Patent US2720872A successfully refreshed from Google Patents.
US2720872A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Two cycle internal combustion engines
Assignee: Individual
•
Filing: 1953-01-30
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Granted: 1955-10-18
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Expires: 1973-01-30
Abstract
No abstract record available.
Inventors
- 👤 Yokoi Motoaki
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-30 20:22
CPC Classifications
F; F02; F02B; F02B25/00; F02B2700/00; F02B2700/03; F02B2700/031
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US1514476A
Cited
US1744249A
Cited
US1702875A
Cited
US1887661A
Cited
US2076976A
Cited
FR917340A
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 |