US3593069A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Integrated circuit resistor and method of making the same
Assignee: National Semiconductor Corp
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Filing: 1969-10-08
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Granted: 1971-07-13
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Expires: 1989-10-08
Abstract
Abstract A monolithic integrated circuit diffused resistor and method of making same by diffusing impurities of a first conductivity type into a substrate of a second conductivity type through a mask including a plurality of openings spaced along a line at intervals such that the diffusion through each of the openings overlaps the diffusions through the adjacent openings to provide a string of interconnected diffused regions through which an electrical current may be passed.
Inventors
- 👤 Lee P Madden
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-27 16:53
CPC Classifications
H; H10; H10D; H10D1/00; H10D1/40; H10D1/43; H10P; H10P95/00; Y; Y10; Y10S; Y10S148/00; Y10S148/106; Y10S148/136; Y10S148/145
Claims Analysis
Total Claims: 4
Claim 1
Independent Claim
35 words
A monolithic integrated circuit diffused resistor as recited in claim 1 wherein said regions are aligned along a path between two of said regions, and further comprising electrical interconnect means ohmically contacting said two regions.
Claim 2
Dependent Claim
55 words
In a monolithic integrated circuit including a passive resistance element, the improvement wherein said resistance element comprises a plurality of regions of one conductivity type having adjacent portions of adjacent ones of said regions overlapping each other, the resistivity of said overlapping portions being substantially less than the resistivity of other portions of said regions.
Claim 3
Dependent Claim
87 words
A monolithic integrated circuit diffused resistor comprising: a series of interconnected regions of one conductivity type formed in a semiconductive body of another conductivity type, said regions having side portions overlapping side portions of adjacent regions, the resistivity of each region varying from a relatively high value at said side portions to a relatively low value at the center of said regions; and electrical connector means ohmically contacting remote ones of said regions so that an electrical current may be passed through said series of interconnected regions.
Claim 4
Dependent Claim
92 words
A diffused resistor comprising: a first body of semiconductive material of a first conductivity type; second and third bodies of semiconductive material of a second conductivity type formed adjacent to one another in said first body with adjacent portions of said second and third bodies overlapping one another, the resistivities of said second and third bodies being substantially less in the overlapping portions than in the midportions thereof; and means ohmically contacting said second and third bodies for establishing an electrical path through said overlapping portions of said second and third Bodies.
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) | 1974-07-12 | 1975-01-11 | 1975-07-13 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1978-07-12 | 1979-01-11 | 1979-07-13 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1982-07-12 | 1983-01-11 | 1983-07-13 | $7700.00 | Window Closed / Lapsed |