Patent US4755398A successfully refreshed from Google Patents.
US4755398A
Expired / Lapsed
US
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Power source utilizing encapsulated lithium pellets and method of making such pellets
Assignee: Sundstrand Corp
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Filing: 1987-01-21
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Granted: 1988-07-05
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Expires: 2007-01-21
Abstract
Abstract Encapsulated lithium including a shot shaped and sized body (10) of lithium metal encapsulated in a thin layer (12) of a predominantly fluorine substituted polyolefin based polymeric material, a method of making the same and a power plant utilizing the encapsulated lithium as fuel (FIG. 3).
Inventors
- 👤 John T. Buford
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-09 22:35
CPC Classifications
C; C10; C10L; C10L5/00; C10L5/40; B; B01; B01J; B01J13/00; B01J13/02; B01J13/04; Y; Y02; Y02E; Y02E50/00; Y02E50/30
Claims Analysis
Total Claims: 11
Claim 1
Independent Claim
59 words
A method of encapsulating lithium metal comprising: (a) subjecting lithium metal in the solid phase to a liquid containing an effective amount of a predominantly fluorine substituted polymeric material and a carrier therefor, said carrier being non-reactive with said lithium; and (b) evaporating the carrier; (c) at least step (a) being performed in an atmosphere inert to lithium metal.
Claim 2
Independent Claim
59 words
A method of encapsulating lithium metal comprising: (a) subjecting lithium metal in the solid phase to a liquid containing an effective amount of a predominantly fluorine substituted polymeric material and a carrier therefor, said carrier being non-reactive with said lithium; and (b) evaporating the carrier; (c) at least step (a) being performed in an atmosphere inert to lithium metal.
Claim 3
Dependent Claim
30 words
The method of claim 1, wherein steps (a) and (b) are performed repeatedly and in sequence until a desired thickness of the polymeric material on the lithium has been achieved.
Claim 4
Dependent Claim
24 words
The method of claim 1 wherein said liquid further includes a diluent to reduce the rate of evaporation of the carrier during step (b).
Claim 5
Dependent Claim
13 words
The method of claim 1 wherein said inert atmosphere is provided by argon.
Claim 6
Dependent Claim
26 words
The method of claim 1 wherein said lithium metal is in the form of shot and step (a) is performed by spraying while agitating the shot.
Claim 7
Independent Claim
64 words
A method of encapsulating lithium metal shot comprising: (a) agitating the shot; (b) spraying the agitated shot with a liquid dispersion or solution of an effection amount of a predominantly fluorine substituted polymeric material in a lithium compatible solvent at a temperature below the boiling point of the solvent; and (c) slowly evaporating the solvent from the dispersion after its application to the shot.
Claim 8
Independent Claim
64 words
A method of encapsulating lithium metal shot comprising: (a) agitating the shot; (b) spraying the agitated shot with a liquid dispersion or solution of an effection amount of a predominantly fluorine substituted polymeric material in a lithium compatible solvent at a temperature below the boiling point of the solvent; and (c) slowly evaporating the solvent from the dispersion after its application to the shot.
Claim 9
Dependent Claim
30 words
The method of claim 6 wherein steps (a), (b) and (c) are performed in a closed housing and further including the step of purging the housing with an inert gas.
Claim 10
Dependent Claim
16 words
The method of claim 7 wherein step (c) is performed with the aid of slight vacuum.
Claim 11
Dependent Claim
18 words
The method of claim 8 wherein said liquid dispersion or solution is a tetrafluoroethylene telomer in trichlorotrifluoroethane solvent.
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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) | 1991-07-05 | 1992-01-04 | 1992-07-05 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1995-07-05 | 1996-01-04 | 1996-07-05 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1999-07-05 | 2000-01-04 | 2000-07-05 | $7700.00 | Window Closed / Lapsed |