Patent US2472928A successfully refreshed from Google Patents.
US2472928A
Expired / Lapsed
US
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Piston for use in internalcombustion engines
Assignee: Individual
•
Filing: 1947-01-04
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Granted: 1949-06-14
•
Expires: 1967-01-04
Abstract
No abstract record available.
Inventors
- 👤 Tien Hsin-Ya
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-03 09:24
CPC Classifications
F; F02; F02B; F02B75/00; F02B75/04; F02B75/044
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US546441A
Cited
US1719092A
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US1010566A
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US1252269A
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US1634826A
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US1850474A
Cited
US1772931A
Cited
US2104802A
Cited
US2408511A
Cited
US2404467A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1952-06-13 | 1952-12-13 | 1953-06-14 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1956-06-13 | 1956-12-13 | 1957-06-14 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1960-06-13 | 1960-12-13 | 1961-06-14 | $7700.00 | Window Closed / Lapsed |