US3354253A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Method and apparatus for stretching thermoplastic film
Assignee: Phillips Petroleum Co
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Filing: 1964-09-28
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Granted: 1967-11-21
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Expires: 1984-09-28
Abstract
No abstract record available.
Inventors
- 👤 Rasmussen Ole-Bendt
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-07 14:58
CPC Classifications
B; B29; B29C; B29C55/00; B29C55/02; B29C55/04; B29C55/045; B29K; B29K2023/00; B29K2023/04; B29K2023/06
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
57 words
A METHOD OF STRETCHING AN ELONGATED SHEET OF PLASTIC FILM WHICH COMPRISES GRIPPING SAID SHEET TRANSVERSELY IN A PLURALITY OF CLOSELY SPACED PARALLEL ZONES WHICH FORM AN ANGLE SUBSTANTIALLY BELOW 90* TO THE LENGTHWISE DIMENSION OF SAID SHEET, MOVVING SAID SHEET FORWARD LENGTHWISE UNDER TENSION WHILE MAINTAINING SAID GRIPPING, GRADUALLY SHIFTING SAID GRIPPING ZONES AXIALLY WHILE MAINTAINING
Claim 2
Independent Claim
57 words
A METHOD OF STRETCHING AN ELONGATED SHEET OF PLASTIC FILM WHICH COMPRISES GRIPPING SAID SHEET TRANSVERSELY IN A PLURALITY OF CLOSELY SPACED PARALLEL ZONES WHICH FORM AN ANGLE SUBSTANTIALLY BELOW 90* TO THE LENGTHWISE DIMENSION OF SAID SHEET, MOVVING SAID SHEET FORWARD LENGTHWISE UNDER TENSION WHILE MAINTAINING SAID GRIPPING, GRADUALLY SHIFTING SAID GRIPPING ZONES AXIALLY WHILE MAINTAINING
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) | 1970-11-20 | 1971-05-22 | 1971-11-21 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1974-11-20 | 1975-05-22 | 1975-11-21 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1978-11-20 | 1979-05-22 | 1979-11-21 | $7700.00 | Window Closed / Lapsed |