US2729541A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Preparation of metal cyanates
Assignee: Ethyl Corp
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Filing: 1953-03-24
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Granted: 1956-01-03
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Expires: 1973-03-24
Abstract
No abstract record available.
Inventors
- 👤 Pree David O De
- 👤 Oldenburg Edgar Bradley
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-01 20:22
CPC Classifications
C; C01; C01C; C01C3/00; C01C3/14
Claims Analysis
Total Claims: 1
Claim 1
Independent Claim
82 words
A PROCESS FOR THE MANUFACTURE OF METAL CYANATES COMPRISING REACTING A DISPERSION OF A METALLIC ELEMENT IN AN INERT ORGANIC LIQUID HAVING A BOILING POINT BETWEEN ABOUT 110 AND 160* C. WITH A UREA AT A TEMPERTURE BETWEEN ABOUT 60 AND 110* C., SUBSEQUENTLY RAISING THE TEMPERATURE TO BETWEEN ABOUT 140 TO 200* C. TO DRIVE OFF SAID INERT ORGANIC LIQUID AND MAINTAINING THE REACTION MIXTURE AT THAT TEMPERATURE FOR A SUFFICIENT TIME TO ALLOW THE REACTION TO PROCEED SUBSTANTIALLY TO COMPLETION.
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) | 1959-01-02 | 1959-07-04 | 1960-01-03 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1963-01-02 | 1963-07-04 | 1964-01-03 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1967-01-02 | 1967-07-04 | 1968-01-03 | $7700.00 | Window Closed / Lapsed |