US4420081A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Step-wall nestable cup
Assignee: Dart Container Corp
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Filing: 1981-06-22
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Granted: 1983-12-13
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Expires: 2001-06-22
Abstract
Abstract A step-wall nestable cup provided with off-set thin sidewall portions which overlap to define an annular intermediate thickened wall portion which strengthens the cup while permitting the use of relatively thinner wall portions thereabove and therebelow. The use of off-set overlapping thin wall sidewall portions also permits the use of a lower density plastic material without increasing the stack height of the nesting cups while resulting in significant material and/or shipping cost savings without sacrificing overall sidewall strength of the resultant nestable cup or container. A modified step-wall nestable cup is provided with multiple off-set thin sidewall portions which respectively overlap to provide a plurality of annular thickened sidewall portions in the sidewall thereof.
Inventors
- 👤 Kenneth B. Dart
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-03 19:52
CPC Classifications
B; B65; B65D; B65D1/00; B65D1/22; B65D1/26; B65D1/265
Claims Analysis
Total Claims: 8
Claim 1
Independent Claim
116 words
A step-wall nestable cup comprising: a base portion having an integrally formed sidewall extending upwardly therefrom to terminate at an upper peripheral edge so as to define a container, said sidewall including a first lower inner wall surface tapering upwardly to an outwardly extending inner offset step and a second upper inner wall surface tapering upwardly from said inner offset step, said sidewall including a first lower outer wall surface tapering upwardly to an outwardly extending outer offset step and a second upper outer wall surface tapering upwardly from said outer offset step, said outer offset step being located below and spaced-apart from said inner offset step so as to define an annular thickened portion therebetween.
Claim 2
Dependent Claim
116 words
A step-wall nestable cup comprising: a base portion having an integrally formed sidewall extending upwardly therefrom to terminate at an upper peripheral edge so as to define a container, said sidewall including a first lower inner wall surface tapering upwardly to an outwardly extending inner offset step and a second upper inner wall surface tapering upwardly from said inner offset step, said sidewall including a first lower outer wall surface tapering upwardly to an outwardly extending outer offset step and a second upper outer wall surface tapering upwardly from said outer offset step, said outer offset step being located below and spaced-apart from said inner offset step so as to define an annular thickened portion therebetween.
Claim 3
Dependent Claim
33 words
In the step-wall container of claim 1 wherein an outwardly extending annular lip flange is provided along said upper peripheral edge, said lip flange defining an outer outwardly extending annular stack step therebelow.
Claim 4
Dependent Claim
28 words
In the step-wall container of claim 1 wherein the lower portion of said annular thickened portion defines an outer gripping step in the outer surface of said sidewall.
Claim 5
Dependent Claim
207 words
A step-wall nestable cup comprising: a base portion having an integrally formed sidewall extending upwardly therefrom to terminate at an upper peripheral edge so as to define a container, said sidewall including a first lower inner wall surface tapering upwardly to an outwardly extending first lower inner offset step and a second intermediate inner wall surface tapering upwardly from said first lower inner offset step to an outwardly extending second upper inner offset step and a third upper inner wall surface tapering upwardly from said second upper inner offset step, said sidewall including a first lower outer wall surface tapering upwardly to an outwardly extending first lower outer offset step and a second intermediate outer wall surface tapering upwardly from said first lower outer offset step to an outwardly extending second upper outer offset step and a third upper outer wall surface tapering upwardly from said second upper offset step, said first lower outer offset step being located below and spaced-apart from said first inner offset step so as to define a first lower annular thickened portion therebetween, said second upper outer offset step being located below and spaced-apart from said second upper inner offset step so as to define a second upper annular thickened portion therebetween.
Claim 6
Dependent Claim
207 words
A step-wall nestable cup comprising: a base portion having an integrally formed sidewall extending upwardly therefrom to terminate at an upper peripheral edge so as to define a container, said sidewall including a first lower inner wall surface tapering upwardly to an outwardly extending first lower inner offset step and a second intermediate inner wall surface tapering upwardly from said first lower inner offset step to an outwardly extending second upper inner offset step and a third upper inner wall surface tapering upwardly from said second upper inner offset step, said sidewall including a first lower outer wall surface tapering upwardly to an outwardly extending first lower outer offset step and a second intermediate outer wall surface tapering upwardly from said first lower outer offset step to an outwardly extending second upper outer offset step and a third upper outer wall surface tapering upwardly from said second upper offset step, said first lower outer offset step being located below and spaced-apart from said first inner offset step so as to define a first lower annular thickened portion therebetween, said second upper outer offset step being located below and spaced-apart from said second upper inner offset step so as to define a second upper annular thickened portion therebetween.
Claim 7
Dependent Claim
33 words
In the step-wall container of claim 4 wherein an outwardly extending annular lip flange is provided along said upper peripheral edge, said lip flange defining an outer outwardly extending annular stack step therebelow.
Claim 8
Dependent Claim
36 words
In the step-wall container of claim 4 wherein the lower portions of said first lower annular thickened portion and said second upper annular thickened portion define outer gripping steps in the outer surface of said sidewall.
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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) | 1986-12-12 | 1987-06-13 | 1987-12-13 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1990-12-12 | 1991-06-13 | 1991-12-13 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1994-12-12 | 1995-06-13 | 1995-12-13 | $7700.00 | Window Closed / Lapsed |