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US3640735A Expired / Lapsed US ⏱️ 0.0 years remaining

Fibrous reinforced polyvinyl alcohol casings

Assignee: Continental Group Inc
•
Filing: 1968-10-18
•
Granted: 1972-02-08
•
Expires: 1988-10-18
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Abstract

Abstract A novel fibrous casing for packaging sausages and other meat and food products comprises a saturating tissue, preferably a long fiber hemp paper, coated or impregnated with an insolublized polyvinyl alcohol. The casing is preferably prepared by coating and impregnating a saturating tissue with an aqueous solution of polyvinyl alcohol which is then insolublized, preferably by cross-linking with a suitable cross-linking agent, viz formaldehyde, etc. The saturating tissue may be coated and impregnated with the polyvinyl alcohol solution and immediately formed into a tubular casing or may be coated and impregnated in sheet form and dried and subsequently slit to size and formed into a tubular casing in a separate seaming operation. Casings are preferably formed using long fiber hemp paper as the saturating tissue and using polyvinyl alcohol having a D.S. of OH groups of at least 95 percent.

Inventors

  • 👤 Seymour Oppenheimer
  • 👤 Albin F Turbak

Bibliographic Details

Application Number —
Jurisdiction US
Data Source google_patents
Last Synchronized 2026-10-26 19:27
CPC Classifications
B; B29; B29C; B29C48/00; B29C48/25; B29C48/88; B29C48/919; B29C48/03; B29C48/09; B29C48/10

Claims Analysis

Total Claims: 12
Claim 1
Independent Claim 24 words
A meat casing as defined in claim 1 in which the casing is formed into a tube at the time of saturation and coating.
Claim 2
Dependent Claim 31 words
A meat casing as defined in claim 1 in which the casing is saturated and coated as flat stock, dried, and subsequently formed into a tube with an adhesively bonded seam.
Claim 3
Dependent Claim 29 words
A meat casing as defined in claim 3 in which the adhesive used to form said seam is a polyvinyl alcohol or an adhesive chemically reactive with polyvinyl alcohol.
Claim 4
Independent Claim 89 words
A method of preparing a synthetic meat casing comprising, a. saturating and coating a long fiber saturating tissue with an aqueous solution of a polyvinyl alcohol having a D.S. of at least 80 percent with respect to OH groups, b. drying and curing said saturated and coated tissue to produce a fiber reinforced polyvinyl alcohol film, c. forming said coated and saturated tissue longitudinally into a tube and forming a seam therein, and d. cross-linking the polyvinyl alcohol on said tissue to yield a reinforced film of low-water sensitivity.
Claim 5
Dependent Claim 42 words
A method as defined in claim 5 in which said polyvinyl alcohol is cross-linked by reaction with formaldehyde, glyoxal, glutaraldehyde, a diisocyanate, a diisothiocyanate, a poly epoxide, a polyamide epichlorohydrin, a polymethylol substituted water-soluble resin, a diacyl halide, or a polymeric ketene.
Claim 6
Dependent Claim 21 words
A method as defined in claim 5 in which a cross-linking agent is added in admixture with said polyvinyl alcohol solution.
Claim 7
Dependent Claim 23 words
A method as defined in claim 5 in which said casing is treated with a cross-linking agent prior to, during, or after drying.
Claim 8
Dependent Claim 19 words
A method as defined in claim 5 in which said casing is formed into a tube prior to drying.
Claim 9
Dependent Claim 20 words
A method as defined in claim 5 in which said polyvinyl alcohol has a D.S. of at least 98 percent.
Claim 10
Dependent Claim 19 words
A meThod as defined in claim 10 in which said casing is impregnated with a plasticizer for polyvinyl alcohol.
Claim 11
Dependent Claim 29 words
A method as defined in claim 5 in which said coated and saturated tissue is dried and subsequently formed into a tube having a longitudinal seam secured by adhesive.
Claim 12
Dependent Claim 23 words
A method as defined in claim 12 in which said adhesive is a polyvinyl alcohol or an adhesive chemically reactive with polyvinyl alcohol.

References Cited (Backward Citations)

GB386161A Cited
GB471724A Cited
US2210436A Cited
US2169250A Cited
US2590221A Cited
US2697664A Cited
US2952550A Cited
US2993825A Cited
US3329509A Cited
US3061458A Cited
US3505264A Cited
US3320200A Cited
US3516960A Cited

USPTO Annuity & Maintenance Windows

Annuity Stage Window Opens Payment Deadline Surcharge Period Until Estimated Fee Status
3.5 Years (Year 4) 1975-02-07 1975-08-09 1976-02-08 $2000.00 Window Closed / Lapsed
7.5 Years (Year 8) 1979-02-07 1979-08-09 1980-02-08 $3760.00 Window Closed / Lapsed
11.5 Years (Year 12) 1983-02-07 1983-08-09 1984-02-08 $7700.00 Window Closed / Lapsed

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