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US2558495A
Expired / Lapsed
US
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Regulation of the amount of air in the cycle of an external-combustion engine
Assignee: Philips Laboratories Inc
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Filing: 1948-01-21
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Granted: 1951-06-26
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Expires: 1968-01-21
Abstract
No abstract record available.
Inventors
- 👤 Hendrik L Muller
- 👤 Wicher K Bouwman
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 17:55
CPC Classifications
F; F02; F02G; F02G1/00; F02G1/04; F02G1/043; F02G1/045; F02G1/05; Y; Y10; Y10T; Y10T137/00; Y10T137/0971; Y10T137/108; Y10T137/1116
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1954-06-25 | 1954-12-25 | 1955-06-26 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1958-06-25 | 1958-12-25 | 1959-06-26 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1962-06-25 | 1962-12-25 | 1963-06-26 | $7700.00 | Window Closed / Lapsed |