Patent US3658613A successfully refreshed from Google Patents.
US3658613A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Absorbent products from wet cross-linked wood pulpboard and methods of making the same
Assignee: Personal Products Co
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Filing: 1970-06-17
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Granted: 1972-04-25
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Expires: 1990-06-17
Abstract
Abstract A method of making a fibrous, cellulosic absorbent product from sheets of pulpboard which comprises: wet cross-linking sheets of pulpboard; grinding the wet cross-linked sheets of pulpboard to form a pulp fluff therefrom having improved wet resilience, increased fluid absorption and retention capacity, and low knot content; and forming an absorbent product utilizing the pulp fluff as a fluid absorption and retention material therein.
Inventors
- 👤 Fred H Steiger
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-03 09:03
CPC Classifications
D; D21; D21H; D21H11/00; D21H11/16; A; A61; A61L; A61L15/00; A61L15/16; A61L15/22; A61L15/28; D04; D04H; D04H1/00; D04H1/40; D04H1/42; D04H1/425
Claims Analysis
Total Claims: 3
Claim 1
Independent Claim
20 words
A method of making a fibrous, cellulosic adsorbent product as defined in claim 1 wherein the pulpboard is wood pulpboard.
Claim 2
Independent Claim
72 words
A method of making a fibrous, cellulosic absorbent product from pulpboard which comprises: providing a pulpboard sheet wet cross-linking said pulpboard; washing the wet cross-linked pulpboard; drying the wet cross-linked pulpboard; grinding the wet cross-linked pulpboard to from pulp fluff therefrom having improved wet resilience, increased fluid absorption and retention capacity, and low knot content; and forming an absorbent product utilizing the pulp Fluff as a fluid absorption and retention material therein.
Claim 3
Independent Claim
89 words
A method of making a fibrous, cellulosic absorbent product from wood pulpboard which comprises: providing sheets of wood pulpboard wet cross-linking said sheets of wood pulpboard; neutralizing said wet cross-linked wood pulpboard; washing said wet cross-linked wood pulpboard; drying said wet cross-linked wood pulpboard; grinding said wet cross-linked wood pulpboard to form a wood pulp fluff therefrom having improved wet resilience, increased fluid absorption and retention capacity, and low knot content; and forming an absorbent product utilizing said wood pulp fluff as a fluid absorption and retention material therein.
References Cited (Backward Citations)
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1975-04-25 | 1975-10-25 | 1976-04-25 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1979-04-25 | 1979-10-25 | 1980-04-25 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1983-04-25 | 1983-10-25 | 1984-04-25 | $7700.00 | Window Closed / Lapsed |