Patent US2633431A successfully refreshed from Google Patents.
US2633431A
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Magnetic recording tape and method of making same
Assignee: Shellmar Products Corp
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Filing: 1947-12-20
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Granted: 1953-03-31
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Expires: 1967-12-20
Abstract
No abstract record available.
Inventors
- 👤 Sylva Oscar Joseph De
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-24 16:07
CPC Classifications
G; G11; G11B; G11B5/00; G11B5/84; G11B5/842; Y; Y10; Y10T; Y10T428/00; Y10T428/26; Y10T428/269; Y10T428/29; Y10T428/2982; Y10T428/2991; Y10T428/2998
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
112 words
A METHOD OF APPLYING AN OVERALL COATING COMPOSITION OF VISCOUS MATERIAL CONTAINING A DISPERSION OF MAGNETIC SENSITIVE PARTICLES ONTO A CONTINUOUSLY RUNNING NON-METALLIC WEB TO PROVIDE MAGNETIC RECORDING AND REPRODUCING TAPE, WHICH COMPRISES THE STEPS OF APPLYING AN OVERALL PRIMING COAT OF SAID MATERIAL, HAVING A WET THICKNESS FALLING WITHIN A RANGE OF ABOUT 0.0015 TO 0.0020 OF AN INCH, TO SAID WEB, LEVELING AND SMOOTHING THE SURFACE OF SAID PRIMING COAT, DRYING THE LEVELED PRIMING COAT AND REPEATING SAID STEPS UNTIL A COMPOSITE COATING OF UNIFORM THICKNESS, CONSISTING OF AT LEAST THREE LAYERS, HAS BEEN BUILT UPON SAID WEB PROPERLY TO CONCENTRATE AND TO PROVIDE SUBSTANTIALLY EQUALIZED DISPERSION OF SAID PAR-
Claim 2
Independent Claim
112 words
A METHOD OF APPLYING AN OVERALL COATING COMPOSITION OF VISCOUS MATERIAL CONTAINING A DISPERSION OF MAGNETIC SENSITIVE PARTICLES ONTO A CONTINUOUSLY RUNNING NON-METALLIC WEB TO PROVIDE MAGNETIC RECORDING AND REPRODUCING TAPE, WHICH COMPRISES THE STEPS OF APPLYING AN OVERALL PRIMING COAT OF SAID MATERIAL, HAVING A WET THICKNESS FALLING WITHIN A RANGE OF ABOUT 0.0015 TO 0.0020 OF AN INCH, TO SAID WEB, LEVELING AND SMOOTHING THE SURFACE OF SAID PRIMING COAT, DRYING THE LEVELED PRIMING COAT AND REPEATING SAID STEPS UNTIL A COMPOSITE COATING OF UNIFORM THICKNESS, CONSISTING OF AT LEAST THREE LAYERS, HAS BEEN BUILT UPON SAID WEB PROPERLY TO CONCENTRATE AND TO PROVIDE SUBSTANTIALLY EQUALIZED DISPERSION OF SAID PAR-
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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) | 1956-03-30 | 1956-09-29 | 1957-03-31 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1960-03-30 | 1960-09-29 | 1961-03-31 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1964-03-30 | 1964-09-29 | 1965-03-31 | $7700.00 | Window Closed / Lapsed |