US3721269A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Oriented polybutene-1 tubing
Assignee: Texas Petrochemicals Corp
•
Filing: 1970-11-23
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Granted: 1973-03-20
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Expires: 1990-11-23
Abstract
Abstract Oriented polybutene-1 flexible, collapsible tubing having the highest degree of tear strength is obtained by maintaining the ratio of machine direction orientation to transverse direction orientation in the range of about 0.7 to 0.9. Unexpectedly this ratio rather than a ratio of 1.Q which represents a balanced film gives the best tear strengths because of the crease lines formed in the tubing during production. The crease lines have a tear strength that totally disrupts the expectable and predictable tear properties of the tubing.
Inventors
- 👤 L Choate
- 👤 G Click
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-29 18:38
CPC Classifications
B; B29; B29C; B29C48/00; B29C48/03; B29C48/09; B29C48/001; B29C48/0018; B29C48/0019; B29C48/10
Claims Analysis
Total Claims: 1
Claim 1
Independent Claim
16 words
A flexible, collapsible tubing as claimed in claim 1 wherein BU varies from 1 to 2.25.
References Cited (Backward Citations)
US2643027A
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US3167814A
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US3300555A
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US3234312A
Cited
US3532366A
Cited
US3385817A
Cited
US3508587A
Cited
US3551540A
Cited
US3576051A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1976-03-19 | 1976-09-18 | 1977-03-20 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1980-03-19 | 1980-09-18 | 1981-03-20 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1984-03-19 | 1984-09-18 | 1985-03-20 | $7700.00 | Window Closed / Lapsed |