Resin coated filamentary material
Abstract
Abstract THE INVENTION PROVIDES (1) BORON FILAMENT COATED WITH A PHENOLIC-POLYVINYL ACETAL RESIN AS A MEDIUM FOR BONDING THE FILAMENT TO AN EPOXY TYPE MATRIX MATERIAL, (2) PROCESS FOR MANUFACTURE OF THE ABOVE COATED BORON FILAMENTS INVOLVING CONTACT OF BARE BORON FILAMENTS WITH A SOLUTION OF SAID RESINS TO WET THE FILAMENT, REGULATING THICKNESS OF THE RESULTING SOLUTION LAYER TO PROVIDE THE RESIDUAL RESIN COATING SOUGHT, REMOVING SOLVENT FROM THE WETTING LAYER, AND PARTIALLY CURING RESIDUAL SOLID RESIN AS THE RESIN COATING, (3) BROAD GOODS COMPRISING MAT PRODUCT OF FILAMENTARY WINDING OF THE ABOVE DESCRIBED RESIN COATED BORON FILAMENTS, (4) METHOD FOR FORMING A SPECIFIC COATING SOLUTION FOR THE BARE FILAMENTS, INVOLVING FORMING A SEPARATE SOLUTION OF EACH OF THE RESINS IN PREDETERMINED RESIN PROPORTIONS AND CONCENTRATIONS, AND THEN ADMIXING THE TWO SEPARATE SOLUTIONS TO FORM THE PRODUCT SOLUTION AND (5) RESULTING COATING SOLUTION OF 5-20 WEIGHT PERCENT TOTAL RESIN CONTENT, IN A PHENOLIC RESIN TO POLYVINYL ACETAL RESIN WEIGHT RATIO OF FROM ABOUT 0.25:1 TO 18:1.
Inventors
- 👤 Leonard L Gelb
Bibliographic Details
Claims Analysis
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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) | 1974-05-10 | 1974-11-09 | 1975-05-11 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1978-05-10 | 1978-11-09 | 1979-05-11 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1982-05-10 | 1982-11-09 | 1983-05-11 | $7700.00 | Window Closed / Lapsed |