US2647499A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Multiple valve cylinder head for internal-combustion engines
Assignee: Individual
•
Filing: 1949-07-23
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Granted: 1953-08-04
•
Expires: 1969-07-23
Abstract
No abstract record available.
Inventors
- 👤 Pielstick Gustav
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-28 16:10
CPC Classifications
F; F01; F01L; F01L1/00; F01L1/26; C; C03; C03C; C03C17/00; C03C17/06; C03C17/10; F02; F02B; F02B2275/00; F02B2275/34; F02F; F02F1/00; F02F1/24; F02F1/42; F02F1/4214; F02F2001/244; F02F2001/247
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
GB139894A
Cited
FR544229A
Cited
GB368077A
Cited
DE700396C
Cited
US2199259A
Cited
GB489995A
Cited
US2426879A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1956-08-03 | 1957-02-02 | 1957-08-04 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1960-08-03 | 1961-02-02 | 1961-08-04 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1964-08-03 | 1965-02-02 | 1965-08-04 | $7700.00 | Window Closed / Lapsed |