US4407903A
Expired / Lapsed
US
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Electric dc source
Assignee: Ingenieurkontor Lubeck
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Filing: 1981-11-12
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Granted: 1983-10-04
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Expires: 2001-11-12
Abstract
Abstract An electric dc source with fuel cells or fuel batteries connected in series or in series and parallel, not only gives quiet operation, but does so without a large power electronics system, by providing a separate gas supply to each fuel cell or fuel battery and disposing controllable valves in the gas supply lines and connecting outputs having a given polarity of the series connected fuel cells or fuel batteries to a bus bar of the same polarity via electric valves.
Inventors
- 👤 Heinrich Gutbier
- 👤 Karl Strasser
- 👤 Elmar Limberg
- 👤 Volker Jensen
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-25 22:18
CPC Classifications
B; B63; B63H; B63H21/00; B63H21/12; B63H21/17; B63H23/00; B63H23/22; B63H23/24; H; H01; H01M; H01M16/00; H01M16/003; H01M16/006; H01M8/00; H01M8/04; H01M8/04082; H01M8/04089; H01M8/04223; H01M8/04228; H01M8/04298; H01M8/04694; H01M8/04746; H01M8/04753; H01M8/04858; H01M8/04895; H01M8/0491; H01M8/04955; H01M2250/00; H01M2250/20; H01M8/24; H01M8/249; Y; Y02; Y02E; Y02E60/00; Y02E60/10; Y02E60/30; Y02E60/50; Y02T; Y02T70/00; Y02T70/50; Y02T90/00; Y02T90/40
Claims Analysis
Total Claims: 4
Claim 1
Independent Claim
155 words
In an electric dc source made up of fuel cells or fuel batteries, each having terminals of one and the other polarity, which are fed by gas supplies and are connected in series or in series and parallel, one end of the series connection being of the one polarity and having a terminal coupled to a bus bar of that same polarity, the improvement comprising: (a) a separate gas supply line and a controlled valve disposed in each gas supply line for each fuel cell or fuel battery; and (b) electric valves coupling the respective terminals of each of the series connected fuel cells or fuel batteries having the other polarity to a bus bar of said other polarity, whereby said fuel cells or fuel batteries can be controlled by controlling the supply of gas thereto thus controlling the overall voltage supplied by said dc source with isolation achieved by means of said electric valves.
Claim 2
Dependent Claim
155 words
In an electric dc source made up of fuel cells or fuel batteries, each having terminals of one and the other polarity, which are fed by gas supplies and are connected in series or in series and parallel, one end of the series connection being of the one polarity and having a terminal coupled to a bus bar of that same polarity, the improvement comprising: (a) a separate gas supply line and a controlled valve disposed in each gas supply line for each fuel cell or fuel battery; and (b) electric valves coupling the respective terminals of each of the series connected fuel cells or fuel batteries having the other polarity to a bus bar of said other polarity, whereby said fuel cells or fuel batteries can be controlled by controlling the supply of gas thereto thus controlling the overall voltage supplied by said dc source with isolation achieved by means of said electric valves.
Claim 3
Dependent Claim
12 words
The improvement according to claim 1, wherein said electric valves are diodes.
Claim 4
Dependent Claim
13 words
The improvement according to claim 1, wherein said electric valves are controlled valves.
References Cited (Backward Citations)
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1986-10-03 | 1987-04-04 | 1987-10-04 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1990-10-03 | 1991-04-04 | 1991-10-04 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1994-10-03 | 1995-04-04 | 1995-10-04 | $7700.00 | Window Closed / Lapsed |