Patent US5235232A successfully refreshed from Google Patents.
US5235232A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Adjustable-output electrical energy source using light-emitting polymer
Assignee: EF Johnson Co
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Filing: 1990-09-04
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Granted: 1993-08-10
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Expires: 2010-09-04
Abstract
Abstract A long-life, electrical energy source having an adjustable output is comprised of a light emitting phosphor activated by a radioisotope and coupled to a plurality of photovoltalic cells that have their outputs electrically connected together. The output power of the electrical energy source is effectively regulated by selectively changing the connections of the outputs of the photovoltaic cells in response to the progression of time.
Inventors
- 👤 Jerry J. Conley
- 👤 Gary B. Mortensen
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-01 22:27
CPC Classifications
G; G21; G21H; G21H1/00; G21H1/12; H; H10; H10F; H10F55/00; Y; Y10; Y10S; Y10S136/00; Y10S136/291; Y10S136/293; Y10S323/00; Y10S323/906
Claims Analysis
Total Claims: 13
Claim 1
Independent Claim
73 words
A power supply comprising: a) a phosphor which radiates light in response to nuclear decay of an isotope; b) a plurality of photovoltaics optically coupled to the phosphor and electrically connected to each other, each of which produces a current which decreases as time progresses; and c) means for selectively changing the electrical interconnections among the photovoltaics in response to the progression of time, for maintaining the total output voltage provided by them.
Claim 2
Dependent Claim
73 words
A power supply comprising: a) a phosphor which radiates light in response to nuclear decay of an isotope; b) a plurality of photovoltaics optically coupled to the phosphor and electrically connected to each other, each of which produces a current which decreases as time progresses; and c) means for selectively changing the electrical interconnections among the photovoltaics in response to the progression of time, for maintaining the total output voltage provided by them.
Claim 3
Dependent Claim
70 words
A power supply, comprising: a) a plurality of photovoltaic units which produce electric power at rate which decays as time progresses; b) compensation means for maintaining the voltage of the electric power above a predetermined minimum in response to the progression of time; c) phosphor means for supplying light to the photovoltaic units; and d) isotope means for producing nuclear decay products and inducing the phosphor to produce the light.
Claim 4
Dependent Claim
70 words
A power supply, comprising: a) a plurality of photovoltaic units which produce electric power at rate which decays as time progresses; b) compensation means for maintaining the voltage of the electric power above a predetermined minimum in response to the progression of time; c) phosphor means for supplying light to the photovoltaic units; and d) isotope means for producing nuclear decay products and inducing the phosphor to produce the light.
Claim 5
Dependent Claim
65 words
A power supply, comprising: a) isotope means for producing radiation which causes a phosphor means to produce light of an intensity which decays with time; b) a plurality of photovoltaics for receiving the light and producing an electric current in response; and c) a system of switches which progressively places the electric current of more of the photovoltaics into electrical series connection as time progresses.
Claim 6
Dependent Claim
65 words
A power supply, comprising: a) isotope means for producing radiation which causes a phosphor means to produce light of an intensity which decays with time; b) a plurality of photovoltaics for receiving the light and producing an electric current in response; and c) a system of switches which progressively places the electric current of more of the photovoltaics into electrical series connection as time progresses.
Claim 7
Dependent Claim
86 words
A regulated power supply, comprising: a) a phosphor which is induced to produce light in response to radiation produced by nuclear decay of a substance; b) a plurality of photovoltaics, each of which i) receives some of the light and ii) produces a voltage in response; c) a load to be supplied by the photovoltaics; and d) means for selectively connecting the photovoltaics in different ways to the load, in order to maintain the voltage applied to the load in response to the progression of time.
Claim 8
Dependent Claim
86 words
A regulated power supply, comprising: a) a phosphor which is induced to produce light in response to radiation produced by nuclear decay of a substance; b) a plurality of photovoltaics, each of which i) receives some of the light and ii) produces a voltage in response; c) a load to be supplied by the photovoltaics; and d) means for selectively connecting the photovoltaics in different ways to the load, in order to maintain the voltage applied to the load in response to the progression of time.
Claim 9
Independent Claim
97 words
A method of supplying electrical power to a load, comprising the following steps: a) generating the electrical power by illuminating a plurality of photovoltaics with light produced by phosphors; b) irradiating the phosphors with nuclear radiation originating from a source, such that: i) the intensity of radiation produced by the source diminishes as time progresses; and ii) the photovoltaics initially produce more power than needed by the load; and c) in response to the progression of time, periodically changing the interconnections among the photovoltaics such that the voltage provided to the load is maintained after each change.
Claim 10
Independent Claim
97 words
A method of supplying electrical power to a load, comprising the following steps: a) generating the electrical power by illuminating a plurality of photovoltaics with light produced by phosphors; b) irradiating the phosphors with nuclear radiation originating from a source, such that: i) the intensity of radiation produced by the source diminishes as time progresses; and ii) the photovoltaics initially produce more power than needed by the load; and c) in response to the progression of time, periodically changing the interconnections among the photovoltaics such that the voltage provided to the load is maintained after each change.
Claim 11
Dependent Claim
68 words
A regulated power supply, comprising: a) phosphor means which is induced to radiate light in response to radiation produced by nuclear decay of a substance; b) a plurality of photovoltaics, each of which i) receives some of the light and ii) produces a voltage in response; c) sequence means for altering the interconnections among the photovoltaics, such that more photovoltaics are electrically connected in series as time progresses.
Claim 12
Dependent Claim
68 words
A regulated power supply, comprising: a) phosphor means which is induced to radiate light in response to radiation produced by nuclear decay of a substance; b) a plurality of photovoltaics, each of which i) receives some of the light and ii) produces a voltage in response; c) sequence means for altering the interconnections among the photovoltaics, such that more photovoltaics are electrically connected in series as time progresses.
Claim 13
Dependent Claim
27 words
Apparatus according to claim 6 in which the sequence means includes a timing means, and in which the alteration is performed according to a predetermined time schedule.
References Cited (Backward Citations)
CA615938A
Cited
US1640393A
Cited
US2259372A
Cited
GB638106A
Cited
US2847585A
Cited
US3094634A
Cited
US3005942A
Cited
US3031519A
Cited
US3033797A
Cited
US3037067A
Cited
US3053927A
Cited
US3304445A
Cited
US3325420A
Cited
US3342743A
Cited
US3737689A
Cited
US3483040A
Cited
US3843896A
Cited
US3740273A
Cited
US3591420A
Cited
US3767947A
Cited
US3620917A
Cited
US3939366A
Cited
US4118633A
Cited
JPS5173393A
Cited
US4024420A
Cited
US4020003A
Cited
US4075034A
Cited
US4328456A
Cited
US4175249A
Cited
US4213052A
Cited
US4242147A
Cited
US4374749A
Cited
US4375423A
Cited
US4327318A
Cited
US4577052A
Cited
US4551669A
Cited
US4628143A
Cited
US4900368A
Cited
US4730115A
Cited
EP0204167A2
Cited
US4677008A
Cited
US4835433A
Cited
US4728878A
Cited
US5001415A
Cited
US4889660A
Cited
US5082505A
Cited
US5008579A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1996-08-09 | 1997-02-08 | 1997-08-10 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 2000-08-09 | 2001-02-08 | 2001-08-10 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2004-08-09 | 2005-02-08 | 2005-08-10 | $7700.00 | Window Closed / Lapsed |