US3312924A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Solid state switching device
Assignee: 3M Co
•
Filing: 1965-09-27
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Granted: 1967-04-04
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Expires: 1985-09-27
Abstract
No abstract record available.
Inventors
- 👤 William R Eubank
- 👤 David L Cross
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-31 23:14
CPC Classifications
H; H03; H03K; H03K17/00; C; C03; C03C; C03C3/00; C03C3/32; C03C3/321; H10; H10N; H10N70/00; H10N70/011; H10N70/021; H10N70/026; H10N70/20; H10N70/801; H10N70/881; H10N70/882; H10N70/8822
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
134 words
A SOLID STATE SWITCHING DEVICE WHICH, WHEN SEMICONDUCTIVE, IS CAPABLE OF ALTERING ITS RESITANCE FROMA HIGH VALUE TO A LOW VALUE AND VICE VERSA RESPONSIVE TO ELECTRIC FIELDS OF PREDETERMINED POLARITY, SAID DEVICE COMPRISING (A) A SUBSTRATE OF ALUMINUM METAL, SAID SUBSTRATE HAVING A SURFCE CHARACTERIZED BY (1) HAVING A ROUGHNESS NOT GREATER THAN ABOUT 25 MICROINCHES (ABOUT 0.625 MICRON) R.M.S.; AND (2) BEING SUBSTANTIALLY FREE OF ALUMINUM OXIDE; (B) A COATING ON AT LEAST A PORTION OF SAID SURFACE, SAID COMPOSITON BEING AN ORDERED VAPOR DEPOSITED LAYER NOT MORE THAN ABOUT 1 MIL (ABOUT 0.025 MM.) IN THICKNESS OF A GLASS COMPOSITION, THE MINIMUM WIDTH OF SAID LAYER BEING AT LEAST TWICE THE THICKNESS THEREOF; (C) SAID GLASS COMPOSITION BEING ONE SELECTED FROM A GROUP OF GLASS SYSTEMS DEFINED BY THE FOLLOWING TABLE:
Claim 2
Dependent Claim
134 words
A SOLID STATE SWITCHING DEVICE WHICH, WHEN SEMICONDUCTIVE, IS CAPABLE OF ALTERING ITS RESITANCE FROMA HIGH VALUE TO A LOW VALUE AND VICE VERSA RESPONSIVE TO ELECTRIC FIELDS OF PREDETERMINED POLARITY, SAID DEVICE COMPRISING (A) A SUBSTRATE OF ALUMINUM METAL, SAID SUBSTRATE HAVING A SURFCE CHARACTERIZED BY (1) HAVING A ROUGHNESS NOT GREATER THAN ABOUT 25 MICROINCHES (ABOUT 0.625 MICRON) R.M.S.; AND (2) BEING SUBSTANTIALLY FREE OF ALUMINUM OXIDE; (B) A COATING ON AT LEAST A PORTION OF SAID SURFACE, SAID COMPOSITON BEING AN ORDERED VAPOR DEPOSITED LAYER NOT MORE THAN ABOUT 1 MIL (ABOUT 0.025 MM.) IN THICKNESS OF A GLASS COMPOSITION, THE MINIMUM WIDTH OF SAID LAYER BEING AT LEAST TWICE THE THICKNESS THEREOF; (C) SAID GLASS COMPOSITION BEING ONE SELECTED FROM A GROUP OF GLASS SYSTEMS DEFINED BY THE FOLLOWING TABLE:
References Cited (Backward Citations)
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US3249469A
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US3117013A
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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) | 1970-04-03 | 1970-10-03 | 1971-04-04 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1974-04-03 | 1974-10-03 | 1975-04-04 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1978-04-03 | 1978-10-03 | 1979-04-04 | $7700.00 | Window Closed / Lapsed |