Automatic charging device
Abstract
Abstract 446,229. Charging batteries; automatic control systems. WETZER, R., Pfronten, Bavaria, Germany. Aug. 16, 1935, No. 23077. [Class 38 (iv)] The voltage of a battery is maintained within two predetermined limits by supplying current at high or low charging rates controlled by a one contact relay which closes and opens at maximum and minimum voltage respectively, the contact pressure being increased by cutting out a series resistance after contact is made. The battery b is charged from the supply terminals k through the charging resistance r, part of which. may be short circuited by contact s actuated by resistance W1 to give the high charging rate. Contact m is then open and current flows from the battery of the relay R through moving coil B and resistance W1. When the voltage rises to the predetermined maximum, contact m closes and short circuits resistance W1, the increased current through coil B increasing the pressure of the contact. Contact S also opens and resistance r is then included in the charging circuit.
Inventors
- 👤 Wetzer Rudolf
Bibliographic Details
Claims Analysis
Total Claims: 0References Cited (Backward Citations)
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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) | 1940-10-18 | 1941-04-19 | 1941-10-19 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1944-10-18 | 1945-04-19 | 1945-10-19 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1948-10-18 | 1949-04-19 | 1949-10-19 | $7700.00 | Window Closed / Lapsed |