Patent US2452187A successfully refreshed from Google Patents.
US3791902A
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US
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Method for coating tampons with water-soluble film
Assignee: Kimberly Clark Corp
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Filing: 1971-11-12
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Granted: 1974-02-12
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Expires: 1991-11-12
Abstract
Abstract A method for coating the tip of a compressed absorbent tampon with a thin film of water-soluble plastic. The uncoated surface of the prefabricated film, such as polyvinyl alcohol, which is to be applied to the tampon is solvent-activated by humidifying the film or by the application thereto of a plasticizing fluid. While the film surface is still activated the film is molded onto the tampon tip by means of a heated tip-conforming die. The result is a thin film of unstressed polyvinyl alcohol intimately bonded to the tampon tip over the entire film-tampon interface by the autogenous adhesive power of the plasticized film.
Inventors
- 👤 D Hanke
- 👤 R Tews
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 15:31
CPC Classifications
A; A61; A61F; A61F13/00; A61F13/15; A61F13/20; A61F13/2051; A61F13/2082; A61F13/2085; B; B29; B29C; B29C65/00; B29C65/02; B29C65/18; B29C65/24; B29C65/30; B29C65/305; B29C65/48; B29C65/4895; B29C65/52; B29C65/522; B29C66/00; B29C66/01; B29C66/05; B29C66/10; B29C66/11; B29C66/112; B29C66/1122; B29C66/50; B29C66/51; B29C66/53; B29C66/532; B29C66/5326; B29C66/70; B29C66/71; B29C66/73; B29C66/737; B29C66/7379; B29C66/73793; B29C66/739; B29C66/7392; B29C66/74; B29C66/748; B29C66/7485; B29C66/80; B29C66/81; B29C66/814; B29C66/8141; B29C66/81431; B29C66/90; B29C66/91; B29C66/919; B29C66/81411; B29C66/81421; B29C66/81423; Y; Y10; Y10T; Y10T156/00; Y10T156/10; Y10T156/1002; Y10T156/1028
Claims Analysis
Total Claims: 6
Claim 1
Independent Claim
18 words
The method of claim 1 wherein said solvent-activation is accomplished by humidifying said film in a moisture-enriched atmosphere.
Claim 2
Dependent Claim
31 words
The method of claim 2 wherein said solvent-activation is accomplished by subjecting said film to a relative humidity of 80 percent at a temperature of about 72*F for about 2 hours.
Claim 3
Dependent Claim
24 words
The method of claim 1 wherein said solvent-activation is accomplished by applying to said one surface a thin coating of a fluid solvent therefor.
Claim 4
Dependent Claim
19 words
The method of claim 2 wherein one surface of said humidified film is coated with a fluid solvent therefor.
Claim 5
Dependent Claim
27 words
The method of claim 4 wherein said fluid solvent is selected from the group consisting of water; glycerine; propylene glycol; sorbitol; 1, 2-propanediol; and compatible mixtures thereof.
Claim 6
Dependent Claim
27 words
The method of claim 5 wherein said fluid solvent is selected from the group consisting of water; glycerine; propylene glycol; sorbitol; 1, 2-propanediol; and compatible mixtures thereof.
References Cited (Backward Citations)
US2831527A
Cited
US2867560A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1977-02-11 | 1977-08-13 | 1978-02-12 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1981-02-11 | 1981-08-13 | 1982-02-12 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1985-02-11 | 1985-08-13 | 1986-02-12 | $7700.00 | Window Closed / Lapsed |