Patent US3200516A successfully refreshed from Google Patents.
US3200516A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Electronic teaching device
Assignee: Fleetwood Furniture Co Inc
•
Filing: 1961-04-21
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Granted: 1965-08-17
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Expires: 1981-04-21
Abstract
No abstract record available.
Inventors
- 👤 Donald O Parker
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-25 17:54
CPC Classifications
G; G09; G09B; G09B5/00; G09B5/08; G09B5/14
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
77 words
AN ELECTRONIC TEACHING DEVICE COMPRISING: A PROGRAM SOURCE, A FIRST POWER SOURCE, AN INTERCOM POSITION, AND A STUDENT POSITION, A PAIR OF WIRES CONNECTING SAID PROGRAM SOURCE AND FIRST POWER SOURCE TO SAID STUDENT POSITION, A DIODE CONNECTED IN SERIES WITH ONE OF SAID WIRES IN A DIRECTION WHRE IT IS FORWARDLY BIASED BY SAID FIRST POWER SOURCE, MEANS FOR CONNECTING A SECOND POWER SOURCE OF HIGHER VOLTAGE THAN SAID FIRST POWER SOURCE ACROSS SAID WIRES SO
Claim 2
Dependent Claim
77 words
AN ELECTRONIC TEACHING DEVICE COMPRISING: A PROGRAM SOURCE, A FIRST POWER SOURCE, AN INTERCOM POSITION, AND A STUDENT POSITION, A PAIR OF WIRES CONNECTING SAID PROGRAM SOURCE AND FIRST POWER SOURCE TO SAID STUDENT POSITION, A DIODE CONNECTED IN SERIES WITH ONE OF SAID WIRES IN A DIRECTION WHRE IT IS FORWARDLY BIASED BY SAID FIRST POWER SOURCE, MEANS FOR CONNECTING A SECOND POWER SOURCE OF HIGHER VOLTAGE THAN SAID FIRST POWER SOURCE ACROSS SAID WIRES SO
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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) | 1968-08-16 | 1969-02-15 | 1969-08-17 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1972-08-16 | 1973-02-15 | 1973-08-17 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1976-08-16 | 1977-02-15 | 1977-08-17 | $7700.00 | Window Closed / Lapsed |