US3489853A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Data transmission by pulse width modulation with amplitude adjusted to eliminate dc drift
Assignee: Ferranti Packard Ltd
•
Filing: 1966-06-06
•
Granted: 1970-01-13
•
Expires: 1986-06-06
Abstract
No abstract record available.
Inventors
- 👤 Gordon R Lang
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 09:05
CPC Classifications
H; H04; H04L; H04L25/00; H04L25/38; H04L25/40; H04L25/49
Claims Analysis
Total Claims: 0
No claims parsed yet. Click Sync Now above to re-index claims from Google Patents.
References Cited (Backward Citations)
US3110819A
Cited
US3147449A
Cited
US3144609A
Cited
US3181074A
Cited
US3289170A
Cited
US3191071A
Cited
US3366882A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1973-01-12 | 1973-07-14 | 1974-01-13 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1977-01-12 | 1977-07-14 | 1978-01-13 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1981-01-12 | 1981-07-14 | 1982-01-13 | $7700.00 | Window Closed / Lapsed |