US3150232A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Variable damping circuits
Assignee: Individual
•
Filing: 1961-02-06
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Granted: 1964-09-22
•
Expires: 1981-02-06
Abstract
No abstract record available.
Inventors
- 👤 Edward R Schmidt
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-24 05:41
CPC Classifications
H; H04; H04Q; H04Q1/00; H04Q1/18; H04Q1/30; H04Q1/44; H04Q1/444; H04Q1/46
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
76 words
A SWITCHING CENTER FOR A COMMUNICATION SYSTEM COMPRISING BAND-PASS FILTER MEANS FOR PASSING A SINGLE FREQUENCY TONE, MEANS CONNECTED TO SAID FILTER FOR VARIABLY DAMPING OSCILLATIONS WHICH MAY OCCUR IN SAID FILTER, A VOICE GUARD CONTROL CIRCUIT HAVING A TONE FREQUENCY SIGNAL OUTPUT AND A CONTROL SIGNAL OUTPUT, FIRST CONNECTING MEANS CONNECTING SAID TONE FREQUENCY SIGNAL OUTPUT TO SAID FILTER MEANS, AND SECOND CONNECTING MEANS FOR CONNECTING SAID CONTROL SIGNAL OUTPUT TO SAID VARIABLE DAMPING MEANS.
Claim 2
Dependent Claim
76 words
A SWITCHING CENTER FOR A COMMUNICATION SYSTEM COMPRISING BAND-PASS FILTER MEANS FOR PASSING A SINGLE FREQUENCY TONE, MEANS CONNECTED TO SAID FILTER FOR VARIABLY DAMPING OSCILLATIONS WHICH MAY OCCUR IN SAID FILTER, A VOICE GUARD CONTROL CIRCUIT HAVING A TONE FREQUENCY SIGNAL OUTPUT AND A CONTROL SIGNAL OUTPUT, FIRST CONNECTING MEANS CONNECTING SAID TONE FREQUENCY SIGNAL OUTPUT TO SAID FILTER MEANS, AND SECOND CONNECTING MEANS FOR CONNECTING SAID CONTROL SIGNAL OUTPUT TO SAID VARIABLE DAMPING MEANS.
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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) | 1967-09-22 | 1968-03-23 | 1968-09-22 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1971-09-22 | 1972-03-23 | 1972-09-22 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1975-09-22 | 1976-03-23 | 1976-09-22 | $7700.00 | Window Closed / Lapsed |