US2439374A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Methyl methacrylate compositions opaque to x-rays
Assignee: Portland Plastics Ltd
•
Filing: 1945-03-20
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Granted: 1948-04-13
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Expires: 1965-03-20
Abstract
No abstract record available.
Inventors
- 👤 Leader Sidney Arthur
- 👤 Gordon James Joseph
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-06 14:08
CPC Classifications
C; C08; C08K; C08K3/00; A; A61; A61K; A61K49/00; A61K49/04; A61K49/0433; A61K49/0442; C08K5/00; C08K5/02; Y; Y10; Y10S; Y10S623/00; Y10S623/924
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US1913127A
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US2098539A
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US2162178A
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US2334358A
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US2255940A
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US2346107A
Cited
US2269187A
Cited
US2343090A
Cited
US2293413A
Cited
US2404791A
Cited
US2335651A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1951-04-13 | 1951-10-13 | 1952-04-13 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1955-04-13 | 1955-10-13 | 1956-04-13 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1959-04-13 | 1959-10-13 | 1960-04-13 | $7700.00 | Window Closed / Lapsed |