Patent US3613155A successfully refreshed from Google Patents.
US3613155A
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US
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Apparatus for stretching thermoplastic
Assignee: DAN E BLOXSOM
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Filing: 1969-04-07
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Granted: 1971-10-19
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Expires: 1989-04-07
Abstract
Abstract A METHOD AND APPARATUS FOR STRETCHING A SHEET OF THERMOPLASTIC MATERIAL TO INCREASE SUBSTANTIALLY THE SURFACE AREA THEREOF WHILE SIMULTANEOUSLY INCREASING STRENGTH OF THE MATERIAL. IN ONE EMBODIMENT, OPPOSED ENDS OF THE SHEET ARE SUPPORTED AND MOVED THROUGH AN ARCUATE PATH IN OPPOSITE DIRECTIONS UNTIL THE ENDS ARE IN A SUBSTANTIALLY HORIZONTAL COPLANAR RELATION. IN ANOTHER EMBODIMENT, OPPOSED ENDS OF THE SHEET ARE SUPPORTED AND ROTATED AXIALLY IN OPPOSITE DIRECTIONS AND THEN FORCED APART IN OPPOSITE DIRECTIONS IN COPLANAR RELATIONSHIP.
Inventors
- 👤 Dan E Bloxsom
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-08 18:02
CPC Classifications
B; B29; B29C; B29C55/00; B29C55/02; B29C55/04; Y; Y10; Y10S; Y10S425/00; Y10S425/053
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
No citation records indexed.
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1974-10-18 | 1975-04-19 | 1975-10-19 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1978-10-18 | 1979-04-19 | 1979-10-19 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1982-10-18 | 1983-04-19 | 1983-10-19 | $7700.00 | Window Closed / Lapsed |