US4187252A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Tetramethylpentane blood substitutes
Assignee: Cincinnati Children's Hospital Medical Center
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Filing: 1978-04-03
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Granted: 1980-02-05
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Expires: 1998-04-03
Abstract
Abstract Perfluorination of 2,2,4,4-tetramethylpentane by direct fluorination with F2 or like reagents at low temperature, using inert gaseous diluents, yields a mixture of perfluoro 2,2,4,4-tetramethylpentane and 3-hydro-nonadecafluoro 2,2,4,4-tetramethylpentane together with lesser amounts of 3,3-dihydro-octadecafluoro 2,2,4,4-tetramethylpentane. The perfluoro and nonadecafluoro-tetramethylpentane mixture is useful in synthetic blood substitute compositions.
Inventors
- 👤 Richard J. Lagow
- 👤 Lawrence A. Shimp
- 👤 Leland C. Clark, Jr.
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 16:20
CPC Classifications
A; A61; A61K; A61K9/00; A61K9/0012; A61K9/0019; A61K9/0026; A61K31/00; A61K31/02; C; C07; C07C; C07C19/00; C07C19/08
Claims Analysis
Total Claims: 4
Claim 1
Independent Claim
1 words
Perfluoro-2,2,4,4-tetramethylpentane.
Claim 2
Dependent Claim
1 words
Perfluoro-2,2,4,4-tetramethylpentane.
Claim 3
Dependent Claim
1 words
3-Hydro-nonadecafluoro-2,2,4,4-tetramethylpentane.
Claim 4
Dependent Claim
1 words
3-Hydro-nonadecafluoro-2,2,4,4-tetramethylpentane.
References Cited (Backward Citations)
US3317618A
Cited
US3962358A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1983-02-04 | 1983-08-06 | 1984-02-05 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1987-02-04 | 1987-08-06 | 1988-02-05 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1991-02-04 | 1991-08-06 | 1992-02-05 | $7700.00 | Window Closed / Lapsed |