Patent US2302051A successfully refreshed from Google Patents.
US3497625A
Expired / Lapsed
US
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Digital modulation and demodulation in a communication system
Assignee: GTE Sylvania Inc
•
Filing: 1965-07-15
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Granted: 1970-02-24
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Expires: 1985-07-15
Abstract
No abstract record available.
Inventors
- 👤 Ronald E Hileman
- 👤 Vincent C Oxley
- 👤 Joseph W Schmitt
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 12:28
CPC Classifications
H; H04; H04L; H04L27/00; H04L27/0008
Claims Analysis
Total Claims: 0
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USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1973-02-23 | 1973-08-25 | 1974-02-24 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1977-02-23 | 1977-08-25 | 1978-02-24 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1981-02-23 | 1981-08-25 | 1982-02-24 | $7700.00 | Window Closed / Lapsed |