Patent US3346697A successfully refreshed from Google Patents.
US3346697A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Time division hybrid with bilateral gain
Assignee: AT&T Inc
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Filing: 1965-12-28
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Granted: 1967-10-10
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Expires: 1985-12-28
Abstract
No abstract record available.
Inventors
- 👤 Sotirios C Kitsopoulos
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-25 16:46
CPC Classifications
H; H04; H04Q; H04Q11/00; H04Q11/04; H04B; H04B1/00; H04B1/38; H04B1/40; H04B1/54; H04B1/58; H04B1/588; H04J; H04J3/00; H04J3/20
Claims Analysis
Total Claims: 1
Claim 1
Independent Claim
62 words
A TIME DIVISION COMMUNICATION SYSTEM IN ACCORDANCE WITH CLAIM 3, IN WHICH SAID FIRST IMPEDANCE FORMS A SHUNT-SHUNT NEGATIVE FEEDBACK FOR SAID AMPLIFIER WHEN SAID TIME DIVISION SWITCH CONNECTS SAID OUTPUT TERMINAL TO SAID BILATERAL CHANNEL AND SAID SECOND IMPEDANCE FORMS A SHUNT-SHUNT NEGATIVE FEEDBACK PATH FOR SAID AMPLIFIER WHEN SAID TIME DIVISION SWITCH CONNECTS SAID OUTPUT TERMINAL TO SAID TRANSMITTING CHANNEL.
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) | 1970-10-09 | 1971-04-10 | 1971-10-10 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1974-10-09 | 1975-04-10 | 1975-10-10 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1978-10-09 | 1979-04-10 | 1979-10-10 | $7700.00 | Window Closed / Lapsed |