US2217846A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Condensation products of betainelike constitution and a process of preparing them
Assignee: GAF Chemicals Corp
•
Filing: 1939-03-14
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Granted: 1940-10-15
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Expires: 1959-03-14
Abstract
No abstract record available.
Inventors
- 👤 Orthner Ludwig
- 👤 Balle Gerhard
- 👤 Rosenbach Johann
- 👤 Bonstedt Kurt
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-30 23:40
CPC Classifications
C; C07; C07D; C07D295/00; C07D295/04; C07D295/14; C07D295/145; C07D295/15
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) | 1943-10-15 | 1944-04-15 | 1944-10-15 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1947-10-15 | 1948-04-15 | 1948-10-15 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1951-10-15 | 1952-04-15 | 1952-10-15 | $7700.00 | Window Closed / Lapsed |