US2931740A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Magnetic elements and methods for making the same
Assignee: Montedison SpA
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Filing: 1957-07-31
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Granted: 1960-04-05
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Expires: 1977-07-31
Abstract
No abstract record available.
Inventors
- 👤 Riboni Ubaldo
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-25 03:16
CPC Classifications
G; G11; G11B; G11B5/00; G11B5/62; G11B5/68; G11B5/70; G11B5/702; Y; Y10; Y10S; Y10S428/00; Y10S428/90; Y10T; Y10T428/00; Y10T428/26; Y10T428/263; Y10T428/264; Y10T428/269; Y10T428/31504; Y10T428/31678; Y10T428/31692; Y10T428/31855; Y10T428/31938
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
130 words
AS A NEW ARTICLE OF MANUFACTURE , A MAGNETIC ELEMENT CONSISTING ESSENTIALLY OF A THIN, FLEXIBLE, NON-MAGNETIC SUPPORT IN THE FORM OF A STRETCHED, DIMENSIONALLY STABILIZED FLIM OF CRYSTALLINE POLYPROPYLENE CONSISTING PREVAILINGLY OF ISOTACTIC MACROMOLECULES AND HAVING AN INTRINSIC VISCOSITY OF ABOUT 0.3 TO ABOUT 2.0 DETERMINED IN TETRAIN AT 135* C., A FINELY DIVIDED MAGNETIC MATERIAL UNIFORMLY DISTRIBUTED ON THE SUPPORT, AND AN ADHESIVE BINDER WHICH ANCHORS THE MAGNETIC MATERIAL TO THE SUPPORT AND CONSIST ESSENTIALLY OF AN AMORPHOUS POLYPROPYLENE MADE UP SUBSTANTIALLY OF ATACTIC MACROMOLECULES AND HAVING AN INTRINSIC VISCOSITY BETWEEN ABOUT 0.2 AND 0.4 DETERMINED IN TETRALIN AT 135*C., SAID ELEMENT HAVING THE CAPACITY TO RECORD AND REPRODUCE SOUND WITH HIGH FIDELITY, AND BEING RESISTANT TO DISTORTION OR ELASTIC MODIFICATION UNDER WIDELY VARYING TEMPERATURE AND HUMIDITY CONDITIONS.
Claim 2
Dependent Claim
130 words
AS A NEW ARTICLE OF MANUFACTURE , A MAGNETIC ELEMENT CONSISTING ESSENTIALLY OF A THIN, FLEXIBLE, NON-MAGNETIC SUPPORT IN THE FORM OF A STRETCHED, DIMENSIONALLY STABILIZED FLIM OF CRYSTALLINE POLYPROPYLENE CONSISTING PREVAILINGLY OF ISOTACTIC MACROMOLECULES AND HAVING AN INTRINSIC VISCOSITY OF ABOUT 0.3 TO ABOUT 2.0 DETERMINED IN TETRAIN AT 135* C., A FINELY DIVIDED MAGNETIC MATERIAL UNIFORMLY DISTRIBUTED ON THE SUPPORT, AND AN ADHESIVE BINDER WHICH ANCHORS THE MAGNETIC MATERIAL TO THE SUPPORT AND CONSIST ESSENTIALLY OF AN AMORPHOUS POLYPROPYLENE MADE UP SUBSTANTIALLY OF ATACTIC MACROMOLECULES AND HAVING AN INTRINSIC VISCOSITY BETWEEN ABOUT 0.2 AND 0.4 DETERMINED IN TETRALIN AT 135*C., SAID ELEMENT HAVING THE CAPACITY TO RECORD AND REPRODUCE SOUND WITH HIGH FIDELITY, AND BEING RESISTANT TO DISTORTION OR ELASTIC MODIFICATION UNDER WIDELY VARYING TEMPERATURE AND HUMIDITY CONDITIONS.
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) | 1963-04-05 | 1963-10-05 | 1964-04-05 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1967-04-05 | 1967-10-05 | 1968-04-05 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1971-04-05 | 1971-10-05 | 1972-04-05 | $7700.00 | Window Closed / Lapsed |