US3627459A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Flashbulb
Assignee: US Philips Corp
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Filing: 1970-02-19
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Granted: 1971-12-14
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Expires: 1990-02-19
Abstract
Abstract A flashbulb of the combustible type for ignition by means of a voltage increasing to a maximum value within a short period, the ignition mass being provided in a cavity in a body of electrically insulating material which encompasses and shields the current conductors within the envelope. The invention relates to a flashbulb including an envelope of light-transmitting material within which an actinically combustible material, a gas maintaining the combustion and a stem are provided; the stem comprises two current conductors sealed in the lamp base and fixed relatively to each other within the envelope by means of a body of electrically insulating material. On the insulating material there is provided an ignition mass which connects the ends of the current conductors and is ignited by electric breakdown and subsequently burns explosively when a voltage is set up across the ends. Due to the explosively burning paste, the reaction between the actinically combustible material and the gas maintaining the combustion is initiated.
Inventors
- 👤 Johannes Cornelis Van Der Tas
- 👤 Charles Cornelis Edu Meulemans
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-08 13:41
CPC Classifications
G; G03; G03B; G03B15/00; G03B15/02; G03B15/03; G03B15/04; G03B15/0452; G03B15/0457; F; F21; F21K; F21K5/00; F21K5/02
Claims Analysis
Total Claims: 12
Claim 1
Independent Claim
130 words
A flashlamp comprising a light-transmitting envelope having walls which define a bulb with a hollow interior, with one wall formed as the base of the bulb, an electric insulating member having one part closely adjacent the base and a remote part extending into the interior of said bulb, an ignition mass on said remote part, two spaced current conductors, each having a central part extending through the base and electric insulating member with a first end part extending external of the base and a second end part extending through said remote part and connected to said ignition mass, whereby said central parts are shielded from said interior of the bulb, the lamp further comprising a a quantity of actinically combustible material and a gas for supporting combustion within said bulb.
Claim 2
Dependent Claim
130 words
A flashlamp comprising a light-transmitting envelope having walls which define a bulb with a hollow interior, with one wall formed as the base of the bulb, an electric insulating member having one part closely adjacent the base and a remote part extending into the interior of said bulb, an ignition mass on said remote part, two spaced current conductors, each having a central part extending through the base and electric insulating member with a first end part extending external of the base and a second end part extending through said remote part and connected to said ignition mass, whereby said central parts are shielded from said interior of the bulb, the lamp further comprising a a quantity of actinically combustible material and a gas for supporting combustion within said bulb.
Claim 3
Dependent Claim
22 words
A flashlamp according to claim 1 wherein the electrically insulating material has a hollow space through which the current conductors are passed.
Claim 4
Dependent Claim
34 words
A flashlamp according to claim 1 wherein the electrically insulating material has a hollow space through which the current conductors are passed, which space is in open communication with the interior of the envelope.
Claim 5
Dependent Claim
47 words
A flashlamp according to claim 1 wherein the remote part of said electrically insulating material has a cavity for accommodating the ignition mass and said cavity includes a groove which is directed transversely to an imaginary line of connection between the first ends of the current conductors.
Claim 6
Dependent Claim
26 words
A flashlamp according to claim 4 wherein said cavity has a groove coinciding with an imaginary line of connection between the ends of the current conductors.
Claim 7
Dependent Claim
18 words
A device according to claim 1 wherein said insulating member is a glass tube formed as a stem.
Claim 8
Dependent Claim
72 words
A magazine provided with a plurality of electrically parallel arranged flashbulbs which can be ignited one by one in an arbitrary sequence by setting up across the flashbulbs a voltage increasinG within a short period to a maximum value when the shutter of a camera to which the magazine is connected is opened, characterized in that the magazine comprises a plurality of flashbulbs of the combustible type as claimed in claim 8.
Claim 9
Dependent Claim
124 words
A flashlamp comprising a light-transmitting envelope having walls which define a bulb with a hollow interior, with one wall formed as the base of the bulb, an electric insulating member having one part closely adjacent the base and a remote part extending into said interior, an ignition mass on said remote part, said member and base defining a passage shielded from the said interior part of the bulb, two spaced current conductors, each having a central part extending through said passage with a first end part extending external of the base and a second end part extending through said remote part of the insulating member and connected to said ignition mass, and actinically combustible material and a gas for supporting combustion within said bulb.
Claim 10
Dependent Claim
124 words
A flashlamp comprising a light-transmitting envelope having walls which define a bulb with a hollow interior, with one wall formed as the base of the bulb, an electric insulating member having one part closely adjacent the base and a remote part extending into said interior, an ignition mass on said remote part, said member and base defining a passage shielded from the said interior part of the bulb, two spaced current conductors, each having a central part extending through said passage with a first end part extending external of the base and a second end part extending through said remote part of the insulating member and connected to said ignition mass, and actinically combustible material and a gas for supporting combustion within said bulb.
Claim 11
Dependent Claim
113 words
A flashlamp comprising glass envelope having walls which define a bulb with a hollow interior, with one wall formed as the base of the bulb, a glass tube having one part adjacent the base and a remote part extending into said interior, an ignition mass on said remote part, two spaced current conductors, each having a central part extending through the base and the tube with a first end part extending external of the base and a second end part extending through said remote part and connected to said ignition mass, whereby said central parts are shielded from said interior, and actinically combustible material and a gas for supporting combustion within said bulb.
Claim 12
Dependent Claim
113 words
A flashlamp comprising glass envelope having walls which define a bulb with a hollow interior, with one wall formed as the base of the bulb, a glass tube having one part adjacent the base and a remote part extending into said interior, an ignition mass on said remote part, two spaced current conductors, each having a central part extending through the base and the tube with a first end part extending external of the base and a second end part extending through said remote part and connected to said ignition mass, whereby said central parts are shielded from said interior, and actinically combustible material and a gas for supporting combustion within said 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) | 1974-12-13 | 1975-06-14 | 1975-12-14 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1978-12-13 | 1979-06-14 | 1979-12-14 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1982-12-13 | 1983-06-14 | 1983-12-14 | $7700.00 | Window Closed / Lapsed |