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US1218656A
Expired / Lapsed
US
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Urea and thiourea compounds.
Assignee: SYNTHETIC PATENTS CO Inc
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Filing: 1915-06-26
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Granted: 1917-03-13
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Expires: 1935-06-26
Abstract
No abstract record available.
Inventors
- 👤 Paul Thomaschewski
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-24 07:34
CPC Classifications
C; C07; C07C; C07C309/00; C07C309/01; C07C309/28; C07C309/45; C07C309/51
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) | 1920-03-12 | 1920-09-11 | 1921-03-13 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1924-03-12 | 1924-09-11 | 1925-03-13 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1928-03-12 | 1928-09-11 | 1929-03-13 | $7700.00 | Window Closed / Lapsed |