US3224902A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Thermally stabilized cellulose materials
Assignee: McGraw Edison Co
•
Filing: 1961-09-07
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Granted: 1965-12-21
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Expires: 1981-09-07
Abstract
No abstract record available.
Inventors
- 👤 Fred S Sadler
- 👤 James D Wadeson
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-28 20:02
CPC Classifications
D; D21; D21H; D21H17/00; D21H17/03; D21H17/05; D21H17/07; D21H17/20; D21H17/21; D21H17/22
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
43 words
A CELLULOSE MATERIAL HAVING IMPROVED THERMAL STABILITY FOR USE AT ELEVATED TEMPERATURES, COMPRISING A BASE CONSISTING OF CELLULOSE FIBERS IMPREGNATED SOLELY WITH DIMETHYL FORMAMIDE IN AN AMOUNT TO PROVIDE A NITROGEN CONTENT IN THE RANGE OF 0.2 TO 2.0% IN THE DRY BASE.
Claim 2
Dependent Claim
43 words
A CELLULOSE MATERIAL HAVING IMPROVED THERMAL STABILITY FOR USE AT ELEVATED TEMPERATURES, COMPRISING A BASE CONSISTING OF CELLULOSE FIBERS IMPREGNATED SOLELY WITH DIMETHYL FORMAMIDE IN AN AMOUNT TO PROVIDE A NITROGEN CONTENT IN THE RANGE OF 0.2 TO 2.0% IN THE DRY BASE.
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) | 1968-12-20 | 1969-06-21 | 1969-12-21 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1972-12-20 | 1973-06-21 | 1973-12-21 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1976-12-20 | 1977-06-21 | 1977-12-21 | $7700.00 | Window Closed / Lapsed |