US3219990A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Spherical transducer for magnetic tape recording
Assignee: GAY LEE CO
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Filing: 1962-06-18
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Granted: 1965-11-23
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Expires: 1982-06-18
Abstract
No abstract record available.
Inventors
- 👤 Earl G Goehle
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-06 10:05
CPC Classifications
G; G11; G11B; G11B15/00; G11B15/60; G11B15/62
Claims Analysis
Total Claims: 1
Claim 1
Independent Claim
96 words
A TAPE RECORDER TRANSDUCER COMPRISING A BASE MEMBER FOR THE SUPPORT OF A MAGNETIZABLE ELEMENT, SAID BASE MEMBER HAVING A CONVEX GENERALLY SPHERICAL FACE THEREON FOR SLIDABLY SUPPORTING A MAGNETIC TAPE, AND A PRESSURE PAD HAVING A CONCAVE GENERALLY SPHERICAL FACE COMPLEMENTARY TO THE CONVEX FACE ON SAID BASE MEMBER DISPOSED IN SPACED CONFRONTING RELATION THERETO, SAID PRESSURE PAD HAVING AN AIR CHAMBER AND A PLURALITY OF APERTURES IN THE CONCAVE FACE THEREOF FOR CONDUCTING AIR UNDER PRESSURE FROM THE CHAMBER TOWARD THE TAPE TO BIAS THE TAPE AGAINST THE CONVEX SURFACE OF SAID BASE MEMBER.
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) | 1968-11-22 | 1969-05-24 | 1969-11-23 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1972-11-22 | 1973-05-24 | 1973-11-23 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1976-11-22 | 1977-05-24 | 1977-11-23 | $7700.00 | Window Closed / Lapsed |