Patent US2544709A successfully refreshed from Google Patents.
US2544709A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Method of preparing low molecular weight isocyanates
Assignee: Armstrong World Industries Inc
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Filing: 1947-04-14
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Granted: 1951-03-13
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Expires: 1967-04-14
Abstract
No abstract record available.
Inventors
- 👤 Mason John Philip
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-04 06:40
CPC Classifications
C; C07; C07C; C07C263/00; C07C263/12
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
84 words
A PROCESS OF PREPARING LOW MOLECULAR WEIGHT ISOCYANATES WHICH COMPRISES REACTING A COMPOUND SELECTED FROM THE GROUP CONSISTING OF ACID HALIDES AND ACID ANHYDRIDES, DISSOLVED IN AN INERT WATERMISCIBLE ORGANIC SOLVENT, WITH AN AQUEOUS SOLUTION OF A NORMAL METAL AZIDE OF A METAL SELECTED FROM THE CLASS CONSISTING OF AN ALKALI METALS, THE ALKALINE EARTH METALS, AND MAGNESIUM AT A TEMPERATURE BETWEEN ROOM TEMPERATURE AND -45* C. TO OBTAIN AN ACID AZIDE, AND DECOMPOSING THE ACID AZIDE TO OBTAIN A LOW MOLECULAR WEIGHT ISOCYANATE.
Claim 2
Dependent Claim
84 words
A PROCESS OF PREPARING LOW MOLECULAR WEIGHT ISOCYANATES WHICH COMPRISES REACTING A COMPOUND SELECTED FROM THE GROUP CONSISTING OF ACID HALIDES AND ACID ANHYDRIDES, DISSOLVED IN AN INERT WATERMISCIBLE ORGANIC SOLVENT, WITH AN AQUEOUS SOLUTION OF A NORMAL METAL AZIDE OF A METAL SELECTED FROM THE CLASS CONSISTING OF AN ALKALI METALS, THE ALKALINE EARTH METALS, AND MAGNESIUM AT A TEMPERATURE BETWEEN ROOM TEMPERATURE AND -45* C. TO OBTAIN AN ACID AZIDE, AND DECOMPOSING THE ACID AZIDE TO OBTAIN A LOW MOLECULAR WEIGHT ISOCYANATE.
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) | 1954-03-12 | 1954-09-11 | 1955-03-13 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1958-03-12 | 1958-09-11 | 1959-03-13 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1962-03-12 | 1962-09-11 | 1963-03-13 | $7700.00 | Window Closed / Lapsed |