Patent US2542880A successfully refreshed from Google Patents.
US2542880A
Expired / Lapsed
US
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Condition-responsive apparatus for calling preselected telephone numbers
Assignee: Individual
•
Filing: 1947-03-13
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Granted: 1951-02-20
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Expires: 1967-03-13
Abstract
No abstract record available.
Inventors
- 👤 Ravera Michele
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-25 17:08
CPC Classifications
H; H04; H04M; H04M11/00; H04M11/04; H04M11/045; H04M1/00; H04M1/26; H04M1/27; H04M1/272
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US1306074A
Cited
US825623A
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US1029577A
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US969393A
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US982052A
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US1063096A
Cited
US1089404A
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US1722447A
Cited
US1921615A
Cited
US2159650A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1954-02-19 | 1954-08-21 | 1955-02-20 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1958-02-19 | 1958-08-21 | 1959-02-20 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1962-02-19 | 1962-08-21 | 1963-02-20 | $7700.00 | Window Closed / Lapsed |