US2888042A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Reinforced polytetrafluoroethylene pipe and method of making it
Assignee: Resistoflex Corp
•
Filing: 1955-01-14
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Granted: 1959-05-26
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Expires: 1975-01-14
Abstract
No abstract record available.
Inventors
- 👤 John Alexander N T St
- 👤 Benjamin M Walker
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 17:22
CPC Classifications
F; F16; F16L; F16L9/00; F16L9/12; B; B29; B29D; B29D23/00; B32; B32B; B32B27/00; B32B27/30; F16L47/00; F16L47/14; Y; Y10; Y10S; Y10S285/00; Y10S285/911
Claims Analysis
Total Claims: 4
Claim 1
Independent Claim
41 words
CHEMICALLY INERT PIPE COMPRISING A LINING OF P.AT.F.E. BONDED TO AT LEAST ONE LAYER OF REINFORCONG GLASS FABRIC PRE-IMPREGNATED WITH P.T.F.E., SAID LINING BEING ATHE RESULT OF SINTERING IN SITU UNFUSED PASTE-EXTRUDED P.T.F.E. LAMINATED WITH SAID REINFOARCING LAYER INTO PIPE FORM.
Claim 2
Dependent Claim
41 words
CHEMICALLY INERT PIPE COMPRISING A LINING OF P.AT.F.E. BONDED TO AT LEAST ONE LAYER OF REINFORCONG GLASS FABRIC PRE-IMPREGNATED WITH P.T.F.E., SAID LINING BEING ATHE RESULT OF SINTERING IN SITU UNFUSED PASTE-EXTRUDED P.T.F.E. LAMINATED WITH SAID REINFOARCING LAYER INTO PIPE FORM.
Claim 3
Independent Claim
80 words
THE METHOD OF MAKING CHEMICALLY INERT PIPE WHICH COMPRISES THE STEPS OF PLACING ON A MANDREL A CONTINUOUS LAYER OF UNFUSED PASTE EXTRUDED P.T.F.E. FREE OF VOLATILE CONSTITUENTS, WRAPPING THEREON AT LEAST ONE LAYER OF P.T.F.E.-IMPREGNATED GLASS FABRIC, HEATING SAID LAYERS ON THE MANDREL UNDER EXTERNALLY APPLIED PRESSURE TO A TEMPERATURE ABOVE THE FUSION TEMPERATURE AND BELOW THE DECOMPOSITION TEMPERATURE OF P.T.F.E. TO SINTER THE UNFUSED P.T.F.E. AND BOND SAID LAYERS TOGETHER, AND REMOVING THE RESULTANT PIPE FROM THE MANDREL.
Claim 4
Independent Claim
80 words
THE METHOD OF MAKING CHEMICALLY INERT PIPE WHICH COMPRISES THE STEPS OF PLACING ON A MANDREL A CONTINUOUS LAYER OF UNFUSED PASTE EXTRUDED P.T.F.E. FREE OF VOLATILE CONSTITUENTS, WRAPPING THEREON AT LEAST ONE LAYER OF P.T.F.E.-IMPREGNATED GLASS FABRIC, HEATING SAID LAYERS ON THE MANDREL UNDER EXTERNALLY APPLIED PRESSURE TO A TEMPERATURE ABOVE THE FUSION TEMPERATURE AND BELOW THE DECOMPOSITION TEMPERATURE OF P.T.F.E. TO SINTER THE UNFUSED P.T.F.E. AND BOND SAID LAYERS TOGETHER, AND REMOVING THE RESULTANT PIPE FROM THE MANDREL.
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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) | 1962-05-25 | 1962-11-24 | 1963-05-26 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1966-05-25 | 1966-11-24 | 1967-05-26 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1970-05-25 | 1970-11-24 | 1971-05-26 | $7700.00 | Window Closed / Lapsed |