Patent DE338922C successfully refreshed from Google Patents.
Patent US2430591A successfully refreshed from Google Patents.
US2430591A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Ureides of glyoxylic and glycollic acids as catalysts for the polymerization of butadiene-1, 3 hydrocarbons
Assignee: Goodrich Corp
•
Filing: 1943-12-21
•
Granted: 1947-11-11
•
Expires: 1963-12-21
Abstract
No abstract record available.
Inventors
- 👤 William D Stewart
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-26 09:12
CPC Classifications
C; C08; C08F; C08F36/00; C08F36/02; C08F36/04
Claims Analysis
Total Claims: 0
No claims parsed yet. Click Sync Now above to re-index claims from Google Patents.
References Cited (Backward Citations)
DE255129C
Cited
US1935733A
Cited
GB318115A
Cited
US2197357A
Cited
US2234076A
Cited
US2211032A
Cited
US2265722A
Cited
US2234204A
Cited
US2317181A
Cited
US2380710A
Cited
US2354210A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1950-11-10 | 1951-05-12 | 1951-11-11 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1954-11-10 | 1955-05-12 | 1955-11-11 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1958-11-10 | 1959-05-12 | 1959-11-11 | $7700.00 | Window Closed / Lapsed |