US3984860A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Multi-function LSI wafers
Assignee: International Business Machines Corp
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Filing: 1974-12-13
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Granted: 1976-10-05
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Expires: 1994-12-13
Abstract
Abstract A system that is to be placed on a wafer is partitioned into reasonably large functions, each provided with a set of I/O and power pads. The wafer design is called "design A"0 A second wafer design (design B) that is the mirror image of design A is also constructed. Wafers of designs A and B are tested and divided into two groups: group I wafers have relatively few functions that are inoperative; group II wafers have relatively few functions that are operative. Inoperative functions are removed from group I wafers and discarded; good functions are removed from group II wafers and retained. A given function on wafer A is the mirror image of the same function on wafer B. Therefore, a given function from a group II wafer A (or B) can be inverted and attached to a group I wafer B (or A) that has had the corresponding function removed from it. The I/O and power pads of the function removed from the group II wafer are joined to the I/O and power pads remaining on the group I wafer.
Inventors
- 👤 Joseph C. Logue
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-26 19:33
CPC Classifications
H; H10; H10D; H10D84/00; H10D84/90
Claims Analysis
Total Claims: 6
Claim 1
Independent Claim
71 words
A multi-function, multi-island, wafer, comprising: a first island which is electrically isolated from input-output connections to the other islands of said wafer; and a second island that, with respect to certain input-output connections, is the mirror image of said first island; said second island having said certain input-output connections electrically connected to corresponding input-output connections related to said first island; said second island thereby replacing said first island on said wafer.
Claim 2
Dependent Claim
71 words
A multi-function, multi-island, wafer, comprising: a first island which is electrically isolated from input-output connections to the other islands of said wafer; and a second island that, with respect to certain input-output connections, is the mirror image of said first island; said second island having said certain input-output connections electrically connected to corresponding input-output connections related to said first island; said second island thereby replacing said first island on said wafer.
Claim 3
Dependent Claim
20 words
The multi-function, multi-island, wafer of claim 1 wherein: said first is electrically isolated from said wafer by physical removal therefrom.
Claim 4
Dependent Claim
160 words
As an article of manufacture, materials for manufacturing a multi-function, multi-island, wafer, comprising: wafers manufactured in accordance with a first design; wafer islands manufactured in accordance with a second design; said first and second designs being related in that each island of said second design is, with respect to input-output pads, the mirror image of an island of similar function of said first design; a group of wafers, sorted from said manufactured wafers, each containing at least one island that is not satisfactory for use; said one island being electrically isolated from the other islands of a wafer in said group while leaving its associated input-output pads connected to the other islands of the wafer; said one island on said wafer being replaced by electrically connecting the input-output pads associated with an island of similar function, manufactured in accordance with said second design, to the input-output pads associated with said one island that was electrically isolated from said first wafer.
Claim 5
Dependent Claim
160 words
As an article of manufacture, materials for manufacturing a multi-function, multi-island, wafer, comprising: wafers manufactured in accordance with a first design; wafer islands manufactured in accordance with a second design; said first and second designs being related in that each island of said second design is, with respect to input-output pads, the mirror image of an island of similar function of said first design; a group of wafers, sorted from said manufactured wafers, each containing at least one island that is not satisfactory for use; said one island being electrically isolated from the other islands of a wafer in said group while leaving its associated input-output pads connected to the other islands of the wafer; said one island on said wafer being replaced by electrically connecting the input-output pads associated with an island of similar function, manufactured in accordance with said second design, to the input-output pads associated with said one island that was electrically isolated from said first wafer.
Claim 6
Dependent Claim
21 words
The article of manufacture of claim 3 wherein: said one island is electrically isolated from said wafer by physical removal therefrom.
References Cited (Backward Citations)
US3707655A
Cited
US3757175A
Cited
US3795972A
Cited
US3795974A
Cited
US3746973A
Cited
US3795845A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1979-10-05 | 1980-04-05 | 1980-10-05 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1983-10-05 | 1984-04-05 | 1984-10-05 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1987-10-05 | 1988-04-05 | 1988-10-05 | $7700.00 | Window Closed / Lapsed |