US2973586A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Device for instructing the public in the proper use of dial-equipped telephone station apparatus
Assignee: AT&T Inc
•
Filing: 1954-12-21
•
Granted: 1961-03-07
•
Expires: 1974-12-21
Abstract
No abstract record available.
Inventors
- 👤 Gordon I Robertson
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-06 08:48
CPC Classifications
H; H04; H04M; H04M3/00; H04M3/22; H04M3/26; H04M3/28; H04M3/32; H04M3/323
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US1835778A
Cited
US2321799A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1964-03-06 | 1964-09-05 | 1965-03-07 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1968-03-06 | 1968-09-05 | 1969-03-07 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1972-03-06 | 1972-09-05 | 1973-03-07 | $7700.00 | Window Closed / Lapsed |