US3608555A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Radio opaque and optically transparent tubing
Assignee: Saint Gobain Performance Plastics Corp
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Filing: 1968-12-31
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Granted: 1971-09-28
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Expires: 1988-12-31
Abstract
Abstract Tubing having a smooth inner bore and a smooth even outer surface wherein the properties of X-ray opacity and optical permeability are optimized and maximized by forming the tubing from a plastic and an X-ray opaque substance homogeneously dispersed in the plastic wherein the X-ray opaque substance has a controlled concentration and an index of refraction as close to the index of refraction of the plastic as possible; additionally where the plastic forms crystalline structures it is not annealed during the fabrication of the tubing to further optimize optical permeability of the tubing.
Inventors
- 👤 William L Greyson
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 21:14
CPC Classifications
A; A61; A61L; A61L29/00; A61L29/14; A61L29/18; A61M; A61M25/00; A61M25/0009; A61M25/01; A61M25/0105; A61M25/0108; A61M25/0043; A61M2025/0062
Claims Analysis
Total Claims: 3
Claim 1
Independent Claim
43 words
In a catheter and the like tubing devices as claimed in claim 1 wherein the X-ray opaque material is barium sulfate in a ratio to the fluorocarbon resin from 2 to 10 percent by weight of the total composition of the tubing member.
Claim 2
Dependent Claim
43 words
In a catheter and the like tubing devices as claimed in claim 1 wherein the X-ray opaque material is bismuth oxide in a ratio to the fluorocarbon resin from 2 to 10 percent by weight of the total composition of the tubing member.
Claim 3
Dependent Claim
81 words
In a catheter and the like tubing devices as claimed in claim 1 wherein the X-ray opaque material consists of: a. a first X-ray opaque material of barium sulfate; b. a second X-ray opaque material of bismuth oxide; c. and said barium sulfate and bismuth oxide disposed in a ratio to each other and to the fluorocarbon resin to provide a range of X-ray opaque material of 2 to 10 percent of weight of the total composition of the tubing member.
References Cited (Backward Citations)
US2237218A
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GB634669A
Cited
US2598283A
Cited
GB686445A
Cited
US2720680A
Cited
US2857915A
Cited
US3112748A
Cited
US3228894A
Cited
US3361700A
Cited
US3529633A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1974-09-27 | 1975-03-29 | 1975-09-28 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1978-09-27 | 1979-03-29 | 1979-09-28 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1982-09-27 | 1983-03-29 | 1983-09-28 | $7700.00 | Window Closed / Lapsed |