Patent US4067019A successfully refreshed from Google Patents.
Patent US2997638A successfully refreshed from Google Patents.
US2997638A
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US
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Signal converter apparatus
Assignee: Westinghouse Electric Corp
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Filing: 1957-04-16
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Granted: 1961-08-22
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Expires: 1977-04-16
Abstract
No abstract record available.
Inventors
- 👤 Willard M Brittain
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-24 22:53
CPC Classifications
B; B21; B21B; B21B37/00; B21B37/58; B21B37/60; H; H03; H03M; H03M1/00; H03M1/12; H03M1/22; H03M1/24; H03M1/26
Claims Analysis
Total Claims: 0
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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) | 1964-08-21 | 1965-02-20 | 1965-08-22 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1968-08-21 | 1969-02-20 | 1969-08-22 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1972-08-21 | 1973-02-20 | 1973-08-22 | $7700.00 | Window Closed / Lapsed |