Patent US2628999A successfully refreshed from Google Patents.
US3519744A
Expired / Lapsed
US
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Apparatus for connecting visual telephone sets in a conference arrangement
Assignee: AT&T Inc
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Filing: 1967-06-16
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Granted: 1970-07-07
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Expires: 1987-06-16
Abstract
No abstract record available.
Inventors
- 👤 Irwin Dorros
- 👤 Dudley B Robinson Jr
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 08:47
CPC Classifications
H; H04; H04M; H04M3/00; H04M3/42; H04M3/56; H04N; H04N5/00; H04N5/222; H04N5/262; H04N5/268; H04N7/00; H04N7/14; H04N7/15
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US3026374A
Cited
US3352966A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1973-07-06 | 1974-01-05 | 1974-07-07 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1977-07-06 | 1978-01-05 | 1978-07-07 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1981-07-06 | 1982-01-05 | 1982-07-07 | $7700.00 | Window Closed / Lapsed |