US3499995A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Frequency and time division multiplex signalling systems using successive changes of frequency band and time slot
Assignee: British Telecommunications Research Ltd
•
Filing: 1966-06-22
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Granted: 1970-03-10
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Expires: 1986-06-22
Abstract
No abstract record available.
Inventors
- 👤 Adrian P Clark
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-24 00:43
CPC Classifications
H; H04; H04J; H04J13/00; H04J3/00; H04J3/24; H04J4/00; H04L; H04L7/00; H04L7/04; H04L7/041; H04L7/046
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US1917995A
Cited
US2600405A
Cited
US2694140A
Cited
US3037190A
Cited
US3160711A
Cited
US3197563A
Cited
US3310741A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1973-03-09 | 1973-09-08 | 1974-03-10 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1977-03-09 | 1977-09-08 | 1978-03-10 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1981-03-09 | 1981-09-08 | 1982-03-10 | $7700.00 | Window Closed / Lapsed |