US3706526A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Process for treating cellulosic material with formaldehyde and sulfur dioxide
Assignee: Cotton Inc
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Filing: 1971-12-06
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Granted: 1972-12-19
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Expires: 1991-12-06
Abstract
Abstract CELLULOSIC MATERIALS SUCH AS COTTON FABRICS ARE TREATED AT HIGH TEMPERATURES WITH FORMALDHYDE AND SULFUR DIOXIDE IN THE PRESENCE OF MOISTURE TO IMPROVE THEIR DIMENSIONAL STABILITY, CREASE RESISTANCE, AND SMOOTH DRYING CHARACTERISTICS.
Inventors
- 👤 Ronald Swidler
- 👤 Katherine W Wilson
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-30 12:33
CPC Classifications
D; D06; D06M; D06M13/00; D06M13/10; D06M13/12; D06M13/127; D06M11/00; D06M11/51; D06M11/54; Y; Y10; Y10S; Y10S8/00; Y10S8/04; Y10S8/09; Y10S8/10; Y10S8/21
Claims Analysis
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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) | 1975-12-19 | 1976-06-19 | 1976-12-19 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1979-12-19 | 1980-06-19 | 1980-12-19 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1983-12-19 | 1984-06-19 | 1984-12-19 | $7700.00 | Window Closed / Lapsed |