Patent US4187798A successfully refreshed from Google Patents.
US4187798A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Method of detecting defective portion of sealing
Assignee: Nagatanien Honpo Co Ltd
•
Filing: 1978-04-17
•
Granted: 1980-02-12
•
Expires: 1998-04-17
Abstract
Abstract A method of detecting the defective portion of sealing comprising injecting into a moisture-tight container or package having a sealed portion a detection liquor consisting essentially of a colored liquid organic compound small in surface tension and high in permeability into small clearances. The defective portion of sealing is readily detected by exudation of the detection liquor outside the moisture-tight container.
Inventors
- 👤 Tetsuya Yoshimura
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-05 11:34
CPC Classifications
G; G01; G01M; G01M3/00; G01M3/02; G01M3/04; G01M3/20; G01M3/22; G01M3/226
Claims Analysis
Total Claims: 6
Claim 1
Independent Claim
142 words
A method of detecting a defective sealed portion of a sealed container, said method comprising the steps of: (a) injecting into a sealed container a colored detection liquor consisting essentially of a coloring material giving color to said liquor and a liquid organic compound, said liquor having a surface tension lower than that of water and a permeability into small clearances greater than that of water such that the surface tension and permeability properties of said liquor permit said liquor to exude into a defective sealed portion of the sealed container; (b) resealing the container where the colored detection liquor was injected; and (c) inspecting said container for the presence of colored detection liquor, whereby a defective sealed portion of said sealed container may be detected by the visible presence of colored detection liquor in the area of a defective sealed portion.
Claim 2
Independent Claim
142 words
A method of detecting a defective sealed portion of a sealed container, said method comprising the steps of: (a) injecting into a sealed container a colored detection liquor consisting essentially of a coloring material giving color to said liquor and a liquid organic compound, said liquor having a surface tension lower than that of water and a permeability into small clearances greater than that of water such that the surface tension and permeability properties of said liquor permit said liquor to exude into a defective sealed portion of the sealed container; (b) resealing the container where the colored detection liquor was injected; and (c) inspecting said container for the presence of colored detection liquor, whereby a defective sealed portion of said sealed container may be detected by the visible presence of colored detection liquor in the area of a defective sealed portion.
Claim 3
Dependent Claim
35 words
The method according to claim 1, wherein the organic compound has a surface tension of about 20 to 30 dyne/cm and a vapor pressure about 5 to 10 times as high as that of water.
Claim 4
Dependent Claim
14 words
The method according to claim 2, wherein methanol is used as the organic compound.
Claim 5
Dependent Claim
37 words
The method according to claim 1, wherein the moisture-tight container is the one formed by sealing the periphery of two overlapped sheets of any of metal foil, synthetic resin and laminate of metal foil, and synthetic resin.
Claim 6
Dependent Claim
24 words
The method according to claim 1, wherein the detection liquor is an aqueous solution containing at least 70% by volume of methanol or acetone.
References Cited (Backward Citations)
US1478445A
Cited
US1915965A
Cited
US2318307A
Cited
US3091114A
Cited
US3093242A
Cited
US3102082A
Cited
US3555884A
Cited
DE1925248A1
Cited
US3744210A
Cited
US4125822A
Cited
US3899295A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1983-02-11 | 1983-08-13 | 1984-02-12 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1987-02-11 | 1987-08-13 | 1988-02-12 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1991-02-11 | 1991-08-13 | 1992-02-12 | $7700.00 | Window Closed / Lapsed |