Patent US4406982A successfully refreshed from Google Patents.
US4406982A
Expired / Lapsed
US
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DC Motor control circuit
Assignee: T & L ENTERPRISES Inc A CORP OF MICH
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Filing: 1981-11-12
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Granted: 1983-09-27
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Expires: 2001-11-12
Abstract
Abstract A DC motor control circuit including a DC voltage source, a DC motor electrically connected in series with the voltage source and a controllable current control device electrically connected totally in series with the voltage source and the motor. A rheostat electrically connects the current input and control input terminals of the current control device so that the current flowing through the circuit may be varied by varying the resistance provided by the rheostat. All current flowing through the current control device also flows through the motor.
Inventors
- 👤 Theodore A. McClellan, Jr.
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-01 17:16
CPC Classifications
H; H02; H02P; H02P7/00; H02P7/06; H02P7/18; H02P7/24; H02P7/28; H02P7/285; H02P7/288; Y; Y10; Y10S; Y10S388/00; Y10S388/90; Y10S388/903
Claims Analysis
Total Claims: 11
Claim 1
Independent Claim
18 words
The embodiments of the invention in which an exclusive property or privilege is claimed are defined as follows:
Claim 2
Dependent Claim
102 words
A DC motor control circuit comprising: a DC voltage source; a DC motor electrically connected in series with said voltage source; a controllable current control device having a current input terminal, a current output terminal, and a control input terminal, said control device being electrically connected in series by said current input terminal and said current output terminal with said voltage source and said motor; and variable resistance means connected between said current input terminal and said control input terminal for controlling the speed of said motor, all of the current passing through said current control device also passing through said motor.
Claim 3
Dependent Claim
33 words
A circuit as defined in claim 1 wherein said battery includes a positive terminal and said current control device is electrically connected between said positive terminal of said voltage source and said motor.
Claim 4
Dependent Claim
16 words
A circuit as defined in claim 2 wherein said current control device comprises an NPN transistor.
Claim 5
Dependent Claim
20 words
A circuit as defined in claim 3 further comprising a fuse electrically connected in series to said current output terminal.
Claim 6
Dependent Claim
16 words
A circuit as defined in claim 1 wherein said current control device comprises an NPN transistor.
Claim 7
Dependent Claim
156 words
An electrical circuit comprising: a DC voltage source having a positive terminal and a negative terminal; a load having first and second terminals, said second terminal being electrically connected to said negative terminal on said voltage source; a first controllable current control device having a control input terminal, a current input terminal and a current output terminal, said current input terminal being electrically connected to said positive terminal of said voltage source and said current output terminal being electrically connected to said first terminal on said load; and variable resistance means connected between said current input terminal and said control input terminal, said means having a first terminal electrically connected to said current input terminal and a second terminal electrically connected to said control input terminal, whereby all of the current passing through said current control device also passes through said load and said current may be varied by varying the resistance provided by said means.
Claim 8
Dependent Claim
17 words
A circuit as defined in claim 6 wherein said current control device comprises a first NPN transistor.
Claim 9
Dependent Claim
23 words
A circuit as defined in claim 7 further comprising a fuse electrically connected in series between said current output terminal and said load.
Claim 10
Dependent Claim
24 words
A circuit as defined in claim 7 further comprising at least one additional NPN transistor electrically connected in parallel with said first NPN transistor.
Claim 11
Dependent Claim
27 words
A circuit as defined in claim 6 further comprising at least one additional controllable current control device electrically connected in parallel with said first current control device.
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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) | 1986-09-26 | 1987-03-28 | 1987-09-27 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1990-09-26 | 1991-03-28 | 1991-09-27 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1994-09-26 | 1995-03-28 | 1995-09-27 | $7700.00 | Window Closed / Lapsed |