Patent US3921044A successfully refreshed from Google Patents.
US3921044A
Expired / Lapsed
US
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Electrical dental mallet
Assignee: Individual
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Filing: 1974-01-02
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Granted: 1975-11-18
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Expires: 1994-01-02
Abstract
Abstract An electrically driven dental mallet particularly suitable for condensing gold foil or amalgam restorations is disclosed. The device which utilizes solid state circuitry is actuated by the application of pressure to the condenser point; the condenser point may be stopped by digital pressure on buttons provided on the hand piece thus allowing the condenser point to be used for both hand and mechanical condensing.
Inventors
- 👤 Robert C Mcshirley
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-24 18:09
CPC Classifications
A; A61; A61C; A61C3/00; A61C3/08; H; H02; H02K; H02K33/00; H02K33/02
Claims Analysis
Total Claims: 6
Claim 1
Independent Claim
139 words
In an electrically driven dental mallet, a control unit for generating electrical signals for driving such mallet in reciprocating motion comprising: a controlled rectifier coupled to such mallet, said controlled rectifier including a control terminal; a capacitor coupled to said control terminal of said controlled rectifier; a plurality of adjustable resistance means; a switch having a plurality of positions for selecting a different one of said adjustable resistance means for coupling to said capacitor for each of said positions, said switch being coupled to said capacitor and said resistance means; and, amplitude control means for controlling the amplitude of said electrical signals coupled to such mallet and said controller rectifier; whereby the frequencies of said signals for each switch position, may be separately adjusted by said adjustable resistance means such that a plurality of predetermined frequencies may be preset.
Claim 2
Dependent Claim
139 words
In an electrically driven dental mallet, a control unit for generating electrical signals for driving such mallet in reciprocating motion comprising: a controlled rectifier coupled to such mallet, said controlled rectifier including a control terminal; a capacitor coupled to said control terminal of said controlled rectifier; a plurality of adjustable resistance means; a switch having a plurality of positions for selecting a different one of said adjustable resistance means for coupling to said capacitor for each of said positions, said switch being coupled to said capacitor and said resistance means; and, amplitude control means for controlling the amplitude of said electrical signals coupled to such mallet and said controller rectifier; whereby the frequencies of said signals for each switch position, may be separately adjusted by said adjustable resistance means such that a plurality of predetermined frequencies may be preset.
Claim 3
Dependent Claim
22 words
The control unit for a dental mallet defined by claim 1 wherein said plurality of adjustable resistance means each comprise a potentiometer.
Claim 4
Dependent Claim
19 words
The control unit for a dental mallet defined by claim 2 wherein said amplitude control means comprises a potentiometer.
Claim 5
Dependent Claim
20 words
The control unit for a dental mallet defined by claim 1 wherein said control rectifier comprises a silicon control rectifier.
Claim 6
Dependent Claim
25 words
The control unit for a dental mallet defined by claim 4 wherein said silicon control rectifier and amplitude control means are coupled to a transformer.
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) | 1978-11-17 | 1979-05-19 | 1979-11-18 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1982-11-17 | 1983-05-19 | 1983-11-18 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1986-11-17 | 1987-05-19 | 1987-11-18 | $7700.00 | Window Closed / Lapsed |