US4192843A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Method for blow molding of thermoplastic articles
Assignee: Rheem Manufacturing Co
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Filing: 1977-12-12
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Granted: 1980-03-11
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Expires: 1997-12-12
Abstract
Abstract A mixture of water and surfactant is introduced interiorly of a parison in the course of blow molding thereof. Lessening of die closure time and improved conformity of dimensions of molded articles to corresponding dimensions of forming dies are achieved.
Inventors
- 👤 George E. Trieschock
- 👤 George H. Dunbeker
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-28 19:23
CPC Classifications
B; B29; B29C; B29C49/00; B29C49/42; B29C49/64; B29C49/66; B29C49/02; B29C49/04
Claims Analysis
Total Claims: 7
Claim 1
Independent Claim
35 words
In a method comprising the step of introducing pressurized air interiorly of a parison of thermoplastic material at a sufficient pressure to transform the parison into a hollow article, the improvement comprising the steps of:
Claim 2
Dependent Claim
35 words
In a method comprising the step of introducing pressurized air interiorly of a parison of thermoplastic material at a sufficient pressure to transform the parison into a hollow article, the improvement comprising the steps of:
Claim 3
Dependent Claim
34 words
(a) providing a mixture of water and surface active matter, said mixture including said surface active matter in percentage of from 0.023 percent to 0.36 percent of the liquid volume of said mixture; and
Claim 4
Dependent Claim
34 words
(a) providing a mixture of water and surface active matter, said mixture including said surface active matter in percentage of from 0.023 percent to 0.36 percent of the liquid volume of said mixture; and
Claim 5
Dependent Claim
20 words
(b) introducing said mixture into the interior surface of said parison in the course of air pressurization of said parison.
Claim 6
Dependent Claim
20 words
(b) introducing said mixture into the interior surface of said parison in the course of air pressurization of said parison.
Claim 7
Dependent Claim
13 words
The invention claimed in claim 1 wherein said surface active matter is non-crystallizing.
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) | 1983-03-11 | 1983-09-10 | 1984-03-11 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1987-03-11 | 1987-09-10 | 1988-03-11 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1991-03-11 | 1991-09-10 | 1992-03-11 | $7700.00 | Window Closed / Lapsed |