US3492440A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Direct station selection telephone set employing proximity type selector switches
Assignee: AT&T Inc
•
Filing: 1967-05-25
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Granted: 1970-01-27
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Expires: 1987-05-25
Abstract
No abstract record available.
Inventors
- 👤 Ralph L Cerbone
- 👤 Michael A Flavin
- 👤 Norris R Hall
- 👤 John W Rieke
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 01:36
CPC Classifications
H; H04; H04Q; H04Q3/00; H04M; H04M1/00; H04M1/02; H04M1/23; H04M1/26; H04M1/27; H04M1/274; H04M1/2745; H04M1/27495; H03; H03K; H03K2217/00; H03K2217/94; H03K2217/96; H03K2217/9607; H03K2217/960755; H03K2217/96077
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US3428758A
Cited
US3419697A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1973-01-26 | 1973-07-28 | 1974-01-27 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1977-01-26 | 1977-07-28 | 1978-01-27 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1981-01-26 | 1981-07-28 | 1982-01-27 | $7700.00 | Window Closed / Lapsed |