US3661695A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Two water soluble films connected to each side of a water impervious synthetic membrane
Assignee: MD Industries Inc
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Filing: 1970-05-19
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Granted: 1972-05-09
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Expires: 1990-05-19
Abstract
Abstract Two sheets of water soluble film are cemented together with a waterproof adhesive which forms a thin membrane. If either side of the laminated film is exposed to water, that side is dissolved quickly, but the membrane prevents the other side from becoming wet. The other water soluble side provides a mechanical strength, adequate to support the weight of water or other substances resting on the membrane. When the laminate is discarded into a water substance, the other side dissolves leaving only the membrane which is too weak to survive as a mechanical structure.
Inventors
- 👤 Julius F T Berliner
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 15:55
CPC Classifications
B; B32; B32B; B32B27/00; B65; B65D; B65D65/00; B65D65/38; B65D65/46; Y; Y10; Y10S; Y10S428/00; Y10S428/913; Y10T; Y10T428/00; Y10T428/24; Y10T428/24942; Y10T428/2495; Y10T428/24967
Claims Analysis
Total Claims: 13
Claim 1
Independent Claim
22 words
The material of claim 1 wherein said membrane is formed by a pressure sensitive adhesive for cementing said water soluble films together.
Claim 2
Dependent Claim
26 words
The material of claim 1 wherein said films and membrane are selected from among classes of materials which are non-toxic, non- allergenic, and non-irritating to humans.
Claim 3
Dependent Claim
23 words
The material of claim 1 wherein said membrane is a water dispersible tissue of monofilament cellulose fiber impregnated with a pressure sensitive adhesive.
Claim 4
Dependent Claim
65 words
A flexible water soluble film container for water and materials containing water said film comprising water impervious means for indefinitely resisting passage of said water from either side through said film, and means for dissolving all of said container except said water impervious means when said container is immersed in water, said water impervious means being readily macerated in water after said container is dissolved.
Claim 5
Dependent Claim
15 words
The film of claim 5 and means for causing said film to dissolve on disposal.
Claim 6
Dependent Claim
24 words
The film of claim 5 wherein sAid film is a laminate of two water soluble layers cemented to and separated by a water-impervious membrane.
Claim 7
Dependent Claim
14 words
The film of claim 7 wherein said membrane is a pressure sensitive adhesive material.
Claim 8
Dependent Claim
22 words
The film of claim 8 wherein said adhesive material cements said two water soluble layers together, free of wrinkles and air bubbles.
Claim 9
Dependent Claim
35 words
The film of claim 9 wherein each of said water soluble layers is in the range of 1/2 to 2 mils thick and said membrane is in the range of 1/10 to 1 mil thick.
Claim 10
Dependent Claim
24 words
The film of claim 7 wherein said membrane is a tissue paper including a monofilament fiber film impregnated with a pressure sensitive adhesive material.
Claim 11
Dependent Claim
38 words
An integral laminated material comprising two sheets of a water soluble film forming polymer separated by a water impervious membrane, said membrane being too weak a mechanical structure to survive intact after said water soluble films have dissolved.
Claim 12
Dependent Claim
31 words
The laminated material of claim 12 wherein said film forming polymer is taken from a class represented by compounds such as methyl cellulose, cellulose propionate, hydroxyethyl cellulose, and sodium carboxymethyl cellulose.
Claim 13
Dependent Claim
25 words
The laminated material of claim 12 wherein said film forming polymer is taken from a class represented by polyvinyl alcohol and partially hydrolized polyvinyl acetate.
References Cited (Backward Citations)
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US2734012A
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Cited
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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) | 1975-05-09 | 1975-11-08 | 1976-05-09 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1979-05-09 | 1979-11-08 | 1980-05-09 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1983-05-09 | 1983-11-08 | 1984-05-09 | $7700.00 | Window Closed / Lapsed |