Patent US3033932A successfully refreshed from Google Patents.
US3033932A
Expired / Lapsed
US
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Selective ringing multi-party telephone system
Assignee: Automatic Electric Laboratories Inc
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Filing: 1957-02-08
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Granted: 1962-05-08
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Expires: 1977-02-08
Abstract
No abstract record available.
Inventors
- 👤 Clarence E Lomax
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-30 22:04
CPC Classifications
H; H04; H04Q; H04Q5/00; H04Q5/02
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
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US2245799A
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US2355139A
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US2541362A
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US2532125A
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US2659769A
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US2788394A
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US2782260A
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US2863952A
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US2802902A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1965-05-07 | 1965-11-06 | 1966-05-08 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1969-05-07 | 1969-11-06 | 1970-05-08 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1973-05-07 | 1973-11-06 | 1974-05-08 | $7700.00 | Window Closed / Lapsed |