US2798467A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Scavenging and expansion volume extending trap mechanism for internal combustion engines
Assignee: Individual
•
Filing: 1954-04-28
•
Granted: 1957-07-09
•
Expires: 1974-04-28
Abstract
No abstract record available.
Inventors
- 👤 Robert B Davids
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-06 17:51
CPC Classifications
F; F02; F02D; F02D15/00; F02D15/04; F02B; F02B41/00
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US1682305A
Cited
GB126155A
Cited
US1384133A
Cited
US1525956A
Cited
US1568638A
Cited
US1788076A
Cited
US1839791A
Cited
US2352824A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1960-07-08 | 1961-01-07 | 1961-07-09 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1964-07-08 | 1965-01-07 | 1965-07-09 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1968-07-08 | 1969-01-07 | 1969-07-09 | $7700.00 | Window Closed / Lapsed |