Patent US2609458A successfully refreshed from Google Patents.
US2609458A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Telephone apparatus
Assignee: Individual
•
Filing: 1950-05-17
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Granted: 1952-09-02
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Expires: 1970-05-17
Abstract
No abstract record available.
Inventors
- 👤 Vigren Sten Daniel
- 👤 Gustafsson Gustaf Ernfrid
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-29 15:00
CPC Classifications
H; H04; H04R; H04R21/00; H04R21/02; H04R21/021
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US575887A
Cited
US1406833A
Cited
US1388963A
Cited
US1815987A
Cited
US2042822A
Cited
US2513171A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1955-09-02 | 1956-03-03 | 1956-09-02 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1959-09-02 | 1960-03-03 | 1960-09-02 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1963-09-02 | 1964-03-03 | 1964-09-02 | $7700.00 | Window Closed / Lapsed |