Patent US2721085A successfully refreshed from Google Patents.
US2721085A
Expired / Lapsed
US
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Assignee: Individual
•
Filing: 1951-03-21
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Granted: 1955-10-18
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Expires: 1971-03-21
Abstract
No abstract record available.
Inventors
- 👤 Charles E Powell
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-29 12:17
CPC Classifications
B; B62; B62B; B62B1/00; B62B1/10; B62B1/12; B62B2202/00; B62B2202/40; B62B2202/408; Y; Y10; Y10S; Y10S280/00; Y10S280/02
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
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US780653A
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US1520630A
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US1547674A
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US1557549A
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US1761683A
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US2141881A
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US2415392A
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US2453388A
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US2605117A
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US2519146A
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US2521819A
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US2479467A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1958-10-17 | 1959-04-18 | 1959-10-18 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1962-10-17 | 1963-04-18 | 1963-10-18 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1966-10-17 | 1967-04-18 | 1967-10-18 | $7700.00 | Window Closed / Lapsed |