Patent US3721172A successfully refreshed from Google Patents.
US3721172A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Capping shutter with explosive charge of carbon powder
Assignee: Impulsphysik GmbH
•
Filing: 1970-11-24
•
Granted: 1973-03-20
•
Expires: 1990-11-24
Abstract
Abstract A shutter comprises a frame of elastomeric material which bounds an opening for the passage of light. A pair of parallel transparent plates are sealingly accommodated in the frame exteriorly across the opening and define between themselves and with the frame an internal chamber. One or more shutter-closing units are embedded in the frame and each include a housing or shell having an open side communicating with the camber, a charge of carbon powder accommodated in the open shell with a frangible layer extending across the open side to retain the carbon powder in the shell until the time of operation, and an explosive charge which can be triggered electrically and which blows the carbon powder into the chamber to thereby close the shutter, that is prevent further passage of light through the opening.
Inventors
- 👤 F Frungel
- 👤 H Lohse
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-05 14:38
CPC Classifications
G; G03; G03B; G03B9/00; G03B9/08
Claims Analysis
Total Claims: 21
Claim 1
Independent Claim
17 words
A shutter as defined in claim 1, wherein said frame consists at least predominantly of synthetic rubber.
Claim 2
Dependent Claim
17 words
A shutter as defined in claim 1, wherein said frame consists at least predominantly of silicone rubber.
Claim 3
Dependent Claim
15 words
A shutter as defined in claim 1, wherein said plates consist of synthetic plastic material.
Claim 4
Dependent Claim
13 words
A shutter as defined in claim 4, wherein said plates consist of Plexiglas.
Claim 5
Dependent Claim
13 words
A shutter as defined in claim 4, wherein said plates consist of Macrolon.
Claim 6
Dependent Claim
17 words
A shutter as defined in claim 1; wherein said injecting means comprises an electrically ignitable explosive charge.
Claim 7
Dependent Claim
32 words
A shutter as defined in claim 7; and further comprising electrical conductors embedded in said frame and connected with said explosive charge for connecting the same with a source of electrical energy.
Claim 8
Dependent Claim
33 words
A shutter as defined in claim 8; further comprising a connector also embedded in said frame and conductively connected with said electrical conductors, said connector being accessible at the exterior of said frame.
Claim 9
Dependent Claim
21 words
A shutter as defined in claim 1; and further comprising an electrically conductive additive in said elastomeric material of said frame.
Claim 10
Dependent Claim
12 words
A shutter as defined in claim 10, wherein said additive is graphite.
Claim 11
Dependent Claim
27 words
A shutter as defined in claim 1, said frame being of profiled cross-section and having circumferentially extending shoulders surrounding said opening and sealingly engaging the respective plates.
Claim 12
Dependent Claim
60 words
A shutter as defined in claim 1, said means further comprising a hollow shell having an open side facing and communicating with said chamber, said charge of carbon powder being accommodated in the interior of said shell; and a frangible web extending across said open side for retaining said carbon powder in said shell until operation of said injecting means.
Claim 13
Dependent Claim
40 words
A shutter as defined in claim 1, said means for terminating the passage of light further comprising at least one additional unit similar to the first-mentioned unit and also accommodated in said frame but circumferentially spaced from said first-mentioned unit.
Claim 14
Dependent Claim
119 words
A shutter comprising a frame of elastomeric material bounding an opening for the passage of light and having an outer circumferential marginal portion; at least two spaced apart at least substantially parallel transparent plates extending across said opening and defining between themselves an internal chamber; an annular retaining element of inwardly open U-shaped cross-section surrounding said frame and embracing said circumferential marginal portion in a sense urging said plates into sealing engagement with said frame; and means for terminating the passage of light through said opening, said means comprising at least one unit accommodated in said frame and including a charge of carbon powder and injecting means operable for injecting said carbon powder at high speed into said chamber.
Claim 15
Dependent Claim
18 words
A shutter as defined in claim 15, wherein said retaining element consists at least predominantly of metallic material.
Claim 16
Dependent Claim
19 words
A shutter as defined in claim 15, wherein said retaining element consists at least predominantly of synthetic plastic material.
Claim 17
Dependent Claim
21 words
A shutter as defined in claim 15, wherein said retaining element consists at least predominantly of glass-fiber reinforced synthetic plastic material.
Claim 18
Dependent Claim
63 words
A shutter as defined in claim 15, said retaining element having a circumferential edge face extending in at least substantial parallelism with the axis of said opening; and further comprising a reinforcing member encircling said retaining element and tightly engaging said edge face for reinforcing said element against outwardly directed forces liberated in said chamber in response to operation of said injecting means.
Claim 19
Dependent Claim
108 words
A shutter, comprising a frame of elastomeric material bounding an opening for the passage of light; at least three spaced apart parallel transparent plates sealingly accommodated in said frame, extending across said opening and defining between themselves at least two internal parallel chambers; and means for terminating the passage of light through said opening, said means comprising at least one unit embedded at least partially in said frame and including a charge of carbon powder and injecting means operable for simultaneously injecting some of said carbon powder at high speed into one of said chambers and the remainder of said carbon powder into the other of said chambers.
Claim 20
Dependent Claim
28 words
A shutter as defined in claim 20 wherein the middle plate is mounted symmetrically between the two other plates so that said carbon powder blackens four plates simultaneously.
Claim 21
Dependent Claim
130 words
A shutter, comprising a frame bounding an opening for the passage of light; at least two spaced apart substantially parallel transparent plates sealingly connected with said frame extending across said opening and defining between themselves an internal chamber, one of said plates normally facing the incoming light, and at least said one plate being of laminar construction and comprising at least one layer of a material highly resistant to heat and at least one additional layer resistant to and slightly yieldable under the influence of pressure; and means for terminating the passage of light through said opening, said means comprising at least one unit accommodated in said frame and including a charge of carbon powder and injecting means operable for injecting said carbon powder at high speed into said chamber.
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) | 1976-03-19 | 1976-09-18 | 1977-03-20 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1980-03-19 | 1980-09-18 | 1981-03-20 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1984-03-19 | 1984-09-18 | 1985-03-20 | $7700.00 | Window Closed / Lapsed |