US2748830A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Method and apparatus for making spiral wound synthetic piping and tubing
Assignee: American Fixture Inc
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Filing: 1953-01-14
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Granted: 1956-06-05
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Expires: 1973-01-14
Abstract
No abstract record available.
Inventors
- 👤 John J Nash
- 👤 George A Stein
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-22 22:19
CPC Classifications
B; B29; B29C; B29C53/00; B29C53/56; B29C53/58; B29C53/60; B29C53/607; B29C69/00; B29C69/001; B29C69/002; B29C2793/00; B29C2793/009; B29L; B29L2009/00
Claims Analysis
Total Claims: 4
Claim 1
Independent Claim
139 words
THE METHOD OF FORMING PIPE WHICH COMPRISES FORMING A SPIRALLY WOUND CARDBOARD TUBE UPON A MANDREL, FEEDING THE CARDBOARD TUBE PROGRESSIVELY ALONG THE MANDREL IN THE DIRECTION OF THE LONGITUDINAL AXIS OF THE MANDREL, CONTINOUSLY APPLYING A SPIRAL WINDING OF PARTING MATERIAL AROUND THE OUTSIDE OF THE TUBE SO THAT THE WINDING WILL MOVE WITH THE TUBING, APPLYING A SPIRAL WINDING OF TEXTILE-TYPE FIBER GLASS ROVING UPON THE EXTERNAL FACE OF THE PARTING MATERIAL, APPLYING A FILM OF UNPOLYMERIZED POLYESTER RESIN TO SAID LAST NAMED WINDING, APPLYING A SPIRAL WINDING OF FLAT FIBER GLASS TAPE EXTERNALLY UPON THE LAYER FORMED BY THE SPIRALLY WOUND ROVING, APPLYING A FILM OF UNPOLYMERIZED POLYESTER RESIN TO SAID LAST NAMED WINDING, HEAT CURING THE RESIN TO FORM A RESIN BONDED CYLINDRICAL SECTION OF PIPE, AND THEREAFTER REMOVING THE INTERNAL WINDING OF PARTING MATERIAL.
Claim 2
Independent Claim
139 words
THE METHOD OF FORMING PIPE WHICH COMPRISES FORMING A SPIRALLY WOUND CARDBOARD TUBE UPON A MANDREL, FEEDING THE CARDBOARD TUBE PROGRESSIVELY ALONG THE MANDREL IN THE DIRECTION OF THE LONGITUDINAL AXIS OF THE MANDREL, CONTINOUSLY APPLYING A SPIRAL WINDING OF PARTING MATERIAL AROUND THE OUTSIDE OF THE TUBE SO THAT THE WINDING WILL MOVE WITH THE TUBING, APPLYING A SPIRAL WINDING OF TEXTILE-TYPE FIBER GLASS ROVING UPON THE EXTERNAL FACE OF THE PARTING MATERIAL, APPLYING A FILM OF UNPOLYMERIZED POLYESTER RESIN TO SAID LAST NAMED WINDING, APPLYING A SPIRAL WINDING OF FLAT FIBER GLASS TAPE EXTERNALLY UPON THE LAYER FORMED BY THE SPIRALLY WOUND ROVING, APPLYING A FILM OF UNPOLYMERIZED POLYESTER RESIN TO SAID LAST NAMED WINDING, HEAT CURING THE RESIN TO FORM A RESIN BONDED CYLINDRICAL SECTION OF PIPE, AND THEREAFTER REMOVING THE INTERNAL WINDING OF PARTING MATERIAL.
Claim 3
Dependent Claim
131 words
APPARATUS FOR THE MANUFACTURE OF PIPE WHICH COMPRISES A TUNNEL-TYPE OVEN, A MANDREL EXTENDING LENGTHWISE THROUGH THE OVEN AND PROJECTING OUTWARDLY THEREFROM AT OPPOSITE ENDS, MEANS OPERATIVELY LOCATED ADJACENT ONE PROJECTING END OF THE MANDREL FOR FORMING A SPIRALLY WOUND TUBE UPON THE MANDREL, MEANS FOR COVERING THE TUBE WITH A LAYER OF PARTING MATERIAL, MEANS FOR ROTATIVELY AND TRANSLATIVELY MOVING THE TUBE ALONG THE MANDREL AND THROUGH THE OVEN, MEANS FOR FORMING SUCCESSIVE LAYERS OF SPIRALLY WOUND STRANDS OF TEXTILE-TYPE ROVING UPON THE TUBE, EACH SUCH MEANS COMPRISING AN ANNULAR COLLAR HAVING A PLURALITY OF RADICAL SPOOLS, MEANS ASSOCIATED WITH EACH SPOOL FOR FEEDING A STRAND FROM SUCH SPOOL TO THE MANDREL AND SPIRALLY WINDING SUCH STRAND THEREON AND MEANS FOR APPLYING A NON-POLYMERIZED LIQUID RESIN TO SAID SUCCESSIVE LAYERS.
Claim 4
Dependent Claim
131 words
APPARATUS FOR THE MANUFACTURE OF PIPE WHICH COMPRISES A TUNNEL-TYPE OVEN, A MANDREL EXTENDING LENGTHWISE THROUGH THE OVEN AND PROJECTING OUTWARDLY THEREFROM AT OPPOSITE ENDS, MEANS OPERATIVELY LOCATED ADJACENT ONE PROJECTING END OF THE MANDREL FOR FORMING A SPIRALLY WOUND TUBE UPON THE MANDREL, MEANS FOR COVERING THE TUBE WITH A LAYER OF PARTING MATERIAL, MEANS FOR ROTATIVELY AND TRANSLATIVELY MOVING THE TUBE ALONG THE MANDREL AND THROUGH THE OVEN, MEANS FOR FORMING SUCCESSIVE LAYERS OF SPIRALLY WOUND STRANDS OF TEXTILE-TYPE ROVING UPON THE TUBE, EACH SUCH MEANS COMPRISING AN ANNULAR COLLAR HAVING A PLURALITY OF RADICAL SPOOLS, MEANS ASSOCIATED WITH EACH SPOOL FOR FEEDING A STRAND FROM SUCH SPOOL TO THE MANDREL AND SPIRALLY WINDING SUCH STRAND THEREON AND MEANS FOR APPLYING A NON-POLYMERIZED LIQUID RESIN TO SAID SUCCESSIVE LAYERS.
References Cited (Backward Citations)
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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) | 1959-06-05 | 1959-12-05 | 1960-06-05 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1963-06-05 | 1963-12-05 | 1964-06-05 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1967-06-05 | 1967-12-05 | 1968-06-05 | $7700.00 | Window Closed / Lapsed |