US3522537A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Vestigial sideband transmission system having two channels in quadrature
Assignee: Western Union Telegraph Co
•
Filing: 1966-07-25
•
Granted: 1970-08-04
•
Expires: 1986-07-25
Abstract
No abstract record available.
Inventors
- 👤 John E Boughtwood
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-25 00:58
CPC Classifications
H; H04; H04L; H04L27/00; H04L27/02
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US3134855A
Cited
US3311442A
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US3343093A
Cited
US3289082A
Cited
US3378771A
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US3378770A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1973-08-03 | 1974-02-02 | 1974-08-04 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1977-08-03 | 1978-02-02 | 1978-08-04 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1981-08-03 | 1982-02-02 | 1982-08-04 | $7700.00 | Window Closed / Lapsed |