Patent US2795241A successfully refreshed from Google Patents.
US2795241A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Rolled laminated tubular members and method of making the same
Assignee: Westinghouse Electric Corp
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Filing: 1954-06-15
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Granted: 1957-06-11
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Expires: 1974-06-15
Abstract
No abstract record available.
Inventors
- 👤 Lewis E Caldwell
- 👤 Riccitiello Michael
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-03 05:51
CPC Classifications
B; B32; B32B; B32B27/00
Claims Analysis
Total Claims: 4
Claim 1
Independent Claim
162 words
IN THE METHOD OF MAKING A ROLLED LAMINATED TUBULAR MEMBER, THE STEPS COMPRISING IMPREGNATING A SHEET FIBROUS MATERIAL WITH AN A-STAGE PHENOLIC RESIN VARNISH, THE VARNISH COMPRISING 35% TO 65% BY WEIGHT OF A PHENOLFORMALDEHYDE RESIN WHICH IS CATALYZED BY A STRONG ALKALI AND FROM 65% TO 35% BY WEIGHT OF A PHENOL-FORMALDEHYDE REIN CATALYZED WITH A WEAK ALKALI, SCRAPING THE VARNISH FROM ONE SIDE OF THE VARNISH IMPREGNATED SHEET, HEATING THE SHEET IN AN OVEN TO EVAPORATE THE VARNISH FROM THE SHEET AND ADVANCE THE RESIN TO THE B-STAGE, PASSING THE BSTAGE RESIN IMPREGENATED SHEET OVERA HEATED ROIL TO FUSE THE RESIN, WRAPPING A PLURALITY OF TURNS OF THE HEATED RESIN IMPREGNATED SHEET ON A MANDREL WITH THE SCRAPED SIDE BEING OUTWARDLY FROM THE MANDREL, HEATING ATHE MANDREL WITH THE WRAPPED SHEET THEREON TO ADVANCE THE RESIN TO ITS FINAL INFUSIBLE INSOLUBLE C-STAGE ATO BOND THE SHEET TOGETHER AND FORM A LAMINATED TUBULAR MEMBER, AND WITHDRAWING THE MANDREL FROM THE TUBE.
Claim 2
Dependent Claim
162 words
IN THE METHOD OF MAKING A ROLLED LAMINATED TUBULAR MEMBER, THE STEPS COMPRISING IMPREGNATING A SHEET FIBROUS MATERIAL WITH AN A-STAGE PHENOLIC RESIN VARNISH, THE VARNISH COMPRISING 35% TO 65% BY WEIGHT OF A PHENOLFORMALDEHYDE RESIN WHICH IS CATALYZED BY A STRONG ALKALI AND FROM 65% TO 35% BY WEIGHT OF A PHENOL-FORMALDEHYDE REIN CATALYZED WITH A WEAK ALKALI, SCRAPING THE VARNISH FROM ONE SIDE OF THE VARNISH IMPREGNATED SHEET, HEATING THE SHEET IN AN OVEN TO EVAPORATE THE VARNISH FROM THE SHEET AND ADVANCE THE RESIN TO THE B-STAGE, PASSING THE BSTAGE RESIN IMPREGENATED SHEET OVERA HEATED ROIL TO FUSE THE RESIN, WRAPPING A PLURALITY OF TURNS OF THE HEATED RESIN IMPREGNATED SHEET ON A MANDREL WITH THE SCRAPED SIDE BEING OUTWARDLY FROM THE MANDREL, HEATING ATHE MANDREL WITH THE WRAPPED SHEET THEREON TO ADVANCE THE RESIN TO ITS FINAL INFUSIBLE INSOLUBLE C-STAGE ATO BOND THE SHEET TOGETHER AND FORM A LAMINATED TUBULAR MEMBER, AND WITHDRAWING THE MANDREL FROM THE TUBE.
Claim 3
Dependent Claim
119 words
A ROLLED LAMINATED TUBULAR STRUCTURE COMPRISING SHEET FIBROUS MATERIAL IMPREGNATED TO A RESIN RATIO OF FROM 2.0 TO 2.5 WITH A PHENOL-FORMALDEHYDE RESIN, THE RESIN COMPRISING FROM 35% TO 65% BY WEIGHT OF A PHENOLFORMALDEHYDE RESIN CATALYZED WITH AT LEAST ONE STRONG ALKALI SELECTED FROM THE GROUP CONSISTING OF SODIUM HYDROXIDE AND POTASSIUM HYDROXIDE IN AN AMOUNT OF FROM 0.25% TO 5% BY WEIGHT, BASED ON THE WEIGHT OF THE PHENOL, AND FROM 65% TO 35% BY WEIGHT OF A PHENOLFORMALDEHYDE RESIN CATALYST WITH AT LEAST ONE WEAKER ALKALI SELECTED FROM THE GROUP CONSISTING OF CALCUIM, BARIUM, AND STRONTIUM OXIDES AND HYDROXIDES IN AN AMOUNT OF FROM 0.25% TO 5% BY WEIGHT, BASED ON THE WEIGHT OF THE PHENOL.
Claim 4
Dependent Claim
119 words
A ROLLED LAMINATED TUBULAR STRUCTURE COMPRISING SHEET FIBROUS MATERIAL IMPREGNATED TO A RESIN RATIO OF FROM 2.0 TO 2.5 WITH A PHENOL-FORMALDEHYDE RESIN, THE RESIN COMPRISING FROM 35% TO 65% BY WEIGHT OF A PHENOLFORMALDEHYDE RESIN CATALYZED WITH AT LEAST ONE STRONG ALKALI SELECTED FROM THE GROUP CONSISTING OF SODIUM HYDROXIDE AND POTASSIUM HYDROXIDE IN AN AMOUNT OF FROM 0.25% TO 5% BY WEIGHT, BASED ON THE WEIGHT OF THE PHENOL, AND FROM 65% TO 35% BY WEIGHT OF A PHENOLFORMALDEHYDE RESIN CATALYST WITH AT LEAST ONE WEAKER ALKALI SELECTED FROM THE GROUP CONSISTING OF CALCUIM, BARIUM, AND STRONTIUM OXIDES AND HYDROXIDES IN AN AMOUNT OF FROM 0.25% TO 5% BY WEIGHT, BASED ON THE WEIGHT OF THE PHENOL.
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) | 1960-06-10 | 1960-12-10 | 1961-06-11 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1964-06-10 | 1964-12-10 | 1965-06-11 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1968-06-10 | 1968-12-10 | 1969-06-11 | $7700.00 | Window Closed / Lapsed |