US4028324A
Expired / Lapsed
US
⏱️ 0.0 years remaining
High temperature seal material and method for manufacturing the same
Assignee: RTX Corp
•
Filing: 1975-12-16
•
Granted: 1977-06-07
•
Expires: 1995-12-16
Abstract
Abstract An extruded seal material which is stable in phosphoric acid is composed of fibrillating polytetrafluoroethylene, a halogenated oil, and a filler. Preferably the oil is a fluorocarbon oil and the filler is either non-fibrillating polytetrafluoroethylene, silicon carbide or graphite, all of which are stable in phosphoric acid at temperatures up to at least 400° F. This seal material is particularly suited for use in the environment of a phosphoric acid fuel cell.
Inventors
- 👤 Jerome G. Tuschner
- 👤 Richard C. Nickols, Jr.
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-02 23:01
CPC Classifications
H; H01; H01M; H01M8/00; H01M8/08; C; C08; C08K; C08K3/00; C08K3/02; C08K3/04; C08K3/34; C08L; C08L27/00; C08L27/02; C08L27/12; C08L27/18; C08L91/00; C09; C09K; C09K3/00; C09K3/10; C09K3/1025; C09K3/1028; C09K2200/00; C09K2200/02; C09K2200/0204; C09K2200/0208; C09K2200/0243; C09K2200/04; C09K2200/0411; C09K2200/06; C09K2200/0615; C09K2200/0635; C09K2200/0637; C09K2200/0692; Y; Y02; Y02E; Y02E60/00; Y02E60/10; Y02E60/30; Y02E60/50; Y02P; Y02P70/00; Y02P70/50
Claims Analysis
Total Claims: 10
Claim 1
Independent Claim
115 words
An extruded seal material which, before use, consists essentially of: a. 10-40% by weight fibrillating polytetrafluoroethylene; b. 30-50% by weight halogenated oil having the characteristics that it is stable in phosphoric acid up to at least 400° F, has a low volatility up to at least 400° F, and is a liquid at room temperature through at least 400° F; c. 0-5% by weight halogenated solvent; and d. a balance of particulate filler material selected from the group consisting of non-fibrillating polytetrafluoroethylene, silicon carbide, and graphite, or combination thereof; wherein said seal material is rope like in form, and the fibrils of polytetrafluoroethylene are substantially aligned in the direction of the axis of the rope.
Claim 2
Dependent Claim
115 words
An extruded seal material which, before use, consists essentially of: a. 10-40% by weight fibrillating polytetrafluoroethylene; b. 30-50% by weight halogenated oil having the characteristics that it is stable in phosphoric acid up to at least 400° F, has a low volatility up to at least 400° F, and is a liquid at room temperature through at least 400° F; c. 0-5% by weight halogenated solvent; and d. a balance of particulate filler material selected from the group consisting of non-fibrillating polytetrafluoroethylene, silicon carbide, and graphite, or combination thereof; wherein said seal material is rope like in form, and the fibrils of polytetrafluoroethylene are substantially aligned in the direction of the axis of the rope.
Claim 3
Dependent Claim
15 words
The seal material according to claim 1 wherein said halogenated oil is a fluorocarbon oil.
Claim 4
Dependent Claim
13 words
The seal material according to claim 1 wherein said filler is non-fibrillating polytetrafluoroethylene.
Claim 5
Dependent Claim
13 words
The seal material according to claim 1 wherein said filler is silicon carbide.
Claim 6
Dependent Claim
12 words
The seal material according to claim 1 wherein said filler is graphite.
Claim 7
Dependent Claim
15 words
The seal material according to claim 1 wherein said seal material includes essentially no solvent.
Claim 8
Dependent Claim
100 words
An extruded seal material which, before use, consists essentially of: a. 10-40% by weight fibrillating polytetrafluoroethylene; b. 30-50% by weight fluorocarbon oil having the characteristics that it is stable in phosphoric acid up to at least 400° F, has a low volatility up to at least 400° F, and is a liquid at room temperatures through at least 400° F; c. 0-5% by weight fluorocarbon solvent; and d. a balance of non-fibrillating polytetrafluoroethylene powder wherein said seal material is rope like in form, and the fibrils of polytetrafluoroethylene are substantially aligned in the direction of the axis of the rope.
Claim 9
Dependent Claim
100 words
An extruded seal material which, before use, consists essentially of: a. 10-40% by weight fibrillating polytetrafluoroethylene; b. 30-50% by weight fluorocarbon oil having the characteristics that it is stable in phosphoric acid up to at least 400° F, has a low volatility up to at least 400° F, and is a liquid at room temperatures through at least 400° F; c. 0-5% by weight fluorocarbon solvent; and d. a balance of non-fibrillating polytetrafluoroethylene powder wherein said seal material is rope like in form, and the fibrils of polytetrafluoroethylene are substantially aligned in the direction of the axis of the rope.
Claim 10
Dependent Claim
15 words
The seal material according to claim 7 wherein said seal material includes essentially no solvent.
References Cited (Backward Citations)
US2706715A
Cited
US2685707A
Cited
US3000846A
Cited
US3314889A
Cited
US3445393A
Cited
US3480547A
Cited
US3434996A
Cited
US3632788A
Cited
US3639237A
Cited
US3493513A
Cited
US3682859A
Cited
US3630901A
Cited
US3640859A
Cited
US3784471A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1980-06-06 | 1980-12-06 | 1981-06-07 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1984-06-06 | 1984-12-06 | 1985-06-07 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1988-06-06 | 1988-12-06 | 1989-06-07 | $7700.00 | Window Closed / Lapsed |