US3787170A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Rapid heating of parison preforms
Assignee: Phillips Petroleum Co
•
Filing: 1972-10-20
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Granted: 1974-01-22
•
Expires: 1992-10-20
Abstract
Abstract Tubular parison preforms are heated to orientation temperature by means of external radiant heat combined with affirmative heating of the parison on the inside.
Inventors
- 👤 D Gilbert
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-24 19:52
CPC Classifications
B; B29; B29C; B29C49/00; B29C49/42; B29C49/64; B29C49/6409; B29C49/6418; B29B; B29B13/00; B29B13/02; B29B13/023; B29B13/024; B29C49/68; B29C2949/00; B29C2949/07; B29C2949/079; B29C2949/08; B29C49/6436; B29C49/6462; B29C49/682; B29K; B29K2023/00; B29K2023/10; B29K2023/12; B29K2105/00; B29K2105/25; B29K2105/253; B29K2105/258; B29L; B29L2023/00; B29L2023/22
Claims Analysis
Total Claims: 7
Claim 1
Independent Claim
53 words
A method of heating a hollow open end tubular thermoplastic parison to orientation temperature comprising: introducing said parison into a radiant heating zone to apply radiant heat to the outside thereof; affirmatively applying heat to the interior of said parison; and removing said thus-heated parison from said heating zone while at orientation temperature.
Claim 2
Independent Claim
53 words
A method of heating a hollow open end tubular thermoplastic parison to orientation temperature comprising: introducing said parison into a radiant heating zone to apply radiant heat to the outside thereof; affirmatively applying heat to the interior of said parison; and removing said thus-heated parison from said heating zone while at orientation temperature.
Claim 3
Dependent Claim
25 words
A method according to claim 1 wherein said heat is applied to said interior by circulating hot air axially through said interior of said parison.
Claim 4
Dependent Claim
23 words
A method according to claim 1 wherein said heat is applied to said interior of said parison from an internally disposed heat source.
Claim 5
Dependent Claim
21 words
A method according to claim 1 wherein said radiant heating zone is in a circulating air oven having radiant heating panels.
Claim 6
Dependent Claim
24 words
A method according to claim 1 wherein said parison is made of polypropylene and is heated to a temperature within the range of 310*-330*F.
Claim 7
Dependent Claim
18 words
A method according to claim 1 wherein said parisons are rotated about their longitudinal axis during said heating.
References Cited (Backward Citations)
US2100222A
Cited
US3278665A
Cited
US3283047A
Cited
US3586748A
Cited
US3477700A
Cited
US3627282A
Cited
US3554506A
Cited
US3662049A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1977-01-21 | 1977-07-23 | 1978-01-22 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1981-01-21 | 1981-07-23 | 1982-01-22 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1985-01-21 | 1985-07-23 | 1986-01-22 | $7700.00 | Window Closed / Lapsed |