US2456093A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Method of polymerization
Assignee: Shellmar Products Corp
•
Filing: 1943-03-24
•
Granted: 1948-12-14
•
Expires: 1963-03-24
Abstract
No abstract record available.
Inventors
- 👤 David A Swedlow
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-22 20:34
CPC Classifications
B; B29; B29C; B29C39/00; B29C39/003; B29C39/006; Y; Y10; Y10S; Y10S264/00; Y10S264/53; Y10S428/00; Y10S428/913; Y10T; Y10T442/00; Y10T442/30; Y10T442/3472; Y10T442/3528; Y10T442/3569
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
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USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1951-12-14 | 1952-06-14 | 1952-12-14 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1955-12-14 | 1956-06-14 | 1956-12-14 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1959-12-14 | 1960-06-14 | 1960-12-14 | $7700.00 | Window Closed / Lapsed |