Patent US2321812A successfully refreshed from Google Patents.
US2321812A
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Tape driving system for magnetic sound recording machines and the like
Assignee: Heller
•
Filing: 1940-11-19
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Granted: 1943-06-15
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Expires: 1960-11-19
Abstract
No abstract record available.
Inventors
- 👤 Herman S Heller
- 👤 Donald E Ross
- 👤 Forrest J Lilly
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-22 19:34
CPC Classifications
G; G11; G11B; G11B15/00; G11B15/60; G11B15/66; G11B15/662; G11B15/18; G11B15/26; G11B15/32; G11B15/44; G11B15/444; G11B15/446; G11B15/448; G11B15/46; G11B15/50; G11B15/54; G11B5/00; G11B5/48; G11B5/49; G11B5/4969
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
No citation records indexed.
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1946-06-14 | 1946-12-14 | 1947-06-15 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1950-06-14 | 1950-12-14 | 1951-06-15 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1954-06-14 | 1954-12-14 | 1955-06-15 | $7700.00 | Window Closed / Lapsed |