US2542535A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Device for automatically diverting telephone calls
Assignee: Individual
•
Filing: 1949-04-16
•
Granted: 1951-02-20
•
Expires: 1969-04-16
Abstract
No abstract record available.
Inventors
- 👤 Kaelin Pierre
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 02:09
CPC Classifications
H; H04; H04M; H04M1/00; H04M1/64; H04M1/65; H04M1/006
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
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 |