Patent US2826829A successfully refreshed from Google Patents.
US2826829A
Expired / Lapsed
US
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Fraction demonstrating device
Assignee: Individual
•
Filing: 1954-07-01
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Granted: 1958-03-18
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Expires: 1974-07-01
Abstract
No abstract record available.
Inventors
- 👤 Evan G Koons
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-02 16:49
CPC Classifications
G; G09; G09B; G09B19/00; G09B19/02
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US356167A
Cited
US480119A
Cited
US508298A
Cited
DE393900C
Cited
GB190608118A
Cited
US1479147A
Cited
CH167194A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1961-03-17 | 1961-09-16 | 1962-03-18 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1965-03-17 | 1965-09-16 | 1966-03-18 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1969-03-17 | 1969-09-16 | 1970-03-18 | $7700.00 | Window Closed / Lapsed |