US3619355A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Method for decreasing aging of paper with sulfites and/or bisulfites and product
Assignee: Georgia-Pacific LLC
•
Filing: 1967-09-07
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Granted: 1971-11-09
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Expires: 1987-09-07
Abstract
Abstract A dried paper web is impregnated with a soluble sulfite and/or bisulfite salt, such as sodium sulfite or bisulfite which salt may be incorporated in an aqueous starch, or starch clay, surface-sizing composition to decrease the aging of the paper.
Inventors
- 👤 Richard A Silberman
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-02 12:27
CPC Classifications
D; D21; D21H; D21H17/00; D21H17/63; D21H17/66
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
13 words
The process of claim 1 wherein the sulfite salt is a sodium salt.
Claim 2
Dependent Claim
52 words
As an article of manufacture, a dry paper web having a surface impregnated with starch and a sulfite salt selected from the group consisting of sodium, potassium, and ammonium sulfites and bisulfites, and mixtures thereof, in an amount of from about 5 to about 20 pounds of sulfite per ton of paper.
References Cited (Backward Citations)
US1857948A
Cited
US2242087A
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 |