Patent US3929504A successfully refreshed from Google Patents.
US3929504A
Expired / Lapsed
US
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Rechargeable power source
Assignee: Northrop Grumman Innovation Systems LLC
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Filing: 1974-12-18
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Granted: 1975-12-30
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Expires: 1994-12-18
Abstract
Abstract A new power source capable of operating in a discharge mode and in a charge mode, including a lithium anode, a vanadium pentoxide cathode and an electrolyte including lithium perchlorate dissolved in propylene carbonate. Also included is a means for enclosing one of the electrodes with a permeable material to permit passage of electrolyte ions and yet prevent passage of larger lithium metal formed during operation in the charge mode.
Inventors
- 👤 Jon S Gore
- 👤 Charles R Walk
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-27 19:34
CPC Classifications
H; H01; H01M; H01M10/00; H01M10/05; Y; Y02; Y02E; Y02E60/00; Y02E60/10
Claims Analysis
Total Claims: 6
Claim 1
Independent Claim
61 words
A SECONDARY ENERGY CELL CAPABLE OF OPERATING IN THE DISCHARGE MODE AND IN THE CHARGE MODE, COMPRISING: A LITHIUM ANODE; A VANADIUM PENTOXIDE CATHODE; AN ELECTROLYTE INCLUDING LITHIUM PERCHLORATE DISSOLVED IN PROPYLENE CARBONATE; AND MEANS FOR ENCLOSING AT LEAST ONE ELECTRODE, SAID MEANS HAVING A PERMEABILITY TO PERMIT PASSAGE OF ELECTROLYTE IONS AND PREVENT MIGRATION OF LITHIUM METAL FROM SAID ANODE.
Claim 2
Dependent Claim
61 words
A SECONDARY ENERGY CELL CAPABLE OF OPERATING IN THE DISCHARGE MODE AND IN THE CHARGE MODE, COMPRISING: A LITHIUM ANODE; A VANADIUM PENTOXIDE CATHODE; AN ELECTROLYTE INCLUDING LITHIUM PERCHLORATE DISSOLVED IN PROPYLENE CARBONATE; AND MEANS FOR ENCLOSING AT LEAST ONE ELECTRODE, SAID MEANS HAVING A PERMEABILITY TO PERMIT PASSAGE OF ELECTROLYTE IONS AND PREVENT MIGRATION OF LITHIUM METAL FROM SAID ANODE.
Claim 3
Dependent Claim
46 words
The cell of claim 1 wherein said means for enclosing at least one electrode includes a porous member surrounding said lithium anode in close relationship therewith to prevent lithium metal from depositing, other than on said anode, during operation of said cell in the charge mode.
Claim 4
Dependent Claim
20 words
The cell of claim 1 wherein said electrolyte comprises a 1 molar solution of lithium perchlorate dissolved in propylene carbonate.
Claim 5
Dependent Claim
34 words
The cell of claim 1 wherein said porous member comprises a flexible porous material inert to the anode, cathode and electrolyte, said material having a pore size ranging from 0.3 micron to 30 micron.
Claim 6
Dependent Claim
23 words
The cell of claim 4 wherein said porous material is a natural rubber composite having an average pore size of about 2 micron.
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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) | 1978-12-29 | 1979-06-30 | 1979-12-30 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1982-12-29 | 1983-06-30 | 1983-12-30 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1986-12-29 | 1987-06-30 | 1987-12-30 | $7700.00 | Window Closed / Lapsed |