US2672509A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Teletypewriter frequency shift transmission
Assignee: Individual
•
Filing: 1949-04-01
•
Granted: 1954-03-16
•
Expires: 1969-04-01
Abstract
No abstract record available.
Inventors
- 👤 Mccoy John Harvey
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-31 22:27
CPC Classifications
H; H04; H04L; H04L27/00; H04L27/10; H04L27/12
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US2103847A
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US2074440A
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US2212548A
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US2225691A
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US2349811A
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US2403358A
Cited
US2492795A
Cited
US2492791A
Cited
US2476141A
Cited
US2531103A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1957-03-15 | 1957-09-14 | 1958-03-16 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1961-03-15 | 1961-09-14 | 1962-03-16 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1965-03-15 | 1965-09-14 | 1966-03-16 | $7700.00 | Window Closed / Lapsed |