US2809237A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Magnetic sound recording head
Assignee: BASF SE
•
Filing: 1951-02-03
•
Granted: 1957-10-08
•
Expires: 1971-02-03
Abstract
No abstract record available.
Inventors
- 👤 Bergmann Friedrich
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-27 18:28
CPC Classifications
G; G11; G11B; G11B5/00; G11B5/127; G11B5/133
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
12 words
MAGNETIC SOUND RECORDING HEAD HAVING A CORE CONSISTING EXCLUSIVELY OF MAGNETIC FERRITE.
Claim 2
Dependent Claim
12 words
MAGNETIC SOUND RECORDING HEAD HAVING A CORE CONSISTING EXCLUSIVELY OF MAGNETIC FERRITE.
References Cited (Backward Citations)
US2452529A
Cited
US2452530A
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US2452531A
Cited
US2493742A
Cited
CH274288A
Cited
US2536260A
Cited
US2592652A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1960-10-07 | 1961-04-08 | 1961-10-08 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1964-10-07 | 1965-04-08 | 1965-10-08 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1968-10-07 | 1969-04-08 | 1969-10-08 | $7700.00 | Window Closed / Lapsed |