US2654681A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Magnetic recording tape
Assignee: 3M Co
•
Filing: 1950-01-27
•
Granted: 1953-10-06
•
Expires: 1970-01-27
Abstract
No abstract record available.
Inventors
- 👤 Laurence B Lueck
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 07:51
CPC Classifications
G; G11; G11B; G11B5/00; G11B5/62; G11B5/68; G11B5/70; G11B5/71; Y; Y10; Y10S; Y10S428/00; Y10S428/90; Y10T; Y10T428/00; Y10T428/31504; Y10T428/31652; Y10T428/31663
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
95 words
MAGNETIC RECORDING TAPE COMPRISING A THIN FLEXIBLE NON-MAGNETIC SUPPORT AND FIRMLY BONDED THERETO A MAGNETICALLY SUSCEPTTIBLE COATING AND HAVING A FRICTIONAL PULL AS HEREIN DEFINED OF NOT MORE THAN ABOUT 30 GRAMS, SAID COATING CONSISTING MAINLY OF A MAGNETIC POWDER DISPERSED IN A THERMOPLASTIC RESINOUS POLYMERIC BINDER AND CONTAINING AS A PERMANENT FRICTION-REDUCING COMPONENT A HIGH MOLECULAR WEIGHT LIQUID POLYMERIC DIMETHYLSILICONE, SAID POLYMERIC BINDER IN THE ABSENCE OF SAID DIMETHYLSILICONE PROVIDING A TAPE PRODUCT HAVING A FRICTIONAL PULL SUBSTANTIALLY GREATER THAN 30 GRAMS AND GIVING RISE TO SQUEAL AND MODULATION NOISE IN MAGNETICALLY REPRODUCED SIGNALS.
Claim 2
Dependent Claim
95 words
MAGNETIC RECORDING TAPE COMPRISING A THIN FLEXIBLE NON-MAGNETIC SUPPORT AND FIRMLY BONDED THERETO A MAGNETICALLY SUSCEPTTIBLE COATING AND HAVING A FRICTIONAL PULL AS HEREIN DEFINED OF NOT MORE THAN ABOUT 30 GRAMS, SAID COATING CONSISTING MAINLY OF A MAGNETIC POWDER DISPERSED IN A THERMOPLASTIC RESINOUS POLYMERIC BINDER AND CONTAINING AS A PERMANENT FRICTION-REDUCING COMPONENT A HIGH MOLECULAR WEIGHT LIQUID POLYMERIC DIMETHYLSILICONE, SAID POLYMERIC BINDER IN THE ABSENCE OF SAID DIMETHYLSILICONE PROVIDING A TAPE PRODUCT HAVING A FRICTIONAL PULL SUBSTANTIALLY GREATER THAN 30 GRAMS AND GIVING RISE TO SQUEAL AND MODULATION NOISE IN MAGNETICALLY REPRODUCED SIGNALS.
References Cited (Backward Citations)
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Cited
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Cited
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Cited
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Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1956-10-05 | 1957-04-06 | 1957-10-06 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1960-10-05 | 1961-04-06 | 1961-10-06 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1964-10-05 | 1965-04-06 | 1965-10-06 | $7700.00 | Window Closed / Lapsed |