US2665734A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Protection of cellulose fiber against heat aging and tire casing containing such fiber
Assignee: Uniroyal Inc
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Filing: 1951-02-27
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Granted: 1954-01-12
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Expires: 1971-02-27
Abstract
No abstract record available.
Inventors
- 👤 Howard M Buckwalter
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-29 23:38
CPC Classifications
B; B29; B29D; B29D30/00; B29D30/06; B29D30/38; B29D30/40; Y; Y10; Y10S; Y10S156/00; Y10S156/91; Y10T; Y10T428/00; Y10T428/29; Y10T428/2913; Y10T428/2933; Y10T428/2964; Y10T428/2965; Y10T428/31504; Y10T428/31826; Y10T428/31841
Claims Analysis
Total Claims: 1
Claim 1
Independent Claim
105 words
THE METHOD OF IMPROVING THE RESISTANCE OF CELLULOSE FIBERS TO THE DETERIORATING EFFECTS OF HEAT AGING WHICH COMPRISES INCORPORATING CYANAMIDE IN THE CELLULOSE FIBER IN AMOUNT OF FROM 0.1 TO 10.0% BY WEIGHT, SUBJECTING THE CYANAMIDE TO A TEMPERATURE SUFFICIENTLY ELEVATED TO CONVERT IT TO DICYANDIAMIDE AND PRESERVING THE DICYANDIAMIDE AS SUCH IN THE FIBERS WHEREBY THE SAID DICYANDIAMIDE IS AVAILABLE AS SUCH DURING SUBSEQUENT EXPOSURE OF THE THUS TREATED FIBERS TO HEAT AGING AND THE FIBERS ARE THEREBY SUBSTANTIALLY PRESERVED AGAINST PERMANENT, IRREVERSIBLE LOSS OF THEIR ORIGINAL STRENGTH LEVEL AFTER EXPOSURE TO TEMPERATURES ABOVE 125* C. BUT BELOW THE IGNITION TEMPERATURE OF THE FIBERS.
References Cited (Backward Citations)
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USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1957-01-11 | 1957-07-13 | 1958-01-12 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1961-01-11 | 1961-07-13 | 1962-01-12 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1965-01-11 | 1965-07-13 | 1966-01-12 | $7700.00 | Window Closed / Lapsed |