Patent USD323890S successfully refreshed from Google Patents.
US2781551A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Method of making hollow containers
Assignee: Individual
•
Filing: 1952-01-05
•
Granted: 1957-02-19
•
Expires: 1972-01-05
Abstract
No abstract record available.
Inventors
- 👤 Louis J Richerod
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 01:49
CPC Classifications
B; B29; B29C; B29C49/00; B29C49/22
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
157 words
THE METHOD OF FORMING A TUBULAR MEMBER OF INTEGRATED POLYETHYLENE AND VINYL RESIN WHICH IS ADAPTED TO BE USED AS A CONTAINER, WHICH COMPRISES MECHANICALLY COMPRESSING TO A SHEET OF POLYETHYLENE A SHEET OF VINYL RESIN PLASTICIZED TO RENDER IT FLEXIBLE BUT WITH A SLIGHTLY HIGHER SOFTENING POINT THAN THE POLYETHYLENE, FORMING SUCH COMPOSITE MASS INTO A TUBE WITH THE POLYETHYLENE INSIDE, HEATING SUCH TUBE TO A TEMPERATURE AT WHICH THE VINYL RESIN CAN BE STRETCHED AND AT WHICH THE POLYETHYLENE WILL FLOW READILY UNDER PRESSURE, AND WHILE SO HEATED EXPANDING SUCH TUBE BY INTERNAL FLUID PRESSURE WHEREBY THE VINYL RESIN IS CAUSED TO STRETCH TO THE DESIRED SHAPE AND THE POLYETHYLENE LINER IS CAUSED TO FLOW TO KEEP THE INSIDE SURFACE OF THE VINYL RESIN COVERED AND TO UNITE WITH THE VINYL RESIN TO FORM A SUBSTANTIALLY INTEGRAL SHEET SO THAT THE TUBULAR MEMBER WILL FLEXIBLE WITH NO TENDENCY FOR THE LAYERS TO SEPARATE IN USE.
Claim 2
Independent Claim
157 words
THE METHOD OF FORMING A TUBULAR MEMBER OF INTEGRATED POLYETHYLENE AND VINYL RESIN WHICH IS ADAPTED TO BE USED AS A CONTAINER, WHICH COMPRISES MECHANICALLY COMPRESSING TO A SHEET OF POLYETHYLENE A SHEET OF VINYL RESIN PLASTICIZED TO RENDER IT FLEXIBLE BUT WITH A SLIGHTLY HIGHER SOFTENING POINT THAN THE POLYETHYLENE, FORMING SUCH COMPOSITE MASS INTO A TUBE WITH THE POLYETHYLENE INSIDE, HEATING SUCH TUBE TO A TEMPERATURE AT WHICH THE VINYL RESIN CAN BE STRETCHED AND AT WHICH THE POLYETHYLENE WILL FLOW READILY UNDER PRESSURE, AND WHILE SO HEATED EXPANDING SUCH TUBE BY INTERNAL FLUID PRESSURE WHEREBY THE VINYL RESIN IS CAUSED TO STRETCH TO THE DESIRED SHAPE AND THE POLYETHYLENE LINER IS CAUSED TO FLOW TO KEEP THE INSIDE SURFACE OF THE VINYL RESIN COVERED AND TO UNITE WITH THE VINYL RESIN TO FORM A SUBSTANTIALLY INTEGRAL SHEET SO THAT THE TUBULAR MEMBER WILL FLEXIBLE WITH NO TENDENCY FOR THE LAYERS TO SEPARATE IN USE.
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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) | 1960-02-19 | 1960-08-20 | 1961-02-19 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1964-02-19 | 1964-08-20 | 1965-02-19 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1968-02-19 | 1968-08-20 | 1969-02-19 | $7700.00 | Window Closed / Lapsed |