Patent US3220799A successfully refreshed from Google Patents.
US3220799A
Expired / Lapsed
US
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Tetrafluorohydrazine
Assignee: Rohm and Haas Co
•
Filing: 1958-08-13
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Granted: 1965-11-30
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Expires: 1978-08-13
Abstract
No abstract record available.
Inventors
- 👤 Charles B Colburn
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-26 18:04
CPC Classifications
C; C01; C01B; C01B21/00; C01B21/082; C01B21/083; C01B21/0832
Claims Analysis
Total Claims: 4
Claim 1
Independent Claim
2 words
TETRAFLUOROHYDRIZINE (N2F4)
Claim 2
Dependent Claim
2 words
TETRAFLUOROHYDRIZINE (N2F4)
Claim 3
Dependent Claim
26 words
A PROCESS FOR PREPARING TETRAFLUOROHYDRAZINE WHICH COMPRISES PASSING NITROGEN TRIFLUORIDE OVER COPPER AT A TEMPERATURE BETWEEN 375* AND 450*C. AND SEPARATING TETRAFLUOROHYDRAZINE FROM THE REACTION MIXTURE.
Claim 4
Dependent Claim
26 words
A PROCESS FOR PREPARING TETRAFLUOROHYDRAZINE WHICH COMPRISES PASSING NITROGEN TRIFLUORIDE OVER COPPER AT A TEMPERATURE BETWEEN 375* AND 450*C. AND SEPARATING TETRAFLUOROHYDRAZINE FROM THE REACTION MIXTURE.
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) | 1968-11-29 | 1969-05-31 | 1969-11-30 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1972-11-29 | 1973-05-31 | 1973-11-30 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1976-11-29 | 1977-05-31 | 1977-11-30 | $7700.00 | Window Closed / Lapsed |