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Patent US3752845A successfully refreshed from Google Patents.
US3752845A
Expired / Lapsed
US
⏱️ 0.0 years remaining
N n bis halogenomethyl carbamic acid esters
Assignee: Hoechst AG
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Filing: 1969-07-08
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Granted: 1973-08-14
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Expires: 1989-07-08
Abstract
Abstract N,N-BIS-HALOGENOMETHYL-CARBAMATES ARE FORMED BY REACTING URETHANES WITH FORMALDEHYDE OR COMPOUNDS CAPABLE OF YIELDING FORMALDEHYDE AND HALOGENATING AGENTS, ESPECIALLY INORGANIC ACID HALIDES. THE COMPOUNDS ARE USEFUL INTERMEDIATES AND CROSS-LINKING AGENTS.
Inventors
- 👤 C Beermann
- 👤 V Georgi
- 👤 K Waldmann
- 👤 E Wolf
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-08 14:04
CPC Classifications
D; D06; D06M; D06M13/00; D06M13/322; D06M13/402; D06M13/425
Claims Analysis
Total Claims: 0
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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) | 1976-08-13 | 1977-02-12 | 1977-08-14 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1980-08-13 | 1981-02-12 | 1981-08-14 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1984-08-13 | 1985-02-12 | 1985-08-14 | $7700.00 | Window Closed / Lapsed |