Patent US4267567A successfully refreshed from Google Patents.
US4267567A
Expired / Lapsed
US
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Electric igniter
Assignee: Uhde Inventa Fischer AG
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Filing: 1978-04-10
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Granted: 1981-05-12
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Expires: 1998-04-10
Abstract
Abstract An electric igniter is disclosed which comprises two elements made of electrically conducting material, a body separating the elements and made of electrically insulating material, such as glass or material containing glass, at least one further electrically conducting element arranged on a surface common to the two elements and the body for connecting the two elements electrically, and also a pyrotechnical composition in contact with the surface and the further element. Burning of the composition can be initiated by means of heat developed in the further, initiating element.
Inventors
- 👤 Kurt Nygaard
- 👤 Kjell Mattsson
- 👤 Sven-Erik Bratt
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-03 14:24
CPC Classifications
F; F42; F42B; F42B3/00; F42B3/10; F42B3/103; F42B3/12; F42B3/124
Claims Analysis
Total Claims: 20
Claim 1
Independent Claim
293 words
An improved electric igniter, comprising: a first electrically conductive element having a first end surface; a second electrically coductive element having a second end surface; an electrically insulating body having a third end surface, said body joining and electrically isolating said first and second electrically conductive elements, the coefficients of thermal expansion of said body and said electrically conductive elements being such that the joints between said elements and said body remain tight independent of temperature variations in the range of -40° C. to +60° C., and that said body is clamped between said first and second elements in said temperature range, said first and second elements being formed from a material which has a good wetting effect when contacted by the molten materials of said body; a flat surface extending across and including said end surfaces of said elements and said body; at least one electrically conductive bridge element comprising a layer of electrically conductive material having a thickness of up to 12×10 -8 m., said layer being deposited directly on said flat surface to extend between said end surfaces of said first and second conductive elements and across said end surface of said body and being divided, by grooves extending through said layer to said flat surface, into at least one bar-shaped portion joining a first portion of said layer, said first portion being electrically connected to said first electrically conductive element, to a separate, second portion of said layer, said second portion being electrically connected to said second electrically conductive element; and a pyrotechnical composition directly contacting said bridge element under pressure, whereby when current is passed through said bridge element via said first and second electrically conductive elements, said bridge element generates sufficient heat to ignite said pyrotechnical composition.
Claim 2
Dependent Claim
293 words
An improved electric igniter, comprising: a first electrically conductive element having a first end surface; a second electrically coductive element having a second end surface; an electrically insulating body having a third end surface, said body joining and electrically isolating said first and second electrically conductive elements, the coefficients of thermal expansion of said body and said electrically conductive elements being such that the joints between said elements and said body remain tight independent of temperature variations in the range of -40° C. to +60° C., and that said body is clamped between said first and second elements in said temperature range, said first and second elements being formed from a material which has a good wetting effect when contacted by the molten materials of said body; a flat surface extending across and including said end surfaces of said elements and said body; at least one electrically conductive bridge element comprising a layer of electrically conductive material having a thickness of up to 12×10 -8 m., said layer being deposited directly on said flat surface to extend between said end surfaces of said first and second conductive elements and across said end surface of said body and being divided, by grooves extending through said layer to said flat surface, into at least one bar-shaped portion joining a first portion of said layer, said first portion being electrically connected to said first electrically conductive element, to a separate, second portion of said layer, said second portion being electrically connected to said second electrically conductive element; and a pyrotechnical composition directly contacting said bridge element under pressure, whereby when current is passed through said bridge element via said first and second electrically conductive elements, said bridge element generates sufficient heat to ignite said pyrotechnical composition.
Claim 3
Dependent Claim
20 words
An igniter according to claim 1 wherein said first element is cylindrical and is arranged coaxially around said second element.
Claim 4
Dependent Claim
51 words
An igniter according to claim 2, wherein said bar-shaped portion is located only above said body, and said first portion and said second portion extend across the respective joints between said body and said first and second electrically conductive elements, whereby interruptions of current moving through said bar-shaped portion are minimized.
Claim 5
Dependent Claim
42 words
An igniter according to claim 2, further comprising a surrounding frame within which said first element is coaxially arranged and electrically insulated, whereby electrical connection to said first and second electrically conductive elements may be made without electrical contact with said frame.
Claim 6
Dependent Claim
21 words
An igniter according to claim 1, wherein said first and second electrically conductive elements comprise metal pins encapsulated within said body.
Claim 7
Dependent Claim
51 words
An igniter according to claim 1, wherein said bar-shaped portion is located only above said body, and said first portion and said second portion extend across the respective joints between said body and said first and second electrically conductive elements, whereby interruptions of current moving through said bar-shaped portion are minimized.
Claim 8
Dependent Claim
267 words
An improved electric igniter, comprising: a first electrically conductive element having a hollow cylindrical shape and a first end surface; a second electrically conductive element positioned coaxially within said first electrically conductive element, said second element having a second end surface; an electrically insulating body having a third end surface, said body joining and electrically isolating said first and second electrically conductive elements, the coefficients of thermal expansion of said body and said electrically conductive elements being such that the joints between said elements and said body remain tight independent of temperature variations in the range of -40° C. to +60° C.; a flat surface extending across and including said end surfaces of said elements and said body; at least one electrically conductive bridge element comprising a layer of electrically conductive material having a thickness of up to 12×10 -8 m., said layer being deposited directly on said flat surface to extend between said end surfaces of said first and second conductive elements and across said end surface of said body and being divided, by grooves extending through said layer to said surface, into at least one bar-shaped portion joining a first portion of said layer, said first portion being electrically connected to said first electrically conductive element, to a separate, second portion of said layer, said second portion being electrically connected to said second electrically conductive element; and a pyrotechnical composition directly contacting said bridge element under pressure, whereby when current is passed through said bridge element via said first and second electrically conductive elements, said bridge element generates sufficient heat to ignite said pyrotechnical composition.
Claim 9
Dependent Claim
267 words
An improved electric igniter, comprising: a first electrically conductive element having a hollow cylindrical shape and a first end surface; a second electrically conductive element positioned coaxially within said first electrically conductive element, said second element having a second end surface; an electrically insulating body having a third end surface, said body joining and electrically isolating said first and second electrically conductive elements, the coefficients of thermal expansion of said body and said electrically conductive elements being such that the joints between said elements and said body remain tight independent of temperature variations in the range of -40° C. to +60° C.; a flat surface extending across and including said end surfaces of said elements and said body; at least one electrically conductive bridge element comprising a layer of electrically conductive material having a thickness of up to 12×10 -8 m., said layer being deposited directly on said flat surface to extend between said end surfaces of said first and second conductive elements and across said end surface of said body and being divided, by grooves extending through said layer to said surface, into at least one bar-shaped portion joining a first portion of said layer, said first portion being electrically connected to said first electrically conductive element, to a separate, second portion of said layer, said second portion being electrically connected to said second electrically conductive element; and a pyrotechnical composition directly contacting said bridge element under pressure, whereby when current is passed through said bridge element via said first and second electrically conductive elements, said bridge element generates sufficient heat to ignite said pyrotechnical composition.
Claim 10
Dependent Claim
57 words
An igniter according to claim 7, wherein said coefficients of expansion are chosen so that said insulating body is clamped between said first and second elements in said temperature range, and said first and second elements are formed from a material which has a good wetting effect when contacted by the molten material of said insulating body.
Claim 11
Dependent Claim
42 words
An igniter according to claim 7, further comprising a surrounding frame within which said first element is coaxially arranged and electrically insulated, whereby electrical connection to said first and second electrically conductive elements may be made without electrical contact with said frame.
Claim 12
Dependent Claim
21 words
An igniter according to claim 7, wherein said first and second electrically conductive elements comprise metal pins encapsulated within said body.
Claim 13
Dependent Claim
51 words
An igniter according to claim 7, wherein said bar-shaped portion is located only above said body, and said first portion and said second portion extend across the respective joints between said body and said first and second electrically conductive elements, whereby interruptions of current moving through said bar-shaped portion are minimized.
Claim 14
Dependent Claim
251 words
An improved electric igniter, comprising: a first electrically conductive element having a first end surface; a second electrically conductive element having a second end surface; an electrically insulating body having a third end surface, said body joining and electrically isolating said first and second electrically conductive elements, the coefficients of thermal expansion of said body and said electrically conductive elements being such that the joints between said elements and said body remain tight independent of temperature variations in the range of -40° C. to +60° C.; a flat surface extending across and including said end surfaces of said elements and said body; at least one electrically conductive bridge element comprising a layer of electrically conductive material having a thickness of up to 12×10 -8 m., said layer being deposited directly on said flat surface to extend between said end surfaces of said first and second conductive elements and across said end surface of said body and being divided, by grooves extending through said layer to said surface, into at least one bar-shaped portion joining a first portion of said layer, said first portion being electrically connected to said first electrically conductive element, to a separate, second portion of said layer, said second portion being electrically connected to said second electrically conductive element; and a pyrotechnical composition directly contacting said bridge element under pressure, whereby when current is passed through said bridge element via said first and second electrically conductive elements, said bridge element generates sufficient heat to ignite said pyrotechnical composition.
Claim 15
Dependent Claim
251 words
An improved electric igniter, comprising: a first electrically conductive element having a first end surface; a second electrically conductive element having a second end surface; an electrically insulating body having a third end surface, said body joining and electrically isolating said first and second electrically conductive elements, the coefficients of thermal expansion of said body and said electrically conductive elements being such that the joints between said elements and said body remain tight independent of temperature variations in the range of -40° C. to +60° C.; a flat surface extending across and including said end surfaces of said elements and said body; at least one electrically conductive bridge element comprising a layer of electrically conductive material having a thickness of up to 12×10 -8 m., said layer being deposited directly on said flat surface to extend between said end surfaces of said first and second conductive elements and across said end surface of said body and being divided, by grooves extending through said layer to said surface, into at least one bar-shaped portion joining a first portion of said layer, said first portion being electrically connected to said first electrically conductive element, to a separate, second portion of said layer, said second portion being electrically connected to said second electrically conductive element; and a pyrotechnical composition directly contacting said bridge element under pressure, whereby when current is passed through said bridge element via said first and second electrically conductive elements, said bridge element generates sufficient heat to ignite said pyrotechnical composition.
Claim 16
Dependent Claim
51 words
An igniter according to claim 12, wherein said bar-shaped portion is located only above said body, and said first portion and said second portion extend across the respective joints between said body and said first and second electrically conductive elements, whereby interruptions of current moving through said bar-shaped portion are minimized.
Claim 17
Dependent Claim
42 words
An igniter according to claim 12, further comprising a surrounding frame within which said first element is coaxially arranged and electrically insulated, whereby electrical connection to said first and second electrically conductive elements may be made without electrical contact with said frame.
Claim 18
Dependent Claim
21 words
An igniter according to claim 12, wherein said first and second electrically conductive elements comprise metal pins encapsulated within said body.
Claim 19
Dependent Claim
209 words
An improved electric igniter, comprising: a first electrically conductive element having a first end surface; a second electrically conductive element having a second end surface; an electrically insulating body having a third end surface, said body joining and electrically isolating said first and second electrically conductive elements, the coefficients of thermal expansion of said body and said electrically conductive elements being such that the joints between said elements and said body remain tight independent of temperature variations in the range of -40° C. to +60° C.; a flat surface extending across and including said end surfaces of said elements and said body; at least one electrically conductive bridge element comprising a lower layer of chromium deposited on said flat surface by vacuum vaporization with a thickness of about 2×10 -8 m. and an upper layer of gold similarly deposited with a thickness of about 1×10 -7 m., said bridge element extending between said end surfaces of said first and second conductive elements and across said end surface of said body; and a pyrotechnical composition directly contacting said bridge element under pressure, whereby when current is passed through said bridge element via said first and second electrically conductive elements, said bridge element generates sufficient heat to ignite said pyrotechnical composition.
Claim 20
Dependent Claim
209 words
An improved electric igniter, comprising: a first electrically conductive element having a first end surface; a second electrically conductive element having a second end surface; an electrically insulating body having a third end surface, said body joining and electrically isolating said first and second electrically conductive elements, the coefficients of thermal expansion of said body and said electrically conductive elements being such that the joints between said elements and said body remain tight independent of temperature variations in the range of -40° C. to +60° C.; a flat surface extending across and including said end surfaces of said elements and said body; at least one electrically conductive bridge element comprising a lower layer of chromium deposited on said flat surface by vacuum vaporization with a thickness of about 2×10 -8 m. and an upper layer of gold similarly deposited with a thickness of about 1×10 -7 m., said bridge element extending between said end surfaces of said first and second conductive elements and across said end surface of said body; and a pyrotechnical composition directly contacting said bridge element under pressure, whereby when current is passed through said bridge element via said first and second electrically conductive elements, said bridge element generates sufficient heat to ignite said pyrotechnical composition.
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USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1984-05-11 | 1984-11-10 | 1985-05-12 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1988-05-11 | 1988-11-10 | 1989-05-12 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1992-05-11 | 1992-11-10 | 1993-05-12 | $7700.00 | Window Closed / Lapsed |