US3137213A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Automatic bleeder valve
Assignee: Brown and Sharpe Manufacturing Co
•
Filing: 1963-04-15
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Granted: 1964-06-16
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Expires: 1983-04-15
Abstract
No abstract record available.
Inventors
- 👤 Harold A Bryant
- 👤 Joseph H Marcotte
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-01 06:20
CPC Classifications
F; F15; F15B; F15B21/00; F15B21/04; F15B21/044
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
118 words
A HYDRAULIC PROPULSION SYSTEM FOR A MACHINE TOOL SUPPORT WHICH COMPRISES A HYDRAULIC CIRCUIT INCLUDING A HYDRAULIC CYLINDER CONNECTED TO MOVE THE SUPPORT, MEANS FOR SUPPLYING LIQUID AT AN OPERATING PRESSURE TO SAID HYDRAULIC CIRCUIT, AN EXHAUST CONNECTION INCLUDING A HYDRAULIC RESISTANCE THROUGH WHICH FLUID IS EXHAUSTED FROM SAID CIRCUIT AGAINST A BASE BACK PRESSURE, A START-AND-STOP VALVE IN SAID CIRCUIT SHIFTABLE BETWEEN ON AND STOP POSITIONS, AND HYDRAULIC CONNECTIONS IN SAID CIRCUIT OPERATIVE FOR THE ON POSITION OF SAID START-AND-STOP VALVE TO PRODUCE AN UNBALANCED PRESSURE IN SAID CYLINDER FOR MOVING SAID SUPPORT, AND FOR THE STOP POSITION OF SAID STARTAND-STOP VALVE TO PRODUCE A BALANCED PRESSURE IN SAID CYLINDER TO STOP SAID SUPPORT, BLEEDER CONNECTIONS FROM
Claim 2
Dependent Claim
118 words
A HYDRAULIC PROPULSION SYSTEM FOR A MACHINE TOOL SUPPORT WHICH COMPRISES A HYDRAULIC CIRCUIT INCLUDING A HYDRAULIC CYLINDER CONNECTED TO MOVE THE SUPPORT, MEANS FOR SUPPLYING LIQUID AT AN OPERATING PRESSURE TO SAID HYDRAULIC CIRCUIT, AN EXHAUST CONNECTION INCLUDING A HYDRAULIC RESISTANCE THROUGH WHICH FLUID IS EXHAUSTED FROM SAID CIRCUIT AGAINST A BASE BACK PRESSURE, A START-AND-STOP VALVE IN SAID CIRCUIT SHIFTABLE BETWEEN ON AND STOP POSITIONS, AND HYDRAULIC CONNECTIONS IN SAID CIRCUIT OPERATIVE FOR THE ON POSITION OF SAID START-AND-STOP VALVE TO PRODUCE AN UNBALANCED PRESSURE IN SAID CYLINDER FOR MOVING SAID SUPPORT, AND FOR THE STOP POSITION OF SAID STARTAND-STOP VALVE TO PRODUCE A BALANCED PRESSURE IN SAID CYLINDER TO STOP SAID SUPPORT, BLEEDER CONNECTIONS FROM
References Cited (Backward Citations)
No citation records indexed.
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1967-06-16 | 1967-12-16 | 1968-06-16 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1971-06-16 | 1971-12-16 | 1972-06-16 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1975-06-16 | 1975-12-16 | 1976-06-16 | $7700.00 | Window Closed / Lapsed |