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Patent US2420545A successfully refreshed from Google Patents.
US2420545A
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Dental flask
Assignee: Portland Plastics Ltd
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Filing: 1944-12-29
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Granted: 1947-05-13
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Expires: 1964-12-29
Abstract
No abstract record available.
Inventors
- 👤 Leader Sidney Arthur
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-08 23:43
CPC Classifications
A; A61; A61C; A61C13/00; A61C13/12; A61C13/16; Y; Y10; Y10T; Y10T292/00; Y10T292/20; Y10T292/205; Y10T292/209
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US1537884A
Cited
US1613506A
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US1922875A
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US2102266A
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US2243950A
Cited
US2359152A
Cited
US2333833A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1950-05-12 | 1950-11-11 | 1951-05-13 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1954-05-12 | 1954-11-11 | 1955-05-13 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1958-05-12 | 1958-11-11 | 1959-05-13 | $7700.00 | Window Closed / Lapsed |