Patent US4119903A successfully refreshed from Google Patents.
US4119903A
Expired / Lapsed
US
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Defibrillator charging circuit
Assignee: HP Inc
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Filing: 1978-01-05
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Granted: 1978-10-10
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Expires: 1998-01-05
Abstract
Abstract Change in the charge level of a storage capacitor of a defibrillator is accomplished by setting the charge control to the new level and successively closing and opening the charge switch. This actuates the safety relay so as to remove a low impedance shunt from the capacitor and it initiates the charging action. Charging ceases when the preset charge level is reached.
Inventors
- 👤 Sherman Jack Pirkle
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-27 17:47
CPC Classifications
H; H03; H03K; H03K3/00; H03K3/02; H03K3/53; A; A61; A61N; A61N1/00; A61N1/18; A61N1/32; A61N1/38; A61N1/39; A61N1/3925
Claims Analysis
Total Claims: 4
Claim 1
Independent Claim
72 words
In a defibrillator, a storage capacitor, a safety relay having an armature that is closed when said relay is de-energized, said armature, when closed, providing a low impedance discharge path for said storage capacitor, a battery, charging means coupled between said battery and said capacitor for charging said capacitor when said means is energized, said means being normally de-energized, a charge switch having one side connected to one side of said battery,
Claim 2
Dependent Claim
72 words
In a defibrillator, a storage capacitor, a safety relay having an armature that is closed when said relay is de-energized, said armature, when closed, providing a low impedance discharge path for said storage capacitor, a battery, charging means coupled between said battery and said capacitor for charging said capacitor when said means is energized, said means being normally de-energized, a charge switch having one side connected to one side of said battery,
Claim 3
Dependent Claim
58 words
means coupled between the other side of said switch for energizing said safety relay when said switch is closed so as to open its armature and remove the discharge path from said storage capacitor, and means responsive to the closure of said switch for energizing said charging means so as to cause it to charge said storage capacitor.
Claim 4
Dependent Claim
58 words
means coupled between the other side of said switch for energizing said safety relay when said switch is closed so as to open its armature and remove the discharge path from said storage capacitor, and means responsive to the closure of said switch for energizing said charging means so as to cause it to charge said storage capacitor.
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) | 1981-10-09 | 1982-04-10 | 1982-10-10 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1985-10-09 | 1986-04-10 | 1986-10-10 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1989-10-09 | 1990-04-10 | 1990-10-10 | $7700.00 | Window Closed / Lapsed |