Patent US2749489A successfully refreshed from Google Patents.
US2749489A
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Dry contact rectifiers
Assignee: International Standard Electric Corp
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Filing: 1950-12-04
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Granted: 1956-06-05
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Expires: 1970-12-04
Abstract
No abstract record available.
Inventors
- 👤 Mayer Simon Ernst
- 👤 Hill Ronald Alfred
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-26 16:47
CPC Classifications
H; H10; H10P; H10P95/00; H10P95/80; H10D; H10D62/00; H10D62/80; H10D62/874; H10D62/875; H10P10/00
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
46 words
A DRY CONTACT RECTIFIER CONSISTING SOLELY OF TWO LAYERS: A BASE PLATE CONSISTING OF A CONSOLIDATED POWDER OF ONE OR MORE SEMI-CONDUCTING METALLIC OXIDES, AND A LAYER OF ONE OR MORE CONDUCTING METALLIC OXIDES IN INTIMATE MECHANICAL AND ELECTRICAL CONTACT WITH ONE SURFACE OF SAID PLATE.
Claim 2
Dependent Claim
46 words
A DRY CONTACT RECTIFIER CONSISTING SOLELY OF TWO LAYERS: A BASE PLATE CONSISTING OF A CONSOLIDATED POWDER OF ONE OR MORE SEMI-CONDUCTING METALLIC OXIDES, AND A LAYER OF ONE OR MORE CONDUCTING METALLIC OXIDES IN INTIMATE MECHANICAL AND ELECTRICAL CONTACT WITH ONE SURFACE OF SAID PLATE.
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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) | 1959-06-05 | 1959-12-05 | 1960-06-05 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1963-06-05 | 1963-12-05 | 1964-06-05 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1967-06-05 | 1967-12-05 | 1968-06-05 | $7700.00 | Window Closed / Lapsed |