US3676055A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Preserving cellulosic materials through treatment with alkylene oxides
Assignee: Individual
•
Filing: 1970-08-31
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Granted: 1972-07-11
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Expires: 1990-08-31
Abstract
Abstract AN IMPROVEMENT IN NONAQUEOUS PROCESSES FOR DACIDIFICATION AND PERSERVATION OF CELLULOSIC MATERIALS IS DISCLOSED, COMPRISING REACTING THE DACIDIFIED CELLULOSIC MATERIAL WITH ALKYLENE OXIDE SUCH AS ETHYLENE OXIDE. PARTICULARLY EFFECTIVE IS CONTACTING CELLULOSIC MATERIAL, SUCH AS BOOKS, WHICH ARE DEACIDIFIED BY A NONAQUEOUS DEACIDIFICATION PROCESS, WITH ETHYLENE OXIDE FOR 15 MINUTES OR LESS AT AMBIENT TEMPERATURE AND ATMOSPHERIC PRESSURE, AND EQUIVALENT REACTION CONDITIONS AT OTHER PRESSURES AND TEMPERATURES.
Inventors
- 👤 Richard Daniel Smith
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-31 15:22
CPC Classifications
B; B41; B41M; B41M7/00; B41M7/0063; D; D06; D06M; D06M13/00; D06M13/10; D06M13/11; D21; D21H; D21H25/00; D21H25/18; Y; Y10; Y10S; Y10S8/00; Y10S8/08
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
No citation records indexed.
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1975-07-11 | 1976-01-10 | 1976-07-11 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1979-07-11 | 1980-01-10 | 1980-07-11 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1983-07-11 | 1984-01-10 | 1984-07-11 | $7700.00 | Window Closed / Lapsed |