Patent US2857931A successfully refreshed from Google Patents.
US2857931A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Insulated pipe and method of making the same
Assignee: R W Mfg CO
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Filing: 1955-03-24
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Granted: 1958-10-28
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Expires: 1975-03-24
Abstract
No abstract record available.
Inventors
- 👤 William R Lawton
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-24 08:46
CPC Classifications
F; F16; F16L; F16L59/00; F16L59/04; F16L59/02; F16L59/029; F16L59/14; F16L59/16; F16L59/18; F16L59/20; Y; Y10; Y10S; Y10S138/00; Y10S138/09; Y10S220/00; Y10S220/902; Y10T; Y10T29/00; Y10T29/49; Y10T29/49428; Y10T29/49826; Y10T29/49879; Y10T29/49893
Claims Analysis
Total Claims: 4
Claim 1
Independent Claim
68 words
AN INSULATED PIPE UNIT FOR CONVEYING FLUIDS COMPRISING A LENGTH OF PIPE, A THIN BONDING SKIN OF LAYER ON SAID PIPE OUTR SURFACE, AND AN OUTER BODY OF AN INSULATING COMPOSITION COMPRISING A FORMED CELLULAR SYNTHETIC RESINOUS COMPOSITION HAVING AN EFFECTIVE THERMAL RESISTANCE SUBSTANTIALLY BETWEEN -20*F. AND 340*F. BONDED TO SAID THIN LAYER, THE OUTER EXPOSED SURFACE OF SAID COMPOSITION BEING SMOOTH AND SUBSTANTIALLY FREE OF OPEN VOIDS.
Claim 2
Dependent Claim
68 words
AN INSULATED PIPE UNIT FOR CONVEYING FLUIDS COMPRISING A LENGTH OF PIPE, A THIN BONDING SKIN OF LAYER ON SAID PIPE OUTR SURFACE, AND AN OUTER BODY OF AN INSULATING COMPOSITION COMPRISING A FORMED CELLULAR SYNTHETIC RESINOUS COMPOSITION HAVING AN EFFECTIVE THERMAL RESISTANCE SUBSTANTIALLY BETWEEN -20*F. AND 340*F. BONDED TO SAID THIN LAYER, THE OUTER EXPOSED SURFACE OF SAID COMPOSITION BEING SMOOTH AND SUBSTANTIALLY FREE OF OPEN VOIDS.
Claim 3
Independent Claim
116 words
THE METHOD OF MAKING INSULATED PIPE UNITS FOR USE IN A FLUID DISTRIBUTION SYSTEM WHICH COMPRISES THE STEPS OF APPLYING A THIN LAYER OF RESINOUS MATERIAL TO A CLEANED OUTER PIPE SURFACE, THEN SURROUNDING SAID PIPE WITH A MOLD TO PROVIDE A SPACE BETWEEN THE MOLD AND THE LAYER FOR RECEIVING A SYNTHETIC INSULATION COMPOSITION HAVING AN EFFECTIVE THERMAL RESISTANCE SUBSTANTIALLY BETWEEN -20*F. AND 340*F., DELIVERING A PREDETERMINED QUANTITY OF SAID COMPOSITION INTO SSID SPACE, THEN EXPAND TO ING SAID COMPOSITION TO FAOM IN PLACE AND TO EXPAND TO SUBSTANTIALLY FILL SAID SAPCE, ALLOWING SAID FOAMED COMPOSITION TO SET, THEN REMOVING SAID MOLD, AND THEN FORMING A SMOOTH OUTER EXPOSED SURFACE TO SAID SET FOAMED COMPOSITION.
Claim 4
Independent Claim
116 words
THE METHOD OF MAKING INSULATED PIPE UNITS FOR USE IN A FLUID DISTRIBUTION SYSTEM WHICH COMPRISES THE STEPS OF APPLYING A THIN LAYER OF RESINOUS MATERIAL TO A CLEANED OUTER PIPE SURFACE, THEN SURROUNDING SAID PIPE WITH A MOLD TO PROVIDE A SPACE BETWEEN THE MOLD AND THE LAYER FOR RECEIVING A SYNTHETIC INSULATION COMPOSITION HAVING AN EFFECTIVE THERMAL RESISTANCE SUBSTANTIALLY BETWEEN -20*F. AND 340*F., DELIVERING A PREDETERMINED QUANTITY OF SAID COMPOSITION INTO SSID SPACE, THEN EXPAND TO ING SAID COMPOSITION TO FAOM IN PLACE AND TO EXPAND TO SUBSTANTIALLY FILL SAID SAPCE, ALLOWING SAID FOAMED COMPOSITION TO SET, THEN REMOVING SAID MOLD, AND THEN FORMING A SMOOTH OUTER EXPOSED SURFACE TO SAID SET FOAMED COMPOSITION.
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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) | 1961-10-27 | 1962-04-28 | 1962-10-28 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1965-10-27 | 1966-04-28 | 1966-10-28 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1969-10-27 | 1970-04-28 | 1970-10-28 | $7700.00 | Window Closed / Lapsed |