US4794682A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Making a power source utilizing encapsulated lithium pellets
Assignee: Sundstrand Corp
•
Filing: 1986-07-11
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Granted: 1989-01-03
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Expires: 2006-07-11
Abstract
Abstract A heat exchanger 16 for a thermal power source includes a chamber 18 provided with an igniter 28 and a reactant inlet 30. Within the chamber 18 is a mass of lithium pellets 10 and 12, each provided with a coating 14.
Inventors
- 👤 John T. Buford
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-09 22:25
CPC Classifications
C; C10; C10L; C10L5/00; C10L5/40; F; F01; F01K; F01K3/00; F01K3/18; F01K3/188; Y; Y02; Y02E; Y02E50/00; Y02E50/30; Y10; Y10T; Y10T29/00; Y10T29/49; Y10T29/49229; Y10T29/4935
Claims Analysis
Total Claims: 4
Claim 1
Independent Claim
99 words
A method of making a thermal power source comprising the steps of (a) introducing a plurality of lithium pellets having predetermined, substantially differing sizes into a boiler to form part of the power source to result in a predetermined void volume within said boiler defined by the voids between the pellets; (b) introducing a predominately flourine substituted hydrocarbon in a solvent into the boiler; (c) thereafter evaporating the solvent to provide lithium pellets, coated in situ, with said predominately fluorine substituted hydrocarbon and voids within said boiler; (d) backfilling the voids with sulfur hexafluoride; and (e) sealing the boiler.
Claim 2
Independent Claim
99 words
A method of making a thermal power source comprising the steps of (a) introducing a plurality of lithium pellets having predetermined, substantially differing sizes into a boiler to form part of the power source to result in a predetermined void volume within said boiler defined by the voids between the pellets; (b) introducing a predominately flourine substituted hydrocarbon in a solvent into the boiler; (c) thereafter evaporating the solvent to provide lithium pellets, coated in situ, with said predominately fluorine substituted hydrocarbon and voids within said boiler; (d) backfilling the voids with sulfur hexafluoride; and (e) sealing the boiler.
Claim 3
Dependent Claim
27 words
The method of claim 1 wherein two sizes of nominally spherical pellets are used, one size having a diameter about 20 times the diameter of the other.
Claim 4
Dependent Claim
29 words
The method of claim 1 wherein steps (b) and (c) are sequentially repeated until a desired amount of said predominantly fluorine substituted hydrocarbon has built up on said pellets.
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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) | 1992-01-03 | 1992-07-04 | 1993-01-03 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1996-01-03 | 1996-07-04 | 1997-01-03 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2000-01-03 | 2000-07-04 | 2001-01-03 | $7700.00 | Window Closed / Lapsed |