Patent US3783338A successfully refreshed from Google Patents.
US3783338A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Electronic flash lighting equipment
Assignee: Bowens Sales and Service Ltd
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Filing: 1972-05-18
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Granted: 1974-01-01
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Expires: 1992-05-18
Abstract
Abstract An electronic flash unit comprising an electronic flash tube, a modelling light, and a power supply and triggering arrangement for the flash tube, in which the said arrangement is coupled to the circuit supplying the modelling light in such a way that triggering of the electronic tube will, at least for a space of time thereafter, modify the light output of the modelling light.
Inventors
- 👤 K Bowen
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-09 15:39
CPC Classifications
H; H05; H05B; H05B41/00; H05B41/14; H05B41/30; H05B41/32
Claims Analysis
Total Claims: 6
Claim 1
Independent Claim
73 words
An electronic flash unit comprising an electronic flash tube, a modeling light, a power supply and triggering arrangement for the flash tube, said triggering arrangement including means coupled to a circuit supplying the modeling light and being operative in response to the triggering of said electronic flash tube to modify the light output of the modeling light, at least for a predetermined length of time after the triggering of said electronic flash tube.
Claim 2
Dependent Claim
73 words
An electronic flash unit comprising an electronic flash tube, a modeling light, a power supply and triggering arrangement for the flash tube, said triggering arrangement including means coupled to a circuit supplying the modeling light and being operative in response to the triggering of said electronic flash tube to modify the light output of the modeling light, at least for a predetermined length of time after the triggering of said electronic flash tube.
Claim 3
Dependent Claim
49 words
An electronic flash unit in accordance with claim 1 in which said triggering arrangement is coupled to a circuit supplying the modeling light by means of a relay energized by said triggering circuit arrangement and being provided with contacts in circuit relationship in the circuit supplying the modeling light.
Claim 4
Dependent Claim
57 words
An electronic flash unit in accordance with claim 2 wherein said relay is connected in series with a controlled rectifier device, said controlled rectifier device being adapted to be switched on energizing the relay to close the contacts of said relay only when a predetermined voltage is reached in a storage capacitor in said power supply arrangement.
Claim 5
Dependent Claim
26 words
An electronic flash unit in accordance with claim 1 including means for switching off the modeling light in response to triggering of the electronic flash tube.
Claim 6
Dependent Claim
25 words
An electronic flash unit in accordance with claim 1 including means for dimming the modeling light in response to triggering of the electronic flash tube.
References Cited (Backward Citations)
US3366835A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1976-12-31 | 1977-07-02 | 1978-01-01 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1980-12-31 | 1981-07-02 | 1982-01-01 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1984-12-31 | 1985-07-02 | 1986-01-01 | $7700.00 | Window Closed / Lapsed |