US3279501A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Extrusion and product
Assignee: Dow Chemical Co
•
Filing: 1965-01-28
•
Granted: 1966-10-18
•
Expires: 1985-01-28
Abstract
No abstract record available.
Inventors
- 👤 Donald Harold Jack
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 19:33
CPC Classifications
B; B29; B29C; B29C48/00; B29C48/25; B29C48/30; B29C48/32; B29C48/33; B29C48/03; B29C48/09
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
78 words
IN AN EXTRUDED SYNTHETIC RESINOUS THERMOPLASTIC CYLINDRICAL TUBULAR OBJECT HAVING LINEAR ZONES OF WEAKNESS WHICH EXTEND IN A GENERALLY LONGITUDINAL DIRECTION, THE IMPROVEMENT WHICH COMPRISES PROVIDING GENERALLY HELICAL ORIENTATION OF THE PORTIONS OF THE OBJECT LYING BETWEEN THE INNER SURFACE AND THE OUTER SURFACE, THE HELICAL PATTERN OF ORIENTATION INCREASING TOWARD THE SURFACE, AND THE HELICAL PATTERN OF ORIENTATION ADJACENT THE INNER SURFACE BEING OF OPPOSITE AND HAND TO THE HELICAL PATTERN OF ORIENTATION ON THE OUTER SURFACE.
Claim 2
Dependent Claim
78 words
IN AN EXTRUDED SYNTHETIC RESINOUS THERMOPLASTIC CYLINDRICAL TUBULAR OBJECT HAVING LINEAR ZONES OF WEAKNESS WHICH EXTEND IN A GENERALLY LONGITUDINAL DIRECTION, THE IMPROVEMENT WHICH COMPRISES PROVIDING GENERALLY HELICAL ORIENTATION OF THE PORTIONS OF THE OBJECT LYING BETWEEN THE INNER SURFACE AND THE OUTER SURFACE, THE HELICAL PATTERN OF ORIENTATION INCREASING TOWARD THE SURFACE, AND THE HELICAL PATTERN OF ORIENTATION ADJACENT THE INNER SURFACE BEING OF OPPOSITE AND HAND TO THE HELICAL PATTERN OF ORIENTATION ON THE OUTER SURFACE.
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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) | 1969-10-17 | 1970-04-18 | 1970-10-18 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1973-10-17 | 1974-04-18 | 1974-10-18 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1977-10-17 | 1978-04-18 | 1978-10-18 | $7700.00 | Window Closed / Lapsed |