silicone oil, 20% by weight of graphite and 1% by weight of molybdenum disulfide.
Claim 6
Dependent Claim
42 words
A packing according to claim 1 wherein said porous coating is a porous web of fibrous material selected from the group consisting of vegetable fibres, mineral fibres, asbestos fibres and such plastic fibres which establish a permanent porous structure of the web.
Claim 7
Dependent Claim
15 words
A packing according to claim 1 wherein said porous coating is a porous tubular knitting.
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) | 1978-04-14 | 1978-10-14 | 1979-04-15 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1982-04-14 | 1982-10-14 | 1983-04-15 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1986-04-14 | 1986-10-14 | 1987-04-15 | $7700.00 | Window Closed / Lapsed |