Patent US3466392A successfully refreshed from Google Patents.
US3466392A
Expired / Lapsed
US
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Vestigial sideband frequency shift keying modem
Assignee: International Business Machines Corp
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Filing: 1966-03-03
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Granted: 1969-09-09
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Expires: 1986-03-03
Abstract
No abstract record available.
Inventors
- 👤 Richard W Calfee
- 👤 Emil Hopner
- 👤 Orman F Meyer
- 👤 Lynn P West
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-04 13:27
CPC Classifications
H; H04; H04L; H04L27/00; H04L27/10; H03; H03C; H03C1/00; H03C1/52; H03C1/54; H03C1/542; H03C1/545; H04B; H04B14/00; H04B14/002; H04B14/006
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) | 1972-09-08 | 1973-03-10 | 1973-09-09 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1976-09-08 | 1977-03-10 | 1977-09-09 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1980-09-08 | 1981-03-10 | 1981-09-09 | $7700.00 | Window Closed / Lapsed |