US2850570A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Sound recording and reproducing apparatus in conjunction with a telephone subscriber set
Assignee: INTERNOVA TRUST
•
Filing: 1953-07-28
•
Granted: 1958-09-02
•
Expires: 1973-07-28
Abstract
No abstract record available.
Inventors
- 👤 Muller Willy
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-05 18:26
CPC Classifications
G; G11; G11B; G11B31/00; G11B25/00; G11B25/04; G11B25/043; H; H04; H04M; H04M1/00; H04M1/64; H04M1/65; H04M1/6515
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) | 1961-09-01 | 1962-03-03 | 1962-09-02 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1965-09-01 | 1966-03-03 | 1966-09-02 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1969-09-01 | 1970-03-03 | 1970-09-02 | $7700.00 | Window Closed / Lapsed |