US3929541A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Method for heating thermoplastic elements
Assignee: Phillips Petroleum Co
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Filing: 1974-04-29
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Granted: 1975-12-30
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Expires: 1994-04-29
Abstract
Abstract Ends of two thermoplastic elements are heated to their respective fusion temperatures wherein the fusion temperatures are different and wherein the fusion temperatures are reached at approximately the same time. A heating means having two heating surfaces and an insulating plate are employed to accomplish the heating.
Inventors
- 👤 Johnnie E Spears
- 👤 Donald L Caldwell
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-30 18:18
CPC Classifications
B; B29; B29C; B29C65/00; B29C65/02; B29C65/18; B29C65/20; B29C66/00; B29C66/50; B29C66/51; B29C66/52; B29C66/522; B29C66/5221; B29C66/70; B29C66/73; B29C66/731; B29C66/7311; B29C66/73115; B29C66/73116; B29C66/739; B29C66/7392; B29C66/73921; B29C66/80; B29C66/81; B29C66/818; B29C66/84; B29C66/861; B29C66/90; B29C66/91; B29C66/912; B29C66/9121; B29C66/91211; B29C66/91212; B29C66/91231; B29C66/914; B29C66/9141; B29C66/91421; B29C66/91423; B29C66/9161; B29C66/91641; B29C66/91643; B29C66/91645; B29C66/919; B29C66/9192; B29C66/91921; B29C66/91931; B29C66/71; B29C66/91431; B29C66/91933; B29K; B29K2023/00; B29K2023/04; B29K2023/06; B29K2023/0608; B29K2023/065; B29K2101/00; B29K2101/12; B29K2105/00; B29K2105/06; B29K2105/16; B29L; B29L2023/00; B29L2023/22
Claims Analysis
Total Claims: 7
Claim 1
Independent Claim
219 words
A METHOD FOR HEATING AN END OF A FIRST THERMOSPLASTIC ELEMENT TO A FIRST FUSION TEMPERATURE AND A SECOND THERMOPLASTIC ELEMENT TO A SECOND FUSION TEMPERATURE, WHEREIN THE FUSION TEMPERATURE OF SAID FIRST ELEMENT IS LOWER THAN THE FUSION TEMPERATURE OF THE SECOND ELEMENT AND WHEREIN THE FUSION TEMPERATURE OF BOTH ELEMENTS IS REACHED AT APPROXIMATELY THE SAME TIME, COMPRISING THE STEPS OF: POSITIONING AN INSULTING SURFACE ADJACENT A FIRST HEATING SURFACE OF A HEATING MEANS WHICH HAS TWO HEATING SURFACES TO ESTABLISH AN INSULATED HEATING SURFACE AND A NONINSULATED HEATING SURFACE; PRESSING THE INSULATED HEATING SURFACE AGAINST THE END OF THE FIRST ELEMENT TO BE HEATED; PRESSING THE NONINSULATED HEATING SURFACE AGAINST THE END OF THE SECOND ELEMENT TO BE HEATED; HEATING THE END OF THE SECOND ELEMENT FOR A PERIOD OF TIME X; THEREAFTER REMOVING THE INSULATING SURFACE FROM THE FIRST SURFACE OF THE HEATING MEANS; PRESSING THE NONINSULATED FIRST SURFACE AGAINST THE END OF THE FIRST ELEMENT AND THE NONINSULATED SECOND SURFACE AGAINST THE END OF THE SECOND ELEMENT FOR A PERIOD OF TIME Y; REMOVING THE NONINSULATED SURFACES OF THE HEATING MEANS FROM THE END OF THE ELEMENTS; AND PRESSING THE HEATED ENDS OF THE ELEMENTS TOGETHER WHILE SAID ENDS ARE AT OR ABOVE THEIR RESPECTIVE FUSION TEMPERATURES AND WHILE SAID ENDS ARE PROPERLY ALIGNED.
Claim 2
Independent Claim
219 words
A METHOD FOR HEATING AN END OF A FIRST THERMOSPLASTIC ELEMENT TO A FIRST FUSION TEMPERATURE AND A SECOND THERMOPLASTIC ELEMENT TO A SECOND FUSION TEMPERATURE, WHEREIN THE FUSION TEMPERATURE OF SAID FIRST ELEMENT IS LOWER THAN THE FUSION TEMPERATURE OF THE SECOND ELEMENT AND WHEREIN THE FUSION TEMPERATURE OF BOTH ELEMENTS IS REACHED AT APPROXIMATELY THE SAME TIME, COMPRISING THE STEPS OF: POSITIONING AN INSULTING SURFACE ADJACENT A FIRST HEATING SURFACE OF A HEATING MEANS WHICH HAS TWO HEATING SURFACES TO ESTABLISH AN INSULATED HEATING SURFACE AND A NONINSULATED HEATING SURFACE; PRESSING THE INSULATED HEATING SURFACE AGAINST THE END OF THE FIRST ELEMENT TO BE HEATED; PRESSING THE NONINSULATED HEATING SURFACE AGAINST THE END OF THE SECOND ELEMENT TO BE HEATED; HEATING THE END OF THE SECOND ELEMENT FOR A PERIOD OF TIME X; THEREAFTER REMOVING THE INSULATING SURFACE FROM THE FIRST SURFACE OF THE HEATING MEANS; PRESSING THE NONINSULATED FIRST SURFACE AGAINST THE END OF THE FIRST ELEMENT AND THE NONINSULATED SECOND SURFACE AGAINST THE END OF THE SECOND ELEMENT FOR A PERIOD OF TIME Y; REMOVING THE NONINSULATED SURFACES OF THE HEATING MEANS FROM THE END OF THE ELEMENTS; AND PRESSING THE HEATED ENDS OF THE ELEMENTS TOGETHER WHILE SAID ENDS ARE AT OR ABOVE THEIR RESPECTIVE FUSION TEMPERATURES AND WHILE SAID ENDS ARE PROPERLY ALIGNED.
Claim 3
Dependent Claim
48 words
The method of claim 1 wherein Y equals the heating time required to heat the end of the first element to the first fusion temperature, and wherein X + Y equals the heating time required to heat the end of the second element to the second fusion temperature.
Claim 4
Dependent Claim
10 words
The method of claim 1 wherein the elements are conduits.
Claim 5
Dependent Claim
10 words
The method of claim 3 wherein the conduits are polyethylene.
Claim 6
Dependent Claim
22 words
The method of claim 1 wherein the insulating surface consists of two outer sheets of aluminum and an inner sheet of asbestos.
Claim 7
Dependent Claim
15 words
The method of claim 1 wherein the heating means is an electrically operated hot plate.
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) | 1978-12-29 | 1979-06-30 | 1979-12-30 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1982-12-29 | 1983-06-30 | 1983-12-30 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1986-12-29 | 1987-06-30 | 1987-12-30 | $7700.00 | Window Closed / Lapsed |