Patent US1894798A successfully refreshed from Google Patents.
US5226899A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Catheter tubing of controlled in vivo softening
Assignee: Becton Dickinson and Co
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Filing: 1991-08-15
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Granted: 1993-07-13
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Expires: 2011-08-15
Abstract
Abstract A catheter tubing has a layer of a hydrophobic stiffening polymer encapsulated by a layer of hydrophilic thermoplastic base polymer. Preferred stiffening polymers are polyesterpolyether block copolymers. Preferred base polymers are thermoplastic polyetherurethanes. The encapsulated layer may be a stripe or an annular layer having base polymer layers laminated on both surfaces thereof.
Inventors
- 👤 Min-Shiu Lee
- 👤 Mutlu Karakelle
- 👤 David E. Spielvogel
- 👤 Robert A. Taller
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 14:05
CPC Classifications
A; A61; A61M; A61M25/00; A61M25/0043; A61M25/0054; A61L; A61L29/00; A61L29/08; A61L29/085; A61L29/14; B; B29; B29C; B29C48/00; B29C48/03; B29C48/09; B29C48/16; B29C48/18; B29C48/21; A61M2025/0063; A61M2025/0064; B29L; B29L2031/00; B29L2031/753; B29L2031/7542
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
45 words
A catheter tubing comprising a stripe of a thermoplastic hydrophobic polyester-polyether block copolymer having a Shore D hardness of about 50 to 80 encapsulated in a hydrophilic thermoplastic polyetherurethane, said polyetherurethane consisting essentially of the reaction product of 4,4'-diphenylmethane diisocyanate, polytetramethylene ether glycol and 1,4-butanediol.
Claim 2
Dependent Claim
45 words
A catheter tubing comprising a stripe of a thermoplastic hydrophobic polyester-polyether block copolymer having a Shore D hardness of about 50 to 80 encapsulated in a hydrophilic thermoplastic polyetherurethane, said polyetherurethane consisting essentially of the reaction product of 4,4'-diphenylmethane diisocyanate, polytetramethylene ether glycol and 1,4-butanediol.
References Cited (Backward Citations)
US3825036A
Cited
US4211741A
Cited
US4657024A
Cited
US4371686A
Cited
US4424305A
Cited
US4454309A
Cited
US4780512A
Cited
US4883699A
Cited
US4689386A
Cited
US4790817A
Cited
US4668221A
Cited
US4781703A
Cited
US4810582A
Cited
US4798876A
Cited
US4728322A
Cited
US4790831A
Cited
US4798597A
Cited
US4900314A
Cited
US4976703A
Cited
US4789720A
Cited
US4994047A
Cited
US4898591A
Cited
US4944278A
Cited
US4990143A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1996-07-12 | 1997-01-11 | 1997-07-13 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 2000-07-12 | 2001-01-11 | 2001-07-13 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2004-07-12 | 2005-01-11 | 2005-07-13 | $7700.00 | Window Closed / Lapsed |