US4008945A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Ultraviolet-transmitting window for a PROM
Assignee: ISOTRONICS Inc NEW BEDFORD MA A DE CORP
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Filing: 1975-04-17
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Granted: 1977-02-22
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Expires: 1995-04-17
Abstract
Abstract An ultraviolet-transmitting glass window assembly comprising a metallic mounting ring containing an ultraviolet-transmitting glass is made by placing a preformed ultraviolet-transmitting glass member in the center of the metallic ring which has a higher coefficient of thermal expansion than the glass, heating the resulting assembly to melt the glass whereby it completely fills the ring, and cooling the assembly whereby a compression seal is achieved due to the greater shrinkage of the metallic ring. This window assembly is sealed over the memory chip of a programmable read only memory package to provide for ultraviolet erasure of the program information stored in the memory device.
Inventors
- 👤 Jeremy D. Scherer
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-26 04:35
CPC Classifications
G; G11; G11C; G11C16/00; G11C16/02; G11C16/06; G11C16/10; G11C16/18; H; H10; H10W; H10W70/00; H10W70/60; H10W70/67; H10W70/68; H10W70/682
Claims Analysis
Total Claims: 13
Claim 1
Independent Claim
58 words
An ultraviolet-transmitting window assembly comprising a metallic mounting member with an aperture therethrough, and an ultraviolet-transmitting borosilicate glass member positioned within said aperture, said metallic member having a higher coefficient of thermal expansion than said glass member and wherein said glass member is held within the aperture of said metallic member by a fused glass-to-metal hermetic compression seal.
Claim 2
Dependent Claim
58 words
An ultraviolet-transmitting window assembly comprising a metallic mounting member with an aperture therethrough, and an ultraviolet-transmitting borosilicate glass member positioned within said aperture, said metallic member having a higher coefficient of thermal expansion than said glass member and wherein said glass member is held within the aperture of said metallic member by a fused glass-to-metal hermetic compression seal.
Claim 3
Dependent Claim
14 words
The ultraviolet-transmitting window assembly of claim 1 wherein said metallic mounting member is square.
Claim 4
Dependent Claim
14 words
The ultraviolet-transmitting window assembly of claim 1 wherein said metallic mounting member is rectangular.
Claim 5
Dependent Claim
14 words
The ultraviolet-transmitting window assembly of claim 1 wherein said metallic mounting member is circular.
Claim 6
Dependent Claim
12 words
The ultraviolet-transmitting window assembly of claim 1 wherein said aperture is circular.
Claim 7
Dependent Claim
18 words
The ultraviolet-transmitting window assembly of claim 1 wherein said aperture is centrally disposed in said metallic mounting member.
Claim 8
Dependent Claim
28 words
The ultraviolet-transmitting window assembly of claim 1 wherein said borosilicate glass member has a thermal expansion rate from about 37 to about 39 × 10.sup. -7 in/in/° C.
Claim 9
Dependent Claim
78 words
A process for producing an ultraviolet-transmitting window assembly which comprises forming a metallic mounting member with an aperture therethrough, placing a preformed ultraviolet-transmitting borosilicate glass member in said aperture, said metallic member having a higher coefficient of thermal expansion than said glass member, heating the resulting assembly whereby said glass member melts and fills said aperture, and cooling the assembly whereby said metallic mounting member shrinks upon said glass member to form a fused glass-to-metal hermetic compression seal.
Claim 10
Dependent Claim
78 words
A process for producing an ultraviolet-transmitting window assembly which comprises forming a metallic mounting member with an aperture therethrough, placing a preformed ultraviolet-transmitting borosilicate glass member in said aperture, said metallic member having a higher coefficient of thermal expansion than said glass member, heating the resulting assembly whereby said glass member melts and fills said aperture, and cooling the assembly whereby said metallic mounting member shrinks upon said glass member to form a fused glass-to-metal hermetic compression seal.
Claim 11
Dependent Claim
15 words
The process of claim 8 including the additional step of fire polishing the cooled assembly.
Claim 12
Dependent Claim
29 words
The process of claim 8 wherein said preformed glass member is made by melting an ultraviolet-transmitting glass, drawing the glass into a rod, and slicing the rod into discs.
Claim 13
Dependent Claim
27 words
The process of claim 8 wherein said borosilicate glass member has a thermal expansion rate of from about 37 to about 39 × 10.sup. -7 in/in/° C.
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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) | 1980-02-22 | 1980-08-23 | 1981-02-22 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1984-02-22 | 1984-08-23 | 1985-02-22 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1988-02-22 | 1988-08-23 | 1989-02-22 | $7700.00 | Window Closed / Lapsed |