Patent US2804197A successfully refreshed from Google Patents.
US2804197A
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Assignee: Individual
•
Filing: 1954-02-12
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Granted: 1957-08-27
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Expires: 1974-02-12
Abstract
No abstract record available.
Inventors
- 👤 William R Popkess
- 👤 Lewis L Johnson
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-29 23:21
CPC Classifications
G; G07; G07D; G07D9/00; G07D9/002
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US455624A
Cited
US645635A
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US1386717A
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GB308402A
Cited
US1859401A
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DE665284C
Cited
US2583081A
Cited
US2508283A
Cited
US2589593A
Cited
US2608291A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1960-08-26 | 1961-02-25 | 1961-08-27 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1964-08-26 | 1965-02-25 | 1965-08-27 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1968-08-26 | 1969-02-25 | 1969-08-27 | $7700.00 | Window Closed / Lapsed |