Patent US3296343A successfully refreshed from Google Patents.
US3296343A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Method and apparatus for producing blown thermoplastic tubing
Assignee: Phillips Petroleum Co
•
Filing: 1963-03-27
•
Granted: 1967-01-03
•
Expires: 1983-03-27
Abstract
No abstract record available.
Inventors
- 👤 Doyle D Buttolph
- 👤 Louis C Bearer
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-25 22:02
CPC Classifications
B; B29; B29C; B29C48/00; B29C48/03; B29C48/09; B29C48/10; B29C48/001; B29C48/0018; B29C48/0019; B29C48/25; B29C48/355
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
132 words
IN THE METHOD OF PREPARING CONTINUOUS, SEAMLESS TUBING OF THERMOPLASTIC MATERIAL, WHEREIN SUCH MATERIAL IS MELTED AND EXTRUDED THROUGH AN ANNULAR ORIFICE IN THE FORM OF TUBING, COOLED, INFLATED, AND PULLED IN A LONGITUDINAL DIRECTION, THE IMPROVEMENT COMPRISING PASSING SAID TUBING THROUGH AN ANNULAR ZONE WHEREIN ROTATING COMPRESSIVE FORCE IS APPLIED TO THE PERIPHERAL PORTION OF THE TUBING AS IT PASSES THROUGH SAID ANNULAR ZONE IN ITS PARTIALLY CRYSTALLIZED STATE, BY APPLYING A ROTATING FORCE AGAINST THE INTERIOR SURFACE OF SAID TUBING TRANSVERSE TO THE LONGITUDINAL DIRECTIN AND SIMULTANEOUSLY APPLYING AN OPPOSITELY ROTATING FORCE AGAINST THE EXTERIOR SURFACE OF SAID TUBING ADJACENT SAID ROTATING FORCE SO AS TO COMPRESS SAID TUBING IN THE TRANSVERSE DIRECTION, SAID ROTATING FORCE AND SAID OPPOSITELY ROTATING FORCE HAVING A RESULTANT SUBSTANTIALLY ZERO TORQUE ON SAID TUBING.
Claim 2
Dependent Claim
132 words
IN THE METHOD OF PREPARING CONTINUOUS, SEAMLESS TUBING OF THERMOPLASTIC MATERIAL, WHEREIN SUCH MATERIAL IS MELTED AND EXTRUDED THROUGH AN ANNULAR ORIFICE IN THE FORM OF TUBING, COOLED, INFLATED, AND PULLED IN A LONGITUDINAL DIRECTION, THE IMPROVEMENT COMPRISING PASSING SAID TUBING THROUGH AN ANNULAR ZONE WHEREIN ROTATING COMPRESSIVE FORCE IS APPLIED TO THE PERIPHERAL PORTION OF THE TUBING AS IT PASSES THROUGH SAID ANNULAR ZONE IN ITS PARTIALLY CRYSTALLIZED STATE, BY APPLYING A ROTATING FORCE AGAINST THE INTERIOR SURFACE OF SAID TUBING TRANSVERSE TO THE LONGITUDINAL DIRECTIN AND SIMULTANEOUSLY APPLYING AN OPPOSITELY ROTATING FORCE AGAINST THE EXTERIOR SURFACE OF SAID TUBING ADJACENT SAID ROTATING FORCE SO AS TO COMPRESS SAID TUBING IN THE TRANSVERSE DIRECTION, SAID ROTATING FORCE AND SAID OPPOSITELY ROTATING FORCE HAVING A RESULTANT SUBSTANTIALLY ZERO TORQUE ON SAID TUBING.
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) | 1970-01-02 | 1970-07-04 | 1971-01-03 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1974-01-02 | 1974-07-04 | 1975-01-03 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1978-01-02 | 1978-07-04 | 1979-01-03 | $7700.00 | Window Closed / Lapsed |