Patent US2952867A successfully refreshed from Google Patents.
US2952867A
Expired / Lapsed
US
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Process for the production of thermoplastic films
Assignee: Hoechst AG
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Filing: 1956-11-23
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Granted: 1960-09-20
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Expires: 1976-11-23
Abstract
No abstract record available.
Inventors
- 👤 Diedrich Georg
- 👤 Gaube Erwin
- 👤 Richard Kurt
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 16:15
CPC Classifications
B; B29; B29C; B29C55/00; B29C55/28; B29C55/02; B29C55/10; Y; Y10; Y10S; Y10S264/00; Y10S264/73
Claims Analysis
Total Claims: 1
Claim 1
Independent Claim
98 words
APPARATUS FOR PRODUCTION OF THERMOPLASTIC FILM HAVING THREE DIMENSIONAL ORIENTATION WHICH COMPRISES MEANS FOR HEATING UNIFORMLY AN ANNULAR SECTION OF A TUBE OF ORIENTABLE PLASTIC IN A HEATING ZONE, MEANS FOR MOVING SAID HEATED TUBE OUT OF SAID HEATING ZONE, MEANS FOR CREATING A POSITIVE PRESSURE WITHIN THE TUBE TO CAUSE SPHERICAL EXPANSION OF SAID HEATED CROSS-SECTION TO TAKE PLACE, MEANS FOR ANNULARLY COOLING THE SPHERICALLY EXPANDED TUBE AT THE POINT OF TANGENCY OF THE WALLS OF THE ENLARGED TUBE THUS FORMED AND THE WALLS OF THE SPHERICAL SECTION AND MEANS FOR MOVING SAID ENLARGED TUBE INCREMENTALLY FORWARD.
References Cited (Backward Citations)
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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) | 1963-09-20 | 1964-03-21 | 1964-09-20 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1967-09-20 | 1968-03-21 | 1968-09-20 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1971-09-20 | 1972-03-21 | 1972-09-20 | $7700.00 | Window Closed / Lapsed |