Patent US3459972A successfully refreshed from Google Patents.
US3459972A
Expired / Lapsed
US
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Thyristor switch pulse generating circuit having means to improve shape of output pulse
Assignee: AT&T Inc
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Filing: 1967-04-10
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Granted: 1969-08-05
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Expires: 1987-04-10
Abstract
No abstract record available.
Inventors
- 👤 William B Harris
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-07 09:05
CPC Classifications
H; H03; H03K; H03K5/00; H03K5/01; H03K3/00; H03K3/02; H03K3/35; H03K3/352
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) | 1972-08-04 | 1973-02-03 | 1973-08-05 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1976-08-04 | 1977-02-03 | 1977-08-05 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1980-08-04 | 1981-02-03 | 1981-08-05 | $7700.00 | Window Closed / Lapsed |