US3259693A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Frequency division multiplex communication system
Assignee: NEC Corp
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Filing: 1961-09-26
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Granted: 1966-07-05
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Expires: 1981-09-26
Abstract
No abstract record available.
Inventors
- 👤 Watanabe Hitoshi
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-24 15:23
CPC Classifications
H; H04; H04J; H04J1/00; H04J1/02; H04J1/06; H04B; H04B14/00; H04B14/002; H04B14/004; H04B14/02
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
51 words
A FREQUENCY DIVISION PULSE COMMUNICATION SYSTEM COMPRISING A SOURCE OF WHITE NOISE, A PLURALITY OF DISTINCTIVE FILTERS COUPLED TO SAID SOURCE FOR SELECTING A PLURALITY OF DISTINCT BANDS OF FREQUENCIES, A COMMON TRANSMISSION MEANS COUPLED TO SAID FILTERS, AND MEANS FOR MODULATING EACH FREQUENCY BAND WITH A SEPARATE SOURCE OF SIGNALS.
Claim 2
Dependent Claim
51 words
A FREQUENCY DIVISION PULSE COMMUNICATION SYSTEM COMPRISING A SOURCE OF WHITE NOISE, A PLURALITY OF DISTINCTIVE FILTERS COUPLED TO SAID SOURCE FOR SELECTING A PLURALITY OF DISTINCT BANDS OF FREQUENCIES, A COMMON TRANSMISSION MEANS COUPLED TO SAID FILTERS, AND MEANS FOR MODULATING EACH FREQUENCY BAND WITH A SEPARATE SOURCE OF SIGNALS.
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) | 1969-07-04 | 1970-01-03 | 1970-07-05 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1973-07-04 | 1974-01-03 | 1974-07-05 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1977-07-04 | 1978-01-03 | 1978-07-05 | $7700.00 | Window Closed / Lapsed |