US4460915A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Plastic package for radiation sensitive semiconductor devices
Assignee: Intel Corp
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Filing: 1981-12-28
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Granted: 1984-07-17
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Expires: 2001-12-28
Abstract
Abstract A plastic package for radiation sensitive electrically programmable read-only memory devices is disclosed. A "slug" of ultraviolet transmissive material, such as fused quartz, sapphire, or other suitable material is bonded to the radiation sensitive surface of the semiconductor chip. The chip is wire bonded and die attached in the conventional manner, and is then encapsulated within a shell using existing epoxy techniques. The slug is shaped such that its upper surface is not covered during the encapsulating process, and thus ultraviolet radiation can penetrate through the slug and be diffused onto the chip thereby erasing the memory cells.
Inventors
- 👤 Paul R. Engel
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-24 05:31
CPC Classifications
H; H10; H10F; H10F39/00; H10F39/10; H10F39/107; G; G11; G11C; G11C16/00; G11C16/02; G11C16/06; G11C16/10; G11C16/18
Claims Analysis
Total Claims: 5
Claim 1
Independent Claim
124 words
A plastic package for a programmable read-only memory device, comprising: a radiation transmissive member suitably transmissive to a desired wave-length of electromagnetic radiation, in contact with a radiation sensitive surface of said semiconductor device; said radiation transmissive member comprising: a guide portion including an exterior face; a base portion integrally coupled to said guide portion including a first surface in contact with said radiation sensitive surface; an opaque encapsulating plastic shell surrounding said device; said guide portion being sized so as to be visible on a surface of said shell, and to provide a radiation transmissive passage through said shell to said radiation sensitive surface; whereby radiation incident on said shell passes through said member and onto said radiation sensitive surface of said device.
Claim 2
Dependent Claim
124 words
A plastic package for a programmable read-only memory device, comprising: a radiation transmissive member suitably transmissive to a desired wave-length of electromagnetic radiation, in contact with a radiation sensitive surface of said semiconductor device; said radiation transmissive member comprising: a guide portion including an exterior face; a base portion integrally coupled to said guide portion including a first surface in contact with said radiation sensitive surface; an opaque encapsulating plastic shell surrounding said device; said guide portion being sized so as to be visible on a surface of said shell, and to provide a radiation transmissive passage through said shell to said radiation sensitive surface; whereby radiation incident on said shell passes through said member and onto said radiation sensitive surface of said device.
Claim 3
Dependent Claim
16 words
The plastic package of claim 1 wherein said radiation transmissive member is transmissive to ultraviolet radiation.
Claim 4
Dependent Claim
23 words
The plastic package of claim 2, wherein said transmissive member is bonded to said semiconductor device by a film of ultraviolet transparent adhesive.
Claim 5
Dependent Claim
17 words
The plastic package of claim 3, wherein said radiation transmissive member is comprised of ultraviolet transmissive glass.
References Cited (Backward Citations)
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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) | 1987-07-17 | 1988-01-16 | 1988-07-17 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1991-07-17 | 1992-01-16 | 1992-07-17 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1995-07-17 | 1996-01-16 | 1996-07-17 | $7700.00 | Window Closed / Lapsed |