Patent US3979130A successfully refreshed from Google Patents.
US3979130A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Sleeves
Assignee: Fisons Ltd
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Filing: 1975-07-31
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Granted: 1976-09-07
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Expires: 1995-07-31
Abstract
Abstract An improved open ended frusto conical sleeve member suitable for use as a sealing interface between the co-operating mating surfaces of a tapered male/female push fit type glassware joint is disclosed. The sleeve member, which has a wall thickness of less than 1.5 mm includes at least two integral, generally circumferential ribs and an external annular flange for gripping during assembly and disassembly of a joint incorporating the sleeve member. The sleeve member, the ribs and the annular flange are constructed from a material having a static coefficient of friction of less than 0.2, a hardness of from 50 to 80 on the Shore D scale, and which is resistant to thermal degradation up to 200°C and to structural degradation when immersed in a corrosive chemical for 12 hours at 50°C.
Inventors
- 👤 George Raymond Cowie
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-03 11:03
CPC Classifications
B; B01; B01L; B01L3/00; B01L3/56; B01L3/565; F; F16; F16L; F16L49/00; F16L49/02; F05; F05C; F05C2225/00; F05C2225/04
Claims Analysis
Total Claims: 10
Claim 1
Independent Claim
194 words
In an open ended conical sleeve member having a wall thickness of from 0.1 to 1.5 mm and suitable for use as a sealing interface between the co-operating mating surfaces of a tapered male/female push fit type glassware joint, the improvements which comprise: said sleeve having a substantially smooth exterior surface; at least two generally circumferential ribs integral with the interior surface of said sleeve member; an external integral annular flange positioned at the broader end of said sleeve member and extending radially outwardly therefrom, whereby said sleeve member may be gripped during assembly and dismantling of a joint incorporating the sleeve member; said sleeve member, said generally circumferential ribs and said annular flange being constructed from a material having a static coefficient of friction of less than 0.2, having a modulus of elasticity in the range of 80 × 10 3 to 200 × 10 3 at 23°C, having a hardness as measured on the Shore D scale of from 50 to 80, being resistant to thermal degradation at temperatures up to 200°C and being resistant to structural degradation when immersed in a corrosive chemical for a period of 12 hours at 50°C.
Claim 2
Dependent Claim
194 words
In an open ended conical sleeve member having a wall thickness of from 0.1 to 1.5 mm and suitable for use as a sealing interface between the co-operating mating surfaces of a tapered male/female push fit type glassware joint, the improvements which comprise: said sleeve having a substantially smooth exterior surface; at least two generally circumferential ribs integral with the interior surface of said sleeve member; an external integral annular flange positioned at the broader end of said sleeve member and extending radially outwardly therefrom, whereby said sleeve member may be gripped during assembly and dismantling of a joint incorporating the sleeve member; said sleeve member, said generally circumferential ribs and said annular flange being constructed from a material having a static coefficient of friction of less than 0.2, having a modulus of elasticity in the range of 80 × 10 3 to 200 × 10 3 at 23°C, having a hardness as measured on the Shore D scale of from 50 to 80, being resistant to thermal degradation at temperatures up to 200°C and being resistant to structural degradation when immersed in a corrosive chemical for a period of 12 hours at 50°C.
Claim 3
Dependent Claim
23 words
The improved open ended frusto conical sleeve member as defined in claim 1, wherein said generally circumferential ribs have a semi-circular cross section.
Claim 4
Dependent Claim
23 words
The improved open ended frusto conical sleeve member as defined in claim 1, wherein said generally circumferential ribs have a triangular cross section.
Claim 5
Dependent Claim
23 words
The improved open ended frusto conical sleeve member as defined in claim 1, wherein said generally circumferential ribs have a trapezoidal cross section.
Claim 6
Dependent Claim
29 words
The improved open ended frusto-conical sleeve member as defined in claim 1, wherein said sleeve member, said generally circumferential ribs and said annular flange are made from sintered polytetrafluoroethylene.
Claim 7
Dependent Claim
27 words
The improved open ended sleeve as claimed in claim 1, wherein all said generally circumferential ribs are located intermediate and spaced from the ends of the sleeve.
Claim 8
Dependent Claim
22 words
The improved open ended frusto-conical sleeve member as defined by claim 1, wherein the depth of said ribs is approximately 0.25 mm.
Claim 9
Dependent Claim
26 words
The improved open ended frusto-conical sleeve member as defined in claim 1, wherein said sleeve member, at the narrower end thereof, has an interiorly thickened portion.
Claim 10
Dependent Claim
33 words
The improved open ended frusto-conical sleeve member as defined in claim 1, wherein said wall thickness is substantially uniform throughout the length of said sleeve member, exclusive of said ribs and said flange.
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) | 1979-09-07 | 1980-03-08 | 1980-09-07 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1983-09-07 | 1984-03-08 | 1984-09-07 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1987-09-07 | 1988-03-08 | 1988-09-07 | $7700.00 | Window Closed / Lapsed |