US4294370A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Threaded closure and container
Assignee: Individual
•
Filing: 1980-03-24
•
Granted: 1981-10-13
•
Expires: 2000-03-24
Abstract
Abstract A screw-type closure molded of resilient plastic is provided with an internal thread having a smaller axial pitch spacing than the mating external thread of the container with which it is used, the difference between the two threads being designed to compensate for a number of variables affecting sidewall characteristics around the circumference of the closure, in order to secure more uniform application of sealing pressure and other advantages.
Inventors
- 👤 Thurston H. Toeppen
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-01 22:10
CPC Classifications
B; B65; B65D; B65D41/00; B65D41/02; B65D41/04; B65D41/0407; B65D41/0428
Claims Analysis
Total Claims: 6
Claim 1
Independent Claim
118 words
A closure device of resilient material, in combination with a container having an external screw thread of less resilient material, comprising: a circular crown disc, a cylindrical sidewall or skirt depending from said disc and perpendicular to it, an internal screw thread within said sidewall to mate with said external screw thread, and sealing means integral with the inside surface of said crown disc for mating contact with the upper rim of the opening of said container; said internal thread having an initial axial pitch shorter than the initial axial pitch of said external thread by an amount proportional to the difference in the effective elasticities of said materials and to the axial pitch of said external thread.
Claim 2
Dependent Claim
118 words
A closure device of resilient material, in combination with a container having an external screw thread of less resilient material, comprising: a circular crown disc, a cylindrical sidewall or skirt depending from said disc and perpendicular to it, an internal screw thread within said sidewall to mate with said external screw thread, and sealing means integral with the inside surface of said crown disc for mating contact with the upper rim of the opening of said container; said internal thread having an initial axial pitch shorter than the initial axial pitch of said external thread by an amount proportional to the difference in the effective elasticities of said materials and to the axial pitch of said external thread.
Claim 3
Dependent Claim
30 words
A closure device as in claim 1, in which said initially-different axial pitches of said threads become effectively equal after final installation of closure and concomitant deflections of said threads.
Claim 4
Dependent Claim
35 words
A closure device as in claim 1, in which the final axial pressure per unit of contact length between said sealing means and said upper rim is substantially equal around the circumference of said closure.
Claim 5
Dependent Claim
30 words
A closure device as in claim 1, in which the final axial pressure per unit of contact length between said threads is substantially equal around the circumference of said closure.
Claim 6
Dependent Claim
37 words
A closure device as in claim 1, in which the final axial tension per unit of cross-section area in said sidewall, between said internal thread and said seal, is substantially equal around the circumference of said closure.
References Cited (Backward Citations)
US4231480A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1984-10-12 | 1985-04-13 | 1985-10-13 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1988-10-12 | 1989-04-13 | 1989-10-13 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1992-10-12 | 1993-04-13 | 1993-10-13 | $7700.00 | Window Closed / Lapsed |