US4401837A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Exo-tetrahydrotricyclopentadiene, a high density liquid fuel
Assignee: United States Department of the Navy
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Filing: 1980-06-02
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Granted: 1983-08-30
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Expires: 2000-06-02
Abstract
Abstract A high density fuel for airbreathing or bi-propellant engines consisting ofxo-tetrahydrotricyclopentadiene (EXO-THTC) alone and in mixtures with other high density fuels. Processes for their preparation are also disclosed.
Inventors
- 👤 George W. Burdette
- 👤 Abraham I. Schneider
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-24 20:17
CPC Classifications
C; C10; C10L; C10L1/00; C10L1/04; C06; C06B; C06B47/00; C06B47/02; C07; C07C; C07C2/00; C07C2/02; C07C2/50; C07C5/00; C07C5/02; C07C5/03; C07C5/22; C07C5/2206; C07C5/2226; C07C5/2246; C07C5/2253; C07C2521/00; C07C2521/06; C07C2521/08; C07C2523/00; C07C2523/70; C07C2523/74; C07C2523/755; C07C2603/00; C07C2603/56; C07C2603/90; C07C2603/91
Claims Analysis
Total Claims: 4
Claim 1
Independent Claim
104 words
A process for the preparation of a high density fuel for airbreathing engines consisting of exotetrahydrotricyclopentadiene (EXO-THTC) C 15 H 22 , which comprises: distilling the trimer fraction of the reaction mixture from the product of heating dicyclopentadiene in a closed system at a temperature of about 165° C. to about 175° C. and for a period of time sufficient to maximize said trimer yield, hydrogenating said trimer fraction in the presence of nickel-on-Kieselguhr catalyst to form tetrahydrotricyclopentadiene, isomerizing said tetrahydrotricyclopentadiene by treatment with aluminum chloride at a temperature of from 0° C. to 20° C. in a methylene chloride solvent to form exo-tetrahydrotricyclopentadiene.
Claim 2
Dependent Claim
104 words
A process for the preparation of a high density fuel for airbreathing engines consisting of exotetrahydrotricyclopentadiene (EXO-THTC) C 15 H 22 , which comprises: distilling the trimer fraction of the reaction mixture from the product of heating dicyclopentadiene in a closed system at a temperature of about 165° C. to about 175° C. and for a period of time sufficient to maximize said trimer yield, hydrogenating said trimer fraction in the presence of nickel-on-Kieselguhr catalyst to form tetrahydrotricyclopentadiene, isomerizing said tetrahydrotricyclopentadiene by treatment with aluminum chloride at a temperature of from 0° C. to 20° C. in a methylene chloride solvent to form exo-tetrahydrotricyclopentadiene.
Claim 3
Dependent Claim
25 words
A process as in claim 1 wherein said hydrogenation is carried out at a temperature and period of time sufficient to maximize said tetrahydrotricyclopentadiene yield.
Claim 4
Dependent Claim
25 words
A process as in claim 1 wherein about 40 to about 60 weight percent of said EXO-THTC is replaced with a like amount of exo-tetrahydrodicyclopentadiene.
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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) | 1986-08-29 | 1987-02-28 | 1987-08-30 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1990-08-29 | 1991-02-28 | 1991-08-30 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1994-08-29 | 1995-02-28 | 1995-08-30 | $7700.00 | Window Closed / Lapsed |