Patent US2813862A successfully refreshed from Google Patents.
US2813862A
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Process of preparation of heterocyclic compounds employing acetylene ethers
Assignee: Organon NV
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Filing: 1954-12-22
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Granted: 1957-11-19
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Expires: 1974-12-22
Abstract
No abstract record available.
Inventors
- 👤 Arens Josef Ferdinand
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-05 15:47
CPC Classifications
C; C07; C07D; C07D239/00; C07D239/02; C07D239/06; C07D233/00; C07D233/04; C07D233/06; C07D233/08; C07D233/10; C07D235/00; C07D235/02; C07D235/04; C07D235/06; C07D235/08; C07D243/00; C07D243/04; C07D263/00; C07D263/02; C07D263/08; C07D263/10; C07D263/12; C07D265/00; C07D265/04; C07D265/06; C07D265/08; C07D265/12; C07D265/14; C07D265/16; C07D267/00; C07D277/00; C07D277/02; C07D277/08; C07D277/10; C07D279/00; C07D279/04; C07D279/06; D; D06; D06M; D06M13/00; D06M13/322; D06M13/35
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
10 words
IN A PROCESS OF PREPARING HETEROCYCLIC COMPOUNDS OF THE FORMULA
Claim 2
Dependent Claim
10 words
IN A PROCESS OF PREPARING HETEROCYCLIC COMPOUNDS OF THE FORMULA
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) | 1960-11-18 | 1961-05-20 | 1961-11-19 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1964-11-18 | 1965-05-20 | 1965-11-19 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1968-11-18 | 1969-05-20 | 1969-11-19 | $7700.00 | Window Closed / Lapsed |