Patent US3618607A successfully refreshed from Google Patents.
US3618607A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Saline fluid absorption and retention tampons and methods of making the same
Assignee: Johnson and Johnson
•
Filing: 1970-02-17
•
Granted: 1971-11-09
•
Expires: 1990-02-17
Abstract
Abstract An improved saline fluid absorption and retention tampon having a density of from about 0.4 gram per cubic centimeter to about 0.8 gram per cubic centimeter and comprising water-insoluble, wet cross-linked carboxyalkyl cellulose having average degrees of substitution of from about 0.4 to about 1.3, and methods of making the same.
Inventors
- 👤 Myron B Ells
- 👤 Fred H Steiger
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-01 07:51
CPC Classifications
A; A61; A61F; A61F13/00; A61F13/15; A61F13/20; A61F13/2051; Y; Y10; Y10S; Y10S604/00; Y10S604/904
Claims Analysis
Total Claims: 6
Claim 1
Independent Claim
24 words
An improved saline fluid absorption and retention tampon as defined in claim 1, wherein the water-insoluble, wet cross-linked carboxyalkyl cellulosic material is carboxymethyl cellulose.
Claim 2
Dependent Claim
24 words
An improved saline fluid absorption and retention tampon as defined in claim 1, wherein the water-insoluble, wet cross-linked carboxyalkyl cellulosic material is carboxyethyl cellulose.
Claim 3
Independent Claim
87 words
A method of making an improved saline fluid absorption and retention tampon which comprises: wet cross-linking cellulosic materials to increase the compressing properties thereof; carboxyalkylating the wet cross-linked cellulosic materials to incRease the saline fluid absorption and retention properties thereof; incorporating the wet cross-linked, carboxyalkylated cellulosic materials in a tampon; and compressing said wet cross-linked carboxyalkylated cellulosic materials to a density range of from about 0.4 gram per cubic centimeter to about 0.8 gram per cubic centimeter to provide improved saline fluid absorption and retention properties therein.
Claim 4
Dependent Claim
24 words
A method of making an improved saline fluid absorption and retention tampon as defined in claim 4, wherein the carboxyalkylating step is a carboxymethylation.
Claim 5
Dependent Claim
44 words
A method of making an improved saline fluid absorptive and retention tampon as defined in claim 5, wherein the carboxymethylation is carried out to a degree of substitution of from about 0.4 to about 1.3 carboxymethyl radicals per anhydroglucose unit in the cellulosic materials.
Claim 6
Dependent Claim
24 words
A method of making an improved saline fluid absorption and retention tampon as defined in claim 4, wherein the carboxyalkylating step is a carboxyethylation.
References Cited (Backward Citations)
US2845070A
Cited
US3055369A
Cited
US2971815A
Cited
US3317513A
Cited
US3525735A
Cited
US3224926A
Cited
US3423167A
Cited
US3542028A
Cited
US3563241A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1974-11-08 | 1975-05-10 | 1975-11-09 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1978-11-08 | 1979-05-10 | 1979-11-09 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1982-11-08 | 1983-05-10 | 1983-11-09 | $7700.00 | Window Closed / Lapsed |