Patent US3250693A successfully refreshed from Google Patents.
US3250693A
Expired / Lapsed
US
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Method and apparatus for the manufacturing calibration of tunnel diodes by etching
Assignee: Sony Corp
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Filing: 1961-06-05
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Granted: 1966-05-10
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Expires: 1981-06-05
Abstract
No abstract record available.
Inventors
- 👤 Amaya Akio
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-28 14:15
CPC Classifications
H; H10; H10P; H10P50/00; H10P50/60; H10P50/61; H10P50/613; C; C25; C25F; C25F3/00; C25F3/02; C25F3/12; H10D; H10D99/00; H10P50/64; H10P50/642; H10P50/644
Claims Analysis
Total Claims: 6
Claim 1
Independent Claim
68 words
THE METHOD OF ETCHING A TUNNEL DIODE TO ACHEIVE A PREDETERMINED PEAK CURRENT CHARACTERISTIC IN THE DIODE WHICH COMPRISES IMMERSING SAID DIODE IN AN ETCHANT, PERIODICALLY PASSING A PULSATING CHECKING CURRENT IN THE FORWARD DIRECTION THROUGH SAID DIODE WHILE SO IMMERSED, SENSING THE VOLTAGE ACROSS SAID DIODE AS ETCHING PROCEEDS, AND TERMINATING THE ETCHING IMMEDIATELY WHEN SAID VOLTAGE JUMPS THROUGH THE SWITCHING REGION CHARACTERISTIC OF A TUNNEL DIODE.
Claim 2
Independent Claim
68 words
THE METHOD OF ETCHING A TUNNEL DIODE TO ACHEIVE A PREDETERMINED PEAK CURRENT CHARACTERISTIC IN THE DIODE WHICH COMPRISES IMMERSING SAID DIODE IN AN ETCHANT, PERIODICALLY PASSING A PULSATING CHECKING CURRENT IN THE FORWARD DIRECTION THROUGH SAID DIODE WHILE SO IMMERSED, SENSING THE VOLTAGE ACROSS SAID DIODE AS ETCHING PROCEEDS, AND TERMINATING THE ETCHING IMMEDIATELY WHEN SAID VOLTAGE JUMPS THROUGH THE SWITCHING REGION CHARACTERISTIC OF A TUNNEL DIODE.
Claim 3
Independent Claim
74 words
THE METHOD OF ETCHING A TUNNEL DIODE TO ACHIEVE A PREDETERMINED CURRENT CHARACTERISTIC IN THE DIODE WHICH COMPRISES IMMERSING SAID DIODE INTO AN ELECTROLYTIC ETCHING SOLUTION, ALTERNATELY APPLYING DIRECT CURRENT CHECKING PULSES TO SAID DIODE IN THE FORWARD DIRECTION AND DIRECT CURRENT ETCHING PULSES THROUGH SAID SOLUTION, SENSING THE VOLTAGE ACROSS SAID DIODE AS ETCHING PROCEEDS, AND TERMINATING THE ETCHING IMMEDIATELY WHEN SAID VOLTAGE JUMPS THROUGH THE SWITCHING REGION CHARACTERISTIC OF A TUNNEL DIODE.
Claim 4
Independent Claim
74 words
THE METHOD OF ETCHING A TUNNEL DIODE TO ACHIEVE A PREDETERMINED CURRENT CHARACTERISTIC IN THE DIODE WHICH COMPRISES IMMERSING SAID DIODE INTO AN ELECTROLYTIC ETCHING SOLUTION, ALTERNATELY APPLYING DIRECT CURRENT CHECKING PULSES TO SAID DIODE IN THE FORWARD DIRECTION AND DIRECT CURRENT ETCHING PULSES THROUGH SAID SOLUTION, SENSING THE VOLTAGE ACROSS SAID DIODE AS ETCHING PROCEEDS, AND TERMINATING THE ETCHING IMMEDIATELY WHEN SAID VOLTAGE JUMPS THROUGH THE SWITCHING REGION CHARACTERISTIC OF A TUNNEL DIODE.
Claim 5
Independent Claim
73 words
AN APPARATUS FOR ETCHING A TUNNEL DIODE TO ACHIEVE A PREDETERMINED PEAK CURRENT CHARACTERISTIC WHICH COMPRISES A CONTAINER HAVING AN ETCHANT SOLUTION THEREIN, MEANS FOR IMMERSING SAID DIODE IN SAID CONTAINER, MEANS FOR APPLYING A PULSATING CHECKING CURRENT THROUGH THE IMMERSED DIODE IN THE FORWARD DIRECTION, VOLTAGE SENSING MEANS CONNECTED ACROSS SAID DIODE, AND MEANS RESPONSIVE TO A VOLTAGE JUMP SENSED BY SAID SENSING MEANS TO TERMINATE ETCHING UPON SENSING OF SAID JUMP.
Claim 6
Independent Claim
73 words
AN APPARATUS FOR ETCHING A TUNNEL DIODE TO ACHIEVE A PREDETERMINED PEAK CURRENT CHARACTERISTIC WHICH COMPRISES A CONTAINER HAVING AN ETCHANT SOLUTION THEREIN, MEANS FOR IMMERSING SAID DIODE IN SAID CONTAINER, MEANS FOR APPLYING A PULSATING CHECKING CURRENT THROUGH THE IMMERSED DIODE IN THE FORWARD DIRECTION, VOLTAGE SENSING MEANS CONNECTED ACROSS SAID DIODE, AND MEANS RESPONSIVE TO A VOLTAGE JUMP SENSED BY SAID SENSING MEANS TO TERMINATE ETCHING UPON SENSING OF SAID JUMP.
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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) | 1969-05-09 | 1969-11-08 | 1970-05-10 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1973-05-09 | 1973-11-08 | 1974-05-10 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1977-05-09 | 1977-11-08 | 1978-05-10 | $7700.00 | Window Closed / Lapsed |