Patent EP0169059B1 successfully refreshed from Google Patents.
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US4449049A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Portable battery-free charger for radiation dosimeters
Assignee: ENERGY United States, Department of
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Filing: 1982-01-28
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Granted: 1984-05-15
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Expires: 2002-01-28
Abstract
Abstract This invention is a novel portable charger for dosimeters of the electrometer type. The charger does not require batteries or piezoelectric crystals and is of rugged construction. In a preferred embodiment, the charge includes a housing which carries means for mounting a dosimeter to be charged. The housing also includes contact means for impressing a charging voltage across the mounted dosimeter. Also, the housing carries a trigger for operating a charging system mounted in the housing. The charging system includes a magnetic loop including a permanent magnet for establishing a magnetic field through the loop. A segment of the loop is coupled to the trigger for movement thereby to positions opening and closing the loop. A coil inductively coupled with the loop generates coil-generated voltage pulses when the trigger is operated to open and close the loop. The charging system includes an electrical circuit for impressing voltage pulses from the coil across a capacitor for integrating the pulses and applying the resulting integrated voltage across the above-mentioned contact means for charging the dosimeter.
Inventors
- 👤 Frank W. Manning
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-02 09:41
CPC Classifications
G; G01; G01T; G01T1/00; G01T1/02; G01T1/14; G01T1/142
Claims Analysis
Total Claims: 12
Claim 1
Independent Claim
141 words
Charging apparatus for an electrometer-type dosimeter, comprising: (a) a housing, (b) means carried by said housing for supporting a dosimeter, (c) electrical-contact means carried by said housing and including a pair of contacts for impressing a charging voltage across a dosimeter, (d) a charging system in said housing, comprising: (1) a magnetic loop including a permanent magnet for establishing magnetic flux therein, said loop including a segment which is hinged for arcuate movement between a loop-closed position and a loop-open position, (2) coil means inductively coupled with said loop for generating voltage pulses when said segment is cycled between its loop-closed and loop-open positions, (3) electrical circuit means for impressing voltage so generated across said pair of contacts, and (e) a trigger carried by said housing, said trigger being operatively coupled to said segment to cycle the same between said positions.
Claim 2
Dependent Claim
141 words
Charging apparatus for an electrometer-type dosimeter, comprising: (a) a housing, (b) means carried by said housing for supporting a dosimeter, (c) electrical-contact means carried by said housing and including a pair of contacts for impressing a charging voltage across a dosimeter, (d) a charging system in said housing, comprising: (1) a magnetic loop including a permanent magnet for establishing magnetic flux therein, said loop including a segment which is hinged for arcuate movement between a loop-closed position and a loop-open position, (2) coil means inductively coupled with said loop for generating voltage pulses when said segment is cycled between its loop-closed and loop-open positions, (3) electrical circuit means for impressing voltage so generated across said pair of contacts, and (e) a trigger carried by said housing, said trigger being operatively coupled to said segment to cycle the same between said positions.
Claim 3
Dependent Claim
27 words
The apparatus of claim 1 wherein said electrical circuit includes means for integrating said voltage pulses and applying the resulting integrated voltage across said pair of contacts.
Claim 4
Dependent Claim
40 words
The apparatus of claim 1 wherein said coil is bridged by a series combination of a first capacitor and a first diode, the cathode of said diode and a terminal of said capacitor being interconnected to provide a common junction.
Claim 5
Dependent Claim
24 words
The apparatus of claim 3 wherein the first diode is sized to discharge the first capacitor when said segment is in the loop-closed position.
Claim 6
Dependent Claim
26 words
The apparatus of claim 4 including a second diode whose anode is connected to said junction and whose cathode is connected to one of said contacts.
Claim 7
Dependent Claim
15 words
The apparatus of claim 5 including a second capacitor which is connected across said contacts.
Claim 8
Dependent Claim
47 words
The apparatus of claim 6 further including switch means and a third capacitor, said switch means normally biased to a first position where it shorts the third capacitor and being movable to a second position where it connects the third capacitor in parallel with the second capacitor.
Claim 9
Dependent Claim
31 words
The apparatus of claim 7 wherein said trigger is movable to a position effecting movement of said segment into loop-open position and movement of said switch means into its second position.
Claim 10
Dependent Claim
219 words
Charging apparatus for an electrometer-type dosimeter, comprising: (a) a housing, (b) means carried by said housing for supporting a dosimeter, (c) electrical-contact means carried by said housing and including a pair of contacts for impressing a charging voltage across a dosimeter, (d) a charging system in said housing, comprising: (1) a magnetic loop including a permanent magnet for establishing magnetic flux therein, said loop including a segment which is hinged for arcuate movement between a loop-closed position and a loop-open position, (2) coil means inductively coupled with said loop for generating voltage pulses when said segment is cycled between its loop-closed and loop-open positions, (3) electrical circuit means for impressing voltage so generated across said pair of contacts, (e) a trigger carried by said housing and mounted for movement in the same plane as said segment, said trigger being operatively coupled to said segment to cycle the same between said positions, (f) a first capacitor in series with said coil, (g) a diode pump comprising a first diode and a second diode, the second diode being connected across the series combination of said coil and capacitor, the cathode of the second diode being connected to said capacitor, and (h) a second capacitor connected across said pump to integrate pulses generated by said coil and also connected across said contacts.
Claim 11
Dependent Claim
219 words
Charging apparatus for an electrometer-type dosimeter, comprising: (a) a housing, (b) means carried by said housing for supporting a dosimeter, (c) electrical-contact means carried by said housing and including a pair of contacts for impressing a charging voltage across a dosimeter, (d) a charging system in said housing, comprising: (1) a magnetic loop including a permanent magnet for establishing magnetic flux therein, said loop including a segment which is hinged for arcuate movement between a loop-closed position and a loop-open position, (2) coil means inductively coupled with said loop for generating voltage pulses when said segment is cycled between its loop-closed and loop-open positions, (3) electrical circuit means for impressing voltage so generated across said pair of contacts, (e) a trigger carried by said housing and mounted for movement in the same plane as said segment, said trigger being operatively coupled to said segment to cycle the same between said positions, (f) a first capacitor in series with said coil, (g) a diode pump comprising a first diode and a second diode, the second diode being connected across the series combination of said coil and capacitor, the cathode of the second diode being connected to said capacitor, and (h) a second capacitor connected across said pump to integrate pulses generated by said coil and also connected across said contacts.
Claim 12
Dependent Claim
21 words
The apparatus of claim 9 wherein said trigger is spring-biased to a position where said segment is in its loop-closed position.
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) | 1987-05-15 | 1987-11-14 | 1988-05-15 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1991-05-15 | 1991-11-14 | 1992-05-15 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1995-05-15 | 1995-11-14 | 1996-05-15 | $7700.00 | Window Closed / Lapsed |