US4084591A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Water dispersible absorber for blood and the like
Assignee: Eisai Co Ltd
•
Filing: 1976-02-11
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Granted: 1978-04-18
•
Expires: 1996-02-11
Abstract
Abstract Novel absorber for the blood and the like, particularly a tampon for menses, which is made of the filaments of a lower alkyl or a lower hydroxyalkyl substituted cellulose ether. The absorber is insoluble in the blood and the like when it is used, but it is dispersible and soluble in water when it is thrown away.
Inventors
- 👤 Toshio Takebe
- 👤 Takashi Yamazaki
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-04 22:33
CPC Classifications
A; A61; A61F; A61F13/00; A61F13/15; A61F13/20; A61F13/2051; A61L; A61L15/00; A61L15/16; A61L15/22; A61L15/28; A61F13/15203; A61F13/15211; A61F13/2002; A61F13/202; A61F2013/15235; Y; Y10; Y10S; Y10S604/00; Y10S604/904
Claims Analysis
Total Claims: 9
Claim 1
Independent Claim
71 words
A soft vaginal tampon for the absorption of menstrual blood, which comprises a filamentary material of a one to three carbon alkyl or a one to three carbon hydroxyalkyl substituted cellulose ether having thermogelation properties in water which material is substantially water soluble at room temperature yet is substantially insoluble in menstural blood at body temperature, and which maintains its softness without immediately dissolving after absorbing menstural blood in the vagina.
Claim 2
Dependent Claim
71 words
A soft vaginal tampon for the absorption of menstrual blood, which comprises a filamentary material of a one to three carbon alkyl or a one to three carbon hydroxyalkyl substituted cellulose ether having thermogelation properties in water which material is substantially water soluble at room temperature yet is substantially insoluble in menstural blood at body temperature, and which maintains its softness without immediately dissolving after absorbing menstural blood in the vagina.
Claim 3
Dependent Claim
22 words
The tampon of claim 1, wherein the filamentary material is used together with a filamentary material of absorbent cotton or staple fibre.
Claim 4
Dependent Claim
33 words
The tampon of claim 1, wherein the lower alkyl or a lower hydroxyalkyl substituted cellulose ether is selected from the group consisting of methyl cellulose, ethylcellulose, hydroxyethyl cellulose, hydroxypropyl cellulose, and hydroxypropylmethyl cellulose.
Claim 5
Dependent Claim
15 words
The tampon of claim 1, wherein the lower alkyl subsituted cellulose ether is methyl cellulose.
Claim 6
Dependent Claim
15 words
The tampon of claim 1, wherein the lower alkyl substituted cellulose ether is ethyl cellulose.
Claim 7
Dependent Claim
15 words
The tampon of claim 1, wherein the lower hydroxyalkyl substituted cellulose ether is hydroxyethyl cellulose.
Claim 8
Dependent Claim
15 words
The tampon of claim 1, wherein the lower hydroxyalkyl substituted cellulose ether is hydroxypropyl cellulose.
Claim 9
Dependent Claim
15 words
The tampon of claim 1, wherein the lower hydroxyalkyl substituted cellulose ether is hydroxypropylmethyl cellulose.
References Cited (Backward Citations)
US1505043A
Cited
US3029817A
Cited
US3251824A
Cited
US3278520A
Cited
US3388082A
Cited
US3901236A
Cited
US3954104A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1981-04-17 | 1981-10-17 | 1982-04-18 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1985-04-17 | 1985-10-17 | 1986-04-18 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1989-04-17 | 1989-10-17 | 1990-04-18 | $7700.00 | Window Closed / Lapsed |