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US2854542A
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US
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Vibratory signaling device
Assignee: AT&T Inc
•
Filing: 1955-05-24
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Granted: 1958-09-30
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Expires: 1975-05-24
Abstract
No abstract record available.
Inventors
- 👤 Jr Albert P Boysen
- 👤 Luther E Krebs
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 15:52
CPC Classifications
H; H04; H04M; H04M1/00; H04M1/02; H04M1/23
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
USRE21038E
Cited
US1061919A
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US1254658A
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US1348842A
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US1643270A
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US2289830A
Cited
US2269242A
Cited
US2618717A
Cited
US2770697A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1961-09-29 | 1962-03-31 | 1962-09-30 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1965-09-29 | 1966-03-31 | 1966-09-30 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1969-09-29 | 1970-03-31 | 1970-09-30 | $7700.00 | Window Closed / Lapsed |