US2328333A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Polymerization process
Assignee: Dow Chemical Co
•
Filing: 1939-08-07
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Granted: 1943-08-31
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Expires: 1959-08-07
Abstract
No abstract record available.
Inventors
- 👤 Richard D Freeman
- 👤 Gordon P Schmelter
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-30 23:44
CPC Classifications
B; B29; B29C; B29C33/00; B29C33/56; B29C33/60; B29C33/62; B29C33/66; C; C08; C08F; C08F12/00; C08F12/02; C08F12/04; C08F12/06; C08F12/08
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) | 1946-08-30 | 1947-03-01 | 1947-08-31 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1950-08-30 | 1951-03-01 | 1951-08-31 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1954-08-30 | 1955-03-01 | 1955-08-31 | $7700.00 | Window Closed / Lapsed |