Patent US3530385A successfully refreshed from Google Patents.
US3530385A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Stabilization circuit for the mean level of a three level waveform
Assignee: GRAPHIC TRANSMISSION SYSTEMS Inc
•
Filing: 1969-04-29
•
Granted: 1970-09-22
•
Expires: 1989-04-29
Abstract
No abstract record available.
Inventors
- 👤 John W Smith
- 👤 Albert H Libbey
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 17:13
CPC Classifications
H; H04; H04N; H04N1/00; H04N1/41; H04N1/411; H04N1/413; H04N1/4135; H03; H03K; H03K5/00; H03K5/01; H03K5/08; H03K5/082
Claims Analysis
Total Claims: 0
No claims parsed yet. Click Sync Now above to re-index claims from Google Patents.
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) | 1973-09-21 | 1974-03-23 | 1974-09-22 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1977-09-21 | 1978-03-23 | 1978-09-22 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1981-09-21 | 1982-03-23 | 1982-09-22 | $7700.00 | Window Closed / Lapsed |