Thermoplastic screw-threaded closure cap
US4349116A · kind A · utility
27Cited by
3References
13Claims
0Family size
Assignee
Inventor
Key dates
| Filing date | Jul 25, 1979 |
| Grant date | Sep 14, 1982 |
| Priority date | — |
| Expiry date | Jul 25, 1999 |
Classification
- Technology area (CPC B)Performing Operations; Transporting
- CPC primaryB65D41/0428
- WIPO fieldHandling
- WIPO sectorMechanical engineering
Abstract
A thermoplastic cap having improved anti-backoff characteristics features a primary helical thread and a coaxial secondary thread. The cap is of a thermoplastic material having an elastic modulus in flexure within the range of from about 0.2.times.10.sup.5 to about 10.sup.6 pounds per square inch so that the secondary helical thread will flex in response to tightening torque.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.