Patent US4436213A successfully refreshed from Google Patents.
US4436213A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Container having tamper evident seal and imaged polymer film useful as such a seal
Assignee: Illinois Tool Works Inc
•
Filing: 1982-11-05
•
Granted: 1984-03-13
•
Expires: 2002-11-05
Abstract
Abstract There is provided a tamper evident container seal comprising a normally transparent polymer film which can be rendered translucent by stretching and transparent by relaxing. There is also provided a polymer film useful as a seal of the same type of film which bears an image which is not readily visible when the film is relaxed, but becomes readily visible when the film is stretched.
Inventors
- 👤 Fred R. Paul, Jr.
- 👤 James S. Mrozinski
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-02 05:20
CPC Classifications
B; B65; B65D; B65D55/00; B65D55/02; B65D55/06; B65D55/066; Y; Y10; Y10S; Y10S206/00; Y10S206/807
Claims Analysis
Total Claims: 13
Claim 1
Independent Claim
38 words
A container having walls defining a cavity and an opening into said cavity covered by a tamper evident seal comprising a normally transparent polymer film which can be repeatedly rendered temporarily translucent by stretching and transparent by relaxing.
Claim 2
Dependent Claim
38 words
A container having walls defining a cavity and an opening into said cavity covered by a tamper evident seal comprising a normally transparent polymer film which can be repeatedly rendered temporarily translucent by stretching and transparent by relaxing.
Claim 3
Dependent Claim
77 words
The container of claim 1 wherein said normally transparent film comprises a quenched sheet comprising 40 to 85 parts by weight of a thermoplastic polymer having at least 5 percent crystallinity and 15 to 60 parts by weight of a compound in which said polymer will dissolve or form a solution at the melting temperature of said polymer but from which said polymer will separate on cooling to a temperature below the melting temperature of said polymer.
Claim 4
Dependent Claim
15 words
The container of claim 2 wherein said polymer is a polyolefin or a polyolefin copolymer.
Claim 5
Dependent Claim
16 words
The container of claim 2 wherein said polymer is polypropylene and said compound is mineral oil.
Claim 6
Dependent Claim
19 words
The container of claim 2 wherein said polymer is polyethylene and said compound is mineral oil or mineral spirits.
Claim 7
Dependent Claim
17 words
The container of claim 2 wherein said polymer is polyethylene/polypropylene copolymer and said compound is mineral oil.
Claim 8
Dependent Claim
17 words
The container of claim 2 wherein said polymer is polyethylene terephthalate and said compound is diethyl phthalate.
Claim 9
Dependent Claim
40 words
The container of claim 1 wherein said normally transparent film comprises a quenched sheet comprising 40 to 85 parts by weight of a polyethylene having at least 5 percent crystallinity and 15 to 60 parts by weight of mineral oil.
Claim 10
Dependent Claim
32 words
The container of claim 1 wherein said normally transparent film bears an image which is not readily visible when said film is relaxed but becomes readily visible when said film is stretched.
Claim 11
Dependent Claim
20 words
The container of claim 1 wherein said walls define a bottle and said opening is the mouth of said bottle.
Claim 12
Dependent Claim
40 words
A normally transparent polymer film which can be repeatedly rendered temporarily translucent by stretching and transparent by relaxing bearing an image which is not readily visible when said film is relaxed but becomes readily visible when said film is stretched.
Claim 13
Dependent Claim
40 words
A normally transparent polymer film which can be repeatedly rendered temporarily translucent by stretching and transparent by relaxing bearing an image which is not readily visible when said film is relaxed but becomes readily visible when said film is stretched.
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) | 1987-03-13 | 1987-09-12 | 1988-03-13 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1991-03-13 | 1991-09-12 | 1992-03-13 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1995-03-13 | 1995-09-12 | 1996-03-13 | $7700.00 | Window Closed / Lapsed |