Patent US3452519A successfully refreshed from Google Patents.
US3452519A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Pressure stabilizing vent system for hydraulic circuit fluid reservoirs
Assignee: Caterpillar Inc
•
Filing: 1967-02-06
•
Granted: 1969-07-01
•
Expires: 1987-02-06
Abstract
No abstract record available.
Inventors
- 👤 Donald L Bianchetta
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-04 04:36
CPC Classifications
F; F15; F15B; F15B1/00; F15B1/26; Y; Y10; Y10T; Y10T137/00; Y10T137/794
Claims Analysis
Total Claims: 0
No claims parsed yet. Click Sync Now above to re-index claims from Google Patents.
References Cited (Backward Citations)
US1973258A
Cited
US2092925A
Cited
US2046093A
Cited
US2220328A
Cited
US2404468A
Cited
US2496883A
Cited
US2566463A
Cited
DE904007C
Cited
US2532888A
Cited
US2790578A
Cited
US2703153A
Cited
GB761710A
Cited
US2850877A
Cited
US2894530A
Cited
US3012631A
Cited
US2973830A
Cited
FR1237198A
Cited
GB882647A
Cited
FR1349759A
Cited
US3186391A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1972-06-30 | 1972-12-30 | 1973-07-01 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1976-06-30 | 1976-12-30 | 1977-07-01 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1980-06-30 | 1980-12-30 | 1981-07-01 | $7700.00 | Window Closed / Lapsed |