Patent US3284223A successfully refreshed from Google Patents.
US3284223A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Magnetic recording tape supported on terephthalate polyesters of 1, 4-cyclohexanedimethanol
Assignee: Eastman Kodak Co
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Filing: 1965-05-19
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Granted: 1966-11-08
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Expires: 1985-05-19
Abstract
No abstract record available.
Inventors
- 👤 Marshall T Watson
- 👤 William D Kennedy
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-28 15:29
CPC Classifications
G; G11; G11B; G11B5/00; G11B5/62; G11B5/73; G11B5/739; G11B5/73923; G11B5/73927; Y; Y10; Y10S; Y10S428/00; Y10S428/90; Y10T; Y10T428/00; Y10T428/31504; Y10T428/31786; Y10T428/31797
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
135 words
AN IMPROVED MAGNETIC RECORDING TAPE COMPRISING A THIN LAYER OF A MAGNETICALLY SUSCEPTIBLE MATERIAL DISPERSED IN A NONMAGNETIC BINDING COATED ON A FLEXIBLE SUPPORT CONSISTING ESSENTIALLY OF AN ASYMMETRICALLY ORIENTED HIGHMELTING LINEAR POLYESTER OF SUBSTANTIALLY EQUIMOLAR PROPORTIONS OF A DICARBOXYLIC ACID AND 1,4-CYCLOHEXANEDIMETHANOL, SAID DICARBOXYLIC ACID BEING ESSENTIALLY COMPOSED OF TEREPHTHALIC ACID WHICH SUPPORT IN ITS AMORPHOUS FORM HAS BEEN SOLELY ORIENTED BY A PROCESS CONSISTING OF LONGITUDINAL STRETCHING IN THE RANGE OF FROM ABOUT 2.5 TO ABOUT 5.5 TIMES AND ESTABLISHING THE WIDTHWISE DIMENSION WITHIN THE RANGE OF FROM ABOUT 0.95 TO ABOUT 1.3 TIMES THE WIDTH OF THE LONGITUDINALLY STRETCHED SUPPORT, SAID SUPPORT BEING CHARACTERIZED IN THAT IT HAS (1) A PERCENTAGE OF ELONGATION AT BREAK NO GREATER THAN ABOUT 35% AND (2) A PERCENTAGE OF ELONGATION AT YIELD OF AT LEAST 4.9%
Claim 2
Dependent Claim
135 words
AN IMPROVED MAGNETIC RECORDING TAPE COMPRISING A THIN LAYER OF A MAGNETICALLY SUSCEPTIBLE MATERIAL DISPERSED IN A NONMAGNETIC BINDING COATED ON A FLEXIBLE SUPPORT CONSISTING ESSENTIALLY OF AN ASYMMETRICALLY ORIENTED HIGHMELTING LINEAR POLYESTER OF SUBSTANTIALLY EQUIMOLAR PROPORTIONS OF A DICARBOXYLIC ACID AND 1,4-CYCLOHEXANEDIMETHANOL, SAID DICARBOXYLIC ACID BEING ESSENTIALLY COMPOSED OF TEREPHTHALIC ACID WHICH SUPPORT IN ITS AMORPHOUS FORM HAS BEEN SOLELY ORIENTED BY A PROCESS CONSISTING OF LONGITUDINAL STRETCHING IN THE RANGE OF FROM ABOUT 2.5 TO ABOUT 5.5 TIMES AND ESTABLISHING THE WIDTHWISE DIMENSION WITHIN THE RANGE OF FROM ABOUT 0.95 TO ABOUT 1.3 TIMES THE WIDTH OF THE LONGITUDINALLY STRETCHED SUPPORT, SAID SUPPORT BEING CHARACTERIZED IN THAT IT HAS (1) A PERCENTAGE OF ELONGATION AT BREAK NO GREATER THAN ABOUT 35% AND (2) A PERCENTAGE OF ELONGATION AT YIELD OF AT LEAST 4.9%
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USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1969-11-07 | 1970-05-09 | 1970-11-08 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1973-11-07 | 1974-05-09 | 1974-11-08 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1977-11-07 | 1978-05-09 | 1978-11-08 | $7700.00 | Window Closed / Lapsed |