US2383922A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Depolymerization of polymers of styrene and ring substituted methyl styrenes
Assignee: United Gas Improvement Co
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Filing: 1942-02-13
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Granted: 1945-08-28
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Expires: 1962-02-13
Abstract
No abstract record available.
Inventors
- 👤 Frank J Soday
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-01 14:46
CPC Classifications
C; C07; C07C; C07C4/00; C07C4/22; C07C7/00; C07C7/148; C07C7/177; Y; Y10; Y10S; Y10S260/00; Y10S260/43
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) | 1948-08-27 | 1949-02-26 | 1949-08-28 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1952-08-27 | 1953-02-26 | 1953-08-28 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1956-08-27 | 1957-02-26 | 1957-08-28 | $7700.00 | Window Closed / Lapsed |