Patent US2536285A successfully refreshed from Google Patents.
US2536285A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Process of making high wet strength paper
Assignee: Champion Paper and Fibre Co
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Filing: 1946-07-25
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Granted: 1951-01-02
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Expires: 1966-07-25
Abstract
No abstract record available.
Inventors
- 👤 Herman C N Heckel
- 👤 Arthur C Salisbury
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-29 12:19
CPC Classifications
D; D21; D21H; D21H17/00; D21H17/63
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
48 words
PROCESS OF IMPARTING WET STRENGTH PROPERTIES TO PAPER WHICH COMPRISES EXPOSING A WEB OR SHEET OF PAPER TO NITROGEN PEROXIDE AND THEN TREATING THE PAPER WITH AN EXCESS OF WATER TO PRODUCE PARTIAL GELATINIZATION OF THE SURFACE OF THE FIBERS AND LIMITING THE TIME OF EXPOSURE OF THE
Claim 2
Dependent Claim
48 words
PROCESS OF IMPARTING WET STRENGTH PROPERTIES TO PAPER WHICH COMPRISES EXPOSING A WEB OR SHEET OF PAPER TO NITROGEN PEROXIDE AND THEN TREATING THE PAPER WITH AN EXCESS OF WATER TO PRODUCE PARTIAL GELATINIZATION OF THE SURFACE OF THE FIBERS AND LIMITING THE TIME OF EXPOSURE OF THE
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USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1954-01-01 | 1954-07-03 | 1955-01-02 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1958-01-01 | 1958-07-03 | 1959-01-02 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1962-01-01 | 1962-07-03 | 1963-01-02 | $7700.00 | Window Closed / Lapsed |