Patent US3178495A successfully refreshed from Google Patents.
US3178495A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Process for the production of thermoplastic films
Assignee: Hoechst AG
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Filing: 1961-10-09
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Granted: 1965-04-13
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Expires: 1981-10-09
Abstract
No abstract record available.
Inventors
- 👤 Richard Kurt
- 👤 Diedrich Georg
- 👤 Gaube Erwin
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 19:36
CPC Classifications
B; B29; B29C; B29C55/00; B29C55/28
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
142 words
IN THE PROCESS FOR THE PRODUCTION OF A THERMOPLASTIC FILM HAVING MULTIAXIAL ORIENTATION BY SPHERICALLY EXPANDING A HEATED TUBULAR SECTION OF THERMOPLASTIC ORIENTABLE MATERIAL BY INTERNAL PRESSURE TO EFFECT ORIENTATION, PROGRESSIVELY HEMISPHERICALLY EXPANDING SAID TUBULAR SECTION, AND SUBSEQUENTLY COOLING THE ORIENTED EXPANDED SECTION TO SET THE ORIENTATION, SAID COOLING BEING EFFECTED IN A CONFINING MEANS WHICH PREVENTS FURTHER RADIAL EXPANSION, THE IMPROVEMENT WHEREIN PRIOR TO THE EXPANSION ONE CONCENTRICAL PART OF THE CROSS-SECTIONAL AREA OF THE TUBE IS BROUGHT TO A TEMPERATURE WITHIN THE RANGE BETWEEN THE CRYSTALLITE MELTING POINT OF THE THERMOPLASTIC MATERIAL AND 60*C. BELOW SAID POINT, THE OTHER CONCENTRICAL PART OF THE CROSS-SECTIONAL AREA OF SAID TUBE IS BROUGHT TO THE MOLTEN STATE HAVING A TEMPERATURE IN THE RANGE BETWEEN THE CRYSTALLITE MELTING POINT AND A TEMPERATURE ABOVE THE CRYSTALLITE MELTING POINT AND SAID TEMPERATURE ARE MAINTAINED DURING EXPANSION.
Claim 2
Dependent Claim
142 words
IN THE PROCESS FOR THE PRODUCTION OF A THERMOPLASTIC FILM HAVING MULTIAXIAL ORIENTATION BY SPHERICALLY EXPANDING A HEATED TUBULAR SECTION OF THERMOPLASTIC ORIENTABLE MATERIAL BY INTERNAL PRESSURE TO EFFECT ORIENTATION, PROGRESSIVELY HEMISPHERICALLY EXPANDING SAID TUBULAR SECTION, AND SUBSEQUENTLY COOLING THE ORIENTED EXPANDED SECTION TO SET THE ORIENTATION, SAID COOLING BEING EFFECTED IN A CONFINING MEANS WHICH PREVENTS FURTHER RADIAL EXPANSION, THE IMPROVEMENT WHEREIN PRIOR TO THE EXPANSION ONE CONCENTRICAL PART OF THE CROSS-SECTIONAL AREA OF THE TUBE IS BROUGHT TO A TEMPERATURE WITHIN THE RANGE BETWEEN THE CRYSTALLITE MELTING POINT OF THE THERMOPLASTIC MATERIAL AND 60*C. BELOW SAID POINT, THE OTHER CONCENTRICAL PART OF THE CROSS-SECTIONAL AREA OF SAID TUBE IS BROUGHT TO THE MOLTEN STATE HAVING A TEMPERATURE IN THE RANGE BETWEEN THE CRYSTALLITE MELTING POINT AND A TEMPERATURE ABOVE THE CRYSTALLITE MELTING POINT AND SAID TEMPERATURE ARE MAINTAINED DURING EXPANSION.
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) | 1968-04-12 | 1968-10-12 | 1969-04-13 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1972-04-12 | 1972-10-12 | 1973-04-13 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1976-04-12 | 1976-10-12 | 1977-04-13 | $7700.00 | Window Closed / Lapsed |