Patent US2618820A successfully refreshed from Google Patents.
US2618820A
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Assignee: RICHARD A ALBRIGHT
•
Filing: 1950-07-17
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Granted: 1952-11-25
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Expires: 1970-07-17
Abstract
No abstract record available.
Inventors
- 👤 Francis L Struben
- 👤 Jr James W Fyle
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-22 23:39
CPC Classifications
E; E04; E04H; E04H15/00; E04H15/02; E04H15/06; E04H15/08
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US323418A
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US1845143A
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US1930595A
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US2277341A
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US2210460A
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US2424410A
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US2423402A
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US2427021A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1955-11-25 | 1956-05-26 | 1956-11-25 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1959-11-25 | 1960-05-26 | 1960-11-25 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1963-11-25 | 1964-05-26 | 1964-11-25 | $7700.00 | Window Closed / Lapsed |