US3728067A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Device for flashing combustion flash bulbs one after the other
Assignee: US Philips Corp
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Filing: 1970-09-23
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Granted: 1973-04-17
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Expires: 1990-09-23
Abstract
Abstract The invention relates to a device for flashing flash bulbs one after the other. In a device according to the invention the flash bulbs are arranged in series, and a bulb is shunted by a make contact which reacts to the radiation heat which is released when said lamp is flashed.
Inventors
- 👤 Graaf W De
- 👤 P Waltherus
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-27 12:20
CPC Classifications
G; G03; G03B; G03B15/00; G03B15/02; G03B15/03; G03B15/04; G03B15/0452; G03B15/0457; F; F21; F21K; F21K5/00; F21K5/02; F21K5/023
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
172 words
An electrical arrangement for the sequential operation of flash bulbs in series comprising: at least two combustion flash bulb units connected in a series circuit; means for flashing said bulb coupled to the outer terminals of said series circuit; a first switching element, one of said bulb units being electrically connected in shunt arrangement with said first switching element, said first switching element being formed as a ''''make'''' contact and also being juxtaposed and physically responsive to energy released by said bulb upon flashing, whereby the first bulb upon flashing causes the switching element to ''''make'''' thereby effecting electrical coupling of remaining bulbs to said flashing means; a second switching element which is also responsive to the energy released by said first bulb upon flashing, said second switching element also being connected in series arrangement with a second one of said series connected bulbs, said second switching element also formed as a ''''make'''' element; and a resistor connected in shunt with the series arrangement of said second ''''make'''' element and second bulb.
Claim 2
Dependent Claim
172 words
An electrical arrangement for the sequential operation of flash bulbs in series comprising: at least two combustion flash bulb units connected in a series circuit; means for flashing said bulb coupled to the outer terminals of said series circuit; a first switching element, one of said bulb units being electrically connected in shunt arrangement with said first switching element, said first switching element being formed as a ''''make'''' contact and also being juxtaposed and physically responsive to energy released by said bulb upon flashing, whereby the first bulb upon flashing causes the switching element to ''''make'''' thereby effecting electrical coupling of remaining bulbs to said flashing means; a second switching element which is also responsive to the energy released by said first bulb upon flashing, said second switching element also being connected in series arrangement with a second one of said series connected bulbs, said second switching element also formed as a ''''make'''' element; and a resistor connected in shunt with the series arrangement of said second ''''make'''' element and second bulb.
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) | 1976-04-16 | 1976-10-16 | 1977-04-17 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1980-04-16 | 1980-10-16 | 1981-04-17 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1984-04-16 | 1984-10-16 | 1985-04-17 | $7700.00 | Window Closed / Lapsed |