US3937800A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Bronchographic x-ray contrast method
Assignee: Individual
•
Filing: 1974-04-03
•
Granted: 1976-02-10
•
Expires: 1994-04-03
Abstract
Abstract An X-ray contrast method containing as the essential radioopaque ingredient finely divided tantalum metal dispersed in a liquid vehicle having critical viscosity and flow properties. The metal has an average particle diameter in the range from about 0.5 to about 30 microns, and preferably in the range from about 1 to about 5 microns in a physiologically and pharmaceutically acceptable amount for use in obtaining X-ray films of sufficient clarity and detail for use in bronchography.
Inventors
- 👤 Peter Dure-Smith
- 👤 Roger L. Schnaare
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-03 19:28
CPC Classifications
A; A61; A61K; A61K49/00; A61K49/04; A61K49/0409
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
131 words
In the process of producing a bronchiograph using tantalum the improvement which comprises employing the tantalum in a composition comprising about 20 to about 70% by weight of finely divided tantalum metal having an average diameter of from about 0.5 to about 30 microns and from about 5% to about 15% of a metallic soap which is oil soluble and prepared from a hydroxide of a polyvalent metallic ion and a fatty acid containing from about 12 to about 18 carbon atoms, dispersed in a liquid vehicle which comprises the remainder of the composition said vehicle having an apparent viscosity of from about 100 centipoise to about 1,000 centipoise at body temperature as measured by a Brookfield Viscometer, and exhibiting non-Newtonian flow properties in an effective amount and administering said composition.
Claim 2
Dependent Claim
131 words
In the process of producing a bronchiograph using tantalum the improvement which comprises employing the tantalum in a composition comprising about 20 to about 70% by weight of finely divided tantalum metal having an average diameter of from about 0.5 to about 30 microns and from about 5% to about 15% of a metallic soap which is oil soluble and prepared from a hydroxide of a polyvalent metallic ion and a fatty acid containing from about 12 to about 18 carbon atoms, dispersed in a liquid vehicle which comprises the remainder of the composition said vehicle having an apparent viscosity of from about 100 centipoise to about 1,000 centipoise at body temperature as measured by a Brookfield Viscometer, and exhibiting non-Newtonian flow properties in an effective amount and administering said composition.
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) | 1979-02-09 | 1979-08-11 | 1980-02-10 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1983-02-09 | 1983-08-11 | 1984-02-10 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1987-02-09 | 1987-08-11 | 1988-02-10 | $7700.00 | Window Closed / Lapsed |