US3049442A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Process for manufacturing cured magnetic tapes utilizing an isocyanate accelerator
Assignee: International Business Machines Corp
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Filing: 1959-09-03
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Granted: 1962-08-14
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Expires: 1979-09-03
Abstract
No abstract record available.
Inventors
- 👤 Robert S Haines
- 👤 Leland Bernard
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-24 18:04
CPC Classifications
G; G11; G11B; G11B5/00; G11B5/62; G11B5/68; G11B5/70; G11B5/702; G11B5/7021
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
156 words
A CONTAINUOUS PROCESS FOR MANUFACTURING CURED MAGNETIC TAPES HAVING THE CHARACTERISTIC OF EXTENDED WEARABILITY, COMPRISING: (A) PREPARING A COATED TAPE BY AFFIXING TO A CONTINUOUSLY-MOVING BACKING WEB A DISPERSION IN A SOLVENT SELECTED FROM THE GROUP CONSISTING OF TOLUENE, METHYLENE CHLORIDE, ORTHO-DICHLOROBENZENE AND ETHYLENE CHLORIDE OF 3000 PARTS MAGNETIC OXIDE PARTICLES IN 1000 PARTS OF A BINDER CONSISTING OF: (AL) 640 PARTS 3/1 BUTADIENE/ACRYLONITRILE COPOLYMER (A2) 340 PARTS PHENOLIC RESIN (A3) 17 PARTS SOYA LECITHIN (A4) 3 PARTS METHYL (POLY) SILOXANE FLUID (A5) 100 PARTS METHYLENE-BIS-DIPEHNYL-DIISOCYANATE, A CURING ACCELERATOR, AND (A6) 100 PARTS VOLATILE PROTON-DONOR INHIBITOR FOR THE CURING ACCELERATOR SELECTED FROM THE GROUP CONSISTING OF ACETYL CHLORIDE AND ORTHO-CHLOROBENZOYL CHLORIDE; (B) HEAT-DRYING THE CONTINUOUSLY-MOVING FRESHLY-PREPARED TAPE BY PASSING IT THROUGH A HIGH-AIR FLOW OVEN AT TEMPERATURES BELOW 225*F., WHEREBY THE INHIBITOR IS DRIVEN OFF WITH THE SOLVENT; AND (C) HEAT-TREATING THE DRIED TAPE FOR FIVE MINUTES AT 240* F. TO EFFECT AN ACCELERTED COPOLYMERIZATION CURE.
Claim 2
Dependent Claim
156 words
A CONTAINUOUS PROCESS FOR MANUFACTURING CURED MAGNETIC TAPES HAVING THE CHARACTERISTIC OF EXTENDED WEARABILITY, COMPRISING: (A) PREPARING A COATED TAPE BY AFFIXING TO A CONTINUOUSLY-MOVING BACKING WEB A DISPERSION IN A SOLVENT SELECTED FROM THE GROUP CONSISTING OF TOLUENE, METHYLENE CHLORIDE, ORTHO-DICHLOROBENZENE AND ETHYLENE CHLORIDE OF 3000 PARTS MAGNETIC OXIDE PARTICLES IN 1000 PARTS OF A BINDER CONSISTING OF: (AL) 640 PARTS 3/1 BUTADIENE/ACRYLONITRILE COPOLYMER (A2) 340 PARTS PHENOLIC RESIN (A3) 17 PARTS SOYA LECITHIN (A4) 3 PARTS METHYL (POLY) SILOXANE FLUID (A5) 100 PARTS METHYLENE-BIS-DIPEHNYL-DIISOCYANATE, A CURING ACCELERATOR, AND (A6) 100 PARTS VOLATILE PROTON-DONOR INHIBITOR FOR THE CURING ACCELERATOR SELECTED FROM THE GROUP CONSISTING OF ACETYL CHLORIDE AND ORTHO-CHLOROBENZOYL CHLORIDE; (B) HEAT-DRYING THE CONTINUOUSLY-MOVING FRESHLY-PREPARED TAPE BY PASSING IT THROUGH A HIGH-AIR FLOW OVEN AT TEMPERATURES BELOW 225*F., WHEREBY THE INHIBITOR IS DRIVEN OFF WITH THE SOLVENT; AND (C) HEAT-TREATING THE DRIED TAPE FOR FIVE MINUTES AT 240* F. TO EFFECT AN ACCELERTED COPOLYMERIZATION CURE.
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) | 1965-08-13 | 1966-02-12 | 1966-08-14 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1969-08-13 | 1970-02-12 | 1970-08-14 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1973-08-13 | 1974-02-12 | 1974-08-14 | $7700.00 | Window Closed / Lapsed |