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Patent US3264172A successfully refreshed from Google Patents.
US3264172A
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US
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Bacteriostatic paper containing a guanidine salt and method of making the same
Assignee: Calgon Corp
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Filing: 1964-05-08
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Granted: 1966-08-02
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Expires: 1984-05-08
Abstract
No abstract record available.
Inventors
- 👤 Carl W Regutti
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-25 10:40
CPC Classifications
D; D21; D21H; D21H21/00; D21H21/14; D21H21/36
Claims Analysis
Total Claims: 1
Claim 1
Independent Claim
45 words
IN A METHOD OF MAKING BACTERIOSTATIC TISSUE PAPER THE STEP OF FORMING A TISSUE PAPER STOCK SUSPENSION HAVING THEREIN AN EFFECTIVE AMOUNT TO ABOUT 3% OF A GUANIDINE SALT ON THE DRY WEIGHT OF THE STOCK AND THEREAFTER FORMING A PAPER SHEET FROM SAID STOCK.
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) | 1969-08-01 | 1970-01-31 | 1970-08-02 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1973-08-01 | 1974-01-31 | 1974-08-02 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1977-08-01 | 1978-01-31 | 1978-08-02 | $7700.00 | Window Closed / Lapsed |