US3650435A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Photoelectric controlled dispenser
Assignee: Calgon Corp
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Filing: 1970-04-03
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Granted: 1972-03-21
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Expires: 1990-04-03
Abstract
Abstract A device is disclosed for dispensing materials such as detergents without manual control. It is operated by blocking the passage of light to one of two photoelectric cells, as by a hand, which actuates an SCR circuit. The pump is turned off automatically preferably by a pulse generating circuit which interrupts the SCR. The two photocells are connected in series and together function as a voltage divider, comparing ambient light to proximate light.
Inventors
- 👤 William E Kleefeld
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-29 10:42
CPC Classifications
H; H03; H03K; H03K17/00; H03K17/51; H03K17/78; H03K17/79; H03K17/56; H03K17/72; H03K17/73
Claims Analysis
Total Claims: 4
Claim 1
Independent Claim
57 words
A material dispenser comprising two photocells adapted to be connected in series across a DC power source and forming a variable voltage divider, a silicon-controlled rectifier responsive to current coming directly from said variable voltage divider, means responsive to current from said silicon-controlled rectifier for dispensing material, and turnoff means for ceasing operation of the dispensing means.
Claim 2
Dependent Claim
57 words
A material dispenser comprising two photocells adapted to be connected in series across a DC power source and forming a variable voltage divider, a silicon-controlled rectifier responsive to current coming directly from said variable voltage divider, means responsive to current from said silicon-controlled rectifier for dispensing material, and turnoff means for ceasing operation of the dispensing means.
Claim 3
Dependent Claim
20 words
Dispenser of claim 1 in which the turnoff means comprise a capacitor-actuated unijunction transistor and a silicon-controlled rectifier responsive thereto.
Claim 4
Dependent Claim
18 words
Dispenser of claim 1 in which the means responsive to current from the silicon-controlled rectifier is a pump.
References Cited (Backward Citations)
US3273752A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1975-03-21 | 1975-09-20 | 1976-03-21 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1979-03-21 | 1979-09-20 | 1980-03-21 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1983-03-21 | 1983-09-20 | 1984-03-21 | $7700.00 | Window Closed / Lapsed |