Patent US2350446A successfully refreshed from Google Patents.
US2350446A
Expired / Lapsed
US
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Production of aminopyrans
Assignee: Carbide and Carbon Chemicals Corp
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Filing: 1942-03-25
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Granted: 1944-06-06
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Expires: 1962-03-25
Abstract
No abstract record available.
Inventors
- 👤 Thomas F Carruthers
- 👤 Robert W Kiefer
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-09 00:09
CPC Classifications
C; C10; C10L; C10L1/00; C10L1/10; C10L1/14; C10L1/22; C10L1/222; C10L1/2222; C10L1/2225; C07; C07D; C07D309/00; C07D309/02; C07D309/04
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) | 1947-06-06 | 1947-12-06 | 1948-06-06 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1951-06-06 | 1951-12-06 | 1952-06-06 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1955-06-06 | 1955-12-06 | 1956-06-06 | $7700.00 | Window Closed / Lapsed |