US3726631A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Device for the consecutive ignition of combustion flash-light lamps
Assignee: US Philips Corp
•
Filing: 1970-09-23
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Granted: 1973-04-10
•
Expires: 1990-09-23
Abstract
Abstract In both parallel and series arrangements for the sequential flashing of flash lamps used in conjunction with camera mechanisms, accessible switching means formed as break contacts are provided which assure full utilization of all the bulbs in the arrangement in the event one or more of the bulbs fail to achieve sufficiently high resistance after ignition. The user may actuate the break contact in either series or parallel arrangement so that the remainder of the flash lamps may be utilized in the event one of the lamps fails to operate.
Inventors
- 👤 Graaf W De
- 👤 P Tielemans
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-02 17:31
CPC Classifications
G; G03; G03B; G03B15/00; G03B15/02; G03B15/03; G03B15/04; G03B15/0452; G03B15/0457
Claims Analysis
Total Claims: 5
Claim 1
Independent Claim
145 words
An arrangement for the sequential operation of combustiontype flash light lamps intended for use with a flash-operating camera mechanism comprising: at least two combustion type lamps connected in a series circuit; means for flashing said lamps coupled to the outer terminals of said series circuit; a break contact switching element being responsive to the energy released by a first lamp of said circuit, and also being connected in shunt arrangement with a second lamp of said circuit, said switching element also being external to said camera mechanism and accessible to a user of said mechanism and adapted to being broken by the user in the event said first lamp fails to flash; and means for providing a low ohmic value across the terminals of said first lamp after ignition of said first lamp, said low ohmic means being a resistor permanently shunting said first lamp.
Claim 2
Dependent Claim
145 words
An arrangement for the sequential operation of combustiontype flash light lamps intended for use with a flash-operating camera mechanism comprising: at least two combustion type lamps connected in a series circuit; means for flashing said lamps coupled to the outer terminals of said series circuit; a break contact switching element being responsive to the energy released by a first lamp of said circuit, and also being connected in shunt arrangement with a second lamp of said circuit, said switching element also being external to said camera mechanism and accessible to a user of said mechanism and adapted to being broken by the user in the event said first lamp fails to flash; and means for providing a low ohmic value across the terminals of said first lamp after ignition of said first lamp, said low ohmic means being a resistor permanently shunting said first lamp.
Claim 3
Dependent Claim
34 words
The arrangement as claimed in claim 1 wherein the resistance value of the lamp prior to ignition being 1 ohm and the value of the shunting resistor being between 0.5 ohms and 6 ohms.
Claim 4
Dependent Claim
177 words
An arrangement for the sequential operation of combustion-type flash light bulbs intended for use with a flash-operating camera mechanism comprising: at least two combustion-type lamps connected in a parallel arrangement including first and second legs; means for flashing said lamps coupled to the outer terminals of said parallel circuit; a break contact switching element responsive to the energy released by a first lamp in said first leg of said circuit and also being connected in shunt arrangement with a second lamp in said second leg of said circuit, said switching element also being external to said camera mechanism and accessible to a user of said mechanism and adapted to being broken by the user in the event said first lamp fails to flash; a resistor in series with said second leg for making said second leg of higher ohmic value than said first leg prior to ignition of said first lamp; and switching means, responsive to the energy released by said first lamp, for opening the circuit of said first leg after ignition of said first lamp.
Claim 5
Dependent Claim
177 words
An arrangement for the sequential operation of combustion-type flash light bulbs intended for use with a flash-operating camera mechanism comprising: at least two combustion-type lamps connected in a parallel arrangement including first and second legs; means for flashing said lamps coupled to the outer terminals of said parallel circuit; a break contact switching element responsive to the energy released by a first lamp in said first leg of said circuit and also being connected in shunt arrangement with a second lamp in said second leg of said circuit, said switching element also being external to said camera mechanism and accessible to a user of said mechanism and adapted to being broken by the user in the event said first lamp fails to flash; a resistor in series with said second leg for making said second leg of higher ohmic value than said first leg prior to ignition of said first lamp; and switching means, responsive to the energy released by said first lamp, for opening the circuit of said first leg after ignition of said first lamp.
References Cited (Backward Citations)
US3443875A
Cited
US3562508A
Cited
US3458270A
Cited
US3518487A
Cited
US3544251A
Cited
US3532931A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1976-04-09 | 1976-10-09 | 1977-04-10 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1980-04-09 | 1980-10-09 | 1981-04-10 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1984-04-09 | 1984-10-09 | 1985-04-10 | $7700.00 | Window Closed / Lapsed |