US3021820A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Force balance system
Assignee: Holley Performance Products Inc
•
Filing: 1960-08-22
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Granted: 1962-02-20
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Expires: 1980-08-22
Abstract
No abstract record available.
Inventors
- 👤 Robert S Fleming
- 👤 Warren H Cowles
- 👤 Raymond L Ensinger
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-28 23:22
CPC Classifications
F; F02; F02C; F02C9/00; F02C9/16; G; G05; G05D; G05D13/00; G05D13/34; Y; Y10; Y10T; Y10T137/00; Y10T137/2278; Y10T137/2409
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) | 1965-02-19 | 1965-08-21 | 1966-02-20 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1969-02-19 | 1969-08-21 | 1970-02-20 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1973-02-19 | 1973-08-21 | 1974-02-20 | $7700.00 | Window Closed / Lapsed |