US4513876A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Container lid with an opener device
Assignee: Robert Bosch GmbH
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Filing: 1984-06-13
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Granted: 1985-04-30
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Expires: 2004-06-13
Abstract
Abstract A lid for a packaging container including an easy opening tear-open part which is surrounded by a weakened line. The lid is molded from a compound material, which has an outer carrier layer of plastic, a middle barrier layer of metal foil and an inner heat-sealing layer of a thermoplastic material. In order to facilitate the initial tear of the tear-open part, the middle barrier layer is also thinned or ruptured at least in the starting segment in a location coinciding with the weakening line in the carrier layer.
Inventors
- 👤 Norbert Buchner
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 19:25
CPC Classifications
B; B65; B65D; B65D5/00; B65D5/42; B65D5/70; B65D5/706; B65D17/00; B65D17/28; B65D17/401; B65D17/4012
Claims Analysis
Total Claims: 20
Claim 1
Independent Claim
88 words
A container lid comprising an outer, relatively thick carrier layer of a thermoplastic material, an inner sealing layer made of a thermoplastic material and adapted to be heat sealed to a container body, a middle barrier layer preferably comprising a thin metal foil, a weakened line stamped into the carrier layer and surrounding a tear-open part, wherein said barrier layer is weakened along a line coinciding in location with said weakened line in the carrier layer, at least in the area in which the tear is iniatially started.
Claim 2
Dependent Claim
88 words
A container lid comprising an outer, relatively thick carrier layer of a thermoplastic material, an inner sealing layer made of a thermoplastic material and adapted to be heat sealed to a container body, a middle barrier layer preferably comprising a thin metal foil, a weakened line stamped into the carrier layer and surrounding a tear-open part, wherein said barrier layer is weakened along a line coinciding in location with said weakened line in the carrier layer, at least in the area in which the tear is iniatially started.
Claim 3
Dependent Claim
28 words
A container lid as defined by claim 1, in which the barrier layer is thinned in the area of the weakening line by means of stretching or pressing.
Claim 4
Dependent Claim
22 words
A container lid as defined by claim 1, in which the barrier layer is ruptured in the area of the weakening line.
Claim 5
Dependent Claim
42 words
A container lid as defined by claim 1, in which a grip tab connected with the tear-open part covers the tear-open part and is releasably sealed by means of a sealing seam with the portion of a lid outside the tear-open part.
Claim 6
Dependent Claim
42 words
A container lid as defined by claim 2, in which a grip tab connected with the tear-open part covers the tear-open part and is releasably sealed by means of a sealing seam with the portion of a lid outside the tear-open part.
Claim 7
Dependent Claim
42 words
A container lid as defined by claim 3, in which a grip tab connected with the tear-open part covers the tear-open part and is releasably sealed by means of a sealing seam with the portion of a lid outside the tear-open part.
Claim 8
Dependent Claim
32 words
A container lid as defined by claim 4, in which the strength of the sealing seam is less than the strength of the connection between the grip tab and the tear-open part.
Claim 9
Dependent Claim
32 words
A container lid as defined by claim 5, in which the strength of the sealing seam is less than the strength of the connection between the grip tab and the tear-open part.
Claim 10
Dependent Claim
32 words
A container lid as defined by claim 6, in which the strength of the sealing seam is less than the strength of the connection between the grip tab and the tear-open part.
Claim 11
Dependent Claim
28 words
A container lid as defined by claim 1, in which the tear-open part is offset relative to the remaining lid portion crosswise to the plane of the lid.
Claim 12
Dependent Claim
28 words
A container lid as defined by claim 2, in which the tear-open part is offset relative to the remaining lid portion crosswise to the plane of the lid.
Claim 13
Dependent Claim
28 words
A container lid as defined by claim 3, in which the tear-open part is offset relative to the remaining lid portion crosswise to the plane of the lid.
Claim 14
Independent Claim
87 words
A method of forming a tear-open part in a three layer lid of a container comprising an outer layer, a barrier layer and an inner layer, which comprises: forming a notch in the surface of the outer layer of said lid which notch forms an outline of an opening to be made in said lid, weakening said barrier layer along a line coinciding with said notch formed in said outer layer, and applying a grip top to said outer layer along said notch in said outer layer.
Claim 15
Independent Claim
87 words
A method of forming a tear-open part in a three layer lid of a container comprising an outer layer, a barrier layer and an inner layer, which comprises: forming a notch in the surface of the outer layer of said lid which notch forms an outline of an opening to be made in said lid, weakening said barrier layer along a line coinciding with said notch formed in said outer layer, and applying a grip top to said outer layer along said notch in said outer layer.
Claim 16
Dependent Claim
29 words
A method as set forth in claim 13 which includes: heating said outer layer to melt a portion of said outer layer in order to form said notch therein.
Claim 17
Dependent Claim
34 words
A method as set forth in claim 13 which includes: stretching said barrier layer in the area coinciding with said notch in said outer layer to produce a thinned area coinciding with said notch.
Claim 18
Dependent Claim
34 words
A method as set forth in claim 14 which includes: stretching said barrier layer in the area coinciding with said notch in said outer layer to produce a thinned area coinciding with said notch.
Claim 19
Dependent Claim
26 words
A method as set forth in claim 13 which includes: rupturing said barrier layer in the area coinciding with said notch formed in said outer layer.
Claim 20
Dependent Claim
26 words
A method as set forth in claim 14 which includes: rupturing said barrier layer in the area coinciding with said notch formed in said outer layer.
References Cited (Backward Citations)
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1988-04-29 | 1988-10-29 | 1989-04-30 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1992-04-29 | 1992-10-29 | 1993-04-30 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1996-04-29 | 1996-10-29 | 1997-04-30 | $7700.00 | Window Closed / Lapsed |