US2820347A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Two-stage master cylinder for hydraulic systems
Assignee: Individual
•
Filing: 1954-01-27
•
Granted: 1958-01-21
•
Expires: 1974-01-27
Abstract
No abstract record available.
Inventors
- 👤 Highland Olaf
- 👤 Leon A Chelmo
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-25 10:11
CPC Classifications
B; B60; B60T; B60T11/00; B60T11/10; B60T11/16; B60T11/224
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US2104735A
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US2095512A
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US2322009A
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US2298848A
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US2335069A
Cited
US2381930A
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US2410169A
Cited
US2518821A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1961-01-20 | 1961-07-22 | 1962-01-21 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1965-01-20 | 1965-07-22 | 1966-01-21 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1969-01-20 | 1969-07-22 | 1970-01-21 | $7700.00 | Window Closed / Lapsed |