Patent US2768409A successfully refreshed from Google Patents.
US2768409A
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Assignee: Richards Wilcox Manufacturing Co
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Filing: 1953-06-08
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Granted: 1956-10-30
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Expires: 1973-06-08
Abstract
No abstract record available.
Inventors
- 👤 Miles R Lutter
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-08 22:26
CPC Classifications
E; E05; E05D; E05D3/00; E05D3/06; E05D3/12; E05Y; E05Y2900/00; E05Y2900/20
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1959-10-30 | 1960-04-30 | 1960-10-30 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1963-10-30 | 1964-04-30 | 1964-10-30 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1967-10-30 | 1968-04-30 | 1968-10-30 | $7700.00 | Window Closed / Lapsed |