Patent US2818812A successfully refreshed from Google Patents.
US2818812A
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US
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Assignee: Individual
•
Filing: 1952-10-14
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Granted: 1958-01-07
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Expires: 1972-10-14
Abstract
No abstract record available.
Inventors
- 👤 Donald H Shenk
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-03 15:45
CPC Classifications
F; F42; F42C; F42C15/00; F42C15/20; F42C15/22; F42C1/00; F42C1/02; F42C1/04; F42C1/06; F42C9/00; F42C9/14; F42C9/16; F42C9/18
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) | 1961-01-06 | 1961-07-08 | 1962-01-07 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1965-01-06 | 1965-07-08 | 1966-01-07 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1969-01-06 | 1969-07-08 | 1970-01-07 | $7700.00 | Window Closed / Lapsed |