US2828239A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Method of continuously forming tubing of plastic material
Assignee: National Fibre Glass Co Inc
•
Filing: 1953-04-03
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Granted: 1958-03-25
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Expires: 1973-04-03
Abstract
No abstract record available.
Inventors
- 👤 Fischer Herbert Corliss
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-25 00:12
CPC Classifications
B; B29; B29C; B29C53/00; B29C53/56; B29C53/58; B29C53/74
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
106 words
THE METHOD OF CONTINUOUSLY FORMING GLASS FIBER TUBING FROM STRIPS OF PHENOL-FORMALDEHYDE RESIN IMPREGNATED GLASS FIBER MATERIAL WHICH COMPRISES THE STEPS OF CONTINUOUSLY FORMING A RIGIDLY SHAPED MANDREL SURFACE, ADVANCING SAID SURFACE THROUGH A PREDETERMINED DISTANCE, AND THEREAFTER COLLAPSING SAID SURFACE, SPIRALLY WINDING SAID PHENOL-FORMALDEHYDE RESIN IMPREGNATED GLASS FIBER STRIP MATERIAL IN OVER-LAPPING RELATION ONTO SAID TRAVELING MANDREL SURFACE, SUBJECTING SAID IMPREGNATED STRIP MATERIAL ON THE MANDREL SURFACE TO HEAT AND EXTERNAL PRESSURE SIMULTANEOUSLY AROUND THE ENTIRE PERIPHERY THEREOF WHILE ADVANCING THROUGH A SUBSTANTIAL DISTANCE WITH SAID MANDREL SURFACE TO FORM HARDENED TUBING OS AID MATERIAL, AND DISCHARGING THE HARDENED TUBING OVER THE COLLAPSING MANDREL SURFACE.
Claim 2
Independent Claim
106 words
THE METHOD OF CONTINUOUSLY FORMING GLASS FIBER TUBING FROM STRIPS OF PHENOL-FORMALDEHYDE RESIN IMPREGNATED GLASS FIBER MATERIAL WHICH COMPRISES THE STEPS OF CONTINUOUSLY FORMING A RIGIDLY SHAPED MANDREL SURFACE, ADVANCING SAID SURFACE THROUGH A PREDETERMINED DISTANCE, AND THEREAFTER COLLAPSING SAID SURFACE, SPIRALLY WINDING SAID PHENOL-FORMALDEHYDE RESIN IMPREGNATED GLASS FIBER STRIP MATERIAL IN OVER-LAPPING RELATION ONTO SAID TRAVELING MANDREL SURFACE, SUBJECTING SAID IMPREGNATED STRIP MATERIAL ON THE MANDREL SURFACE TO HEAT AND EXTERNAL PRESSURE SIMULTANEOUSLY AROUND THE ENTIRE PERIPHERY THEREOF WHILE ADVANCING THROUGH A SUBSTANTIAL DISTANCE WITH SAID MANDREL SURFACE TO FORM HARDENED TUBING OS AID MATERIAL, AND DISCHARGING THE HARDENED TUBING OVER THE COLLAPSING MANDREL SURFACE.
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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) | 1961-03-24 | 1961-09-23 | 1962-03-25 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1965-03-24 | 1965-09-23 | 1966-03-25 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1969-03-24 | 1969-09-23 | 1970-03-25 | $7700.00 | Window Closed / Lapsed |