US4299256A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Coextruded silicone-containing tubing having long term frictional lubrication properties
Assignee: Baxter International Inc
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Filing: 1980-10-06
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Granted: 1981-11-10
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Expires: 2000-10-06
Abstract
Abstract Flexible coextruded tubing having an outer portion (14) of polyvinyl chloride plastic containing a minor amount of intimately mixed silicone oil and having an inner portion (12) of plastic free of silicone oil.
Inventors
- 👤 David V. Bacehowski
- 👤 Peter C. Kwong
- 👤 Harold H. Bowerman, Jr.
- 👤 Leonard F. Czuba
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-25 02:01
CPC Classifications
F; F16; F16L; F16L11/00; F16L11/04; B; B04; B04B; B04B5/00; B04B5/04; B04B5/0442; B29; B29C; B29C48/00; B29C48/03; B29C48/09; B29C48/16; B29C48/18; B29C48/21; B29C48/25; B29C48/30; B29C48/32; B29C48/335; B04B2005/0492; Y; Y10; Y10S; Y10S138/00; Y10S138/07; Y10T; Y10T428/00; Y10T428/13; Y10T428/1352; Y10T428/1379; Y10T428/31504; Y10T428/31652; Y10T428/31663; Y10T428/31667
Claims Analysis
Total Claims: 7
Claim 1
Independent Claim
93 words
A coextruded plastic tubing having a permanently lubricated outer surface which comprises a pair of telescopically related inner and outer cylindrical portions, said inner portion comprising a substantially silicone-free flexible plastic formulation which has a radial thickness of 2 to 4 times that of the outer portion, said outer portion comprising a polyvinyl chloride plastic formulation containing from 2 to 3 percent by weight of a silicone oil comprising dimethylpolysiloxane having a viscosity of 500 to 100,000 cs. at 25° C., said outer portion having a radial thickness of at least 0.025 cm.
Claim 2
Dependent Claim
93 words
A coextruded plastic tubing having a permanently lubricated outer surface which comprises a pair of telescopically related inner and outer cylindrical portions, said inner portion comprising a substantially silicone-free flexible plastic formulation which has a radial thickness of 2 to 4 times that of the outer portion, said outer portion comprising a polyvinyl chloride plastic formulation containing from 2 to 3 percent by weight of a silicone oil comprising dimethylpolysiloxane having a viscosity of 500 to 100,000 cs. at 25° C., said outer portion having a radial thickness of at least 0.025 cm.
Claim 3
Dependent Claim
57 words
Coextruded tubing having a permanently lubricated surface, said coextruded tubing defining telescopically related inner and outer cylindrical portions, said inner portion comprising a flexible plastic material free of silicone oil, and said outer portion comprising a substantially homogeneous mixture of polyvinyl chloride plastic containing essentially 1 to 5 parts by weight of silicone oil homogeneously distributed therein.
Claim 4
Dependent Claim
57 words
Coextruded tubing having a permanently lubricated surface, said coextruded tubing defining telescopically related inner and outer cylindrical portions, said inner portion comprising a flexible plastic material free of silicone oil, and said outer portion comprising a substantially homogeneous mixture of polyvinyl chloride plastic containing essentially 1 to 5 parts by weight of silicone oil homogeneously distributed therein.
Claim 5
Dependent Claim
24 words
The coextruded tubing of claim 2 in which said silicone oil is dimethylpolysiloxane having a viscosity of 500 to 100,000 cs. at 25° C.
Claim 6
Dependent Claim
24 words
The coextruded tubing of claim 3 in which said inner portion is of 2 to 4 times the radial thickness of said outer portion.
Claim 7
Dependent Claim
20 words
The coextruded tubing of claim 3 in which said outer portion has a radial thickness of at least 0.025 cm.
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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) | 1984-11-09 | 1985-05-11 | 1985-11-10 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1988-11-09 | 1989-05-11 | 1989-11-10 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1992-11-09 | 1993-05-11 | 1993-11-10 | $7700.00 | Window Closed / Lapsed |