Patent US3315768A successfully refreshed from Google Patents.
US3315768A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Hydraulic shaft positioning mechanism
Assignee: Collins Radio Co
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Filing: 1965-11-22
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Granted: 1967-04-25
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Expires: 1985-11-22
Abstract
No abstract record available.
Inventors
- 👤 William B Stuhler
- 👤 Raymond A Zandonatti
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-30 20:37
CPC Classifications
F; F15; F15B; F15B21/00; F15B21/10
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
108 words
A HYDRAULIC DEVICE COMPRISING: A CASING AND SHAFT MEANS; SAID SHAFT MEANS BEING POSITIONED IN SAID CASING; MEANS ATTACHED TO SAID SHAFT MEANS FOR SEPARATING SAID CASING INTO A FIRST, A SECOND, AND A THIRD SEALED, CHAMBERS, AND A FOURTH CHAMBER OPEN TO THE ATMOSPHERE; FIRST FLUID COMMUNICATION MEANS CONNECTING SAID FIRST AND SECOND CHAMBERS; AND SECOND FLUID COMMUNICATION MEANS CONNECTING SAID SECOND AND THIRD CHAMBERS; THE CROSS-SECTIONAL AREA OF SAID FIRST CHAMBER BEING RELATED TO THE EFFECTIVE CROSS-SECTIONAL AREAS OF SAID SECOND AND THIRD CHAMBERS SUCH THAT A CHANGE OF VOLUME OF SAID FIRST CHAMBER EQUALS THE TOTAL CHANGE OF VOLUME OF SAID SECOND AND THIRD CHAMBERS.
Claim 2
Dependent Claim
108 words
A HYDRAULIC DEVICE COMPRISING: A CASING AND SHAFT MEANS; SAID SHAFT MEANS BEING POSITIONED IN SAID CASING; MEANS ATTACHED TO SAID SHAFT MEANS FOR SEPARATING SAID CASING INTO A FIRST, A SECOND, AND A THIRD SEALED, CHAMBERS, AND A FOURTH CHAMBER OPEN TO THE ATMOSPHERE; FIRST FLUID COMMUNICATION MEANS CONNECTING SAID FIRST AND SECOND CHAMBERS; AND SECOND FLUID COMMUNICATION MEANS CONNECTING SAID SECOND AND THIRD CHAMBERS; THE CROSS-SECTIONAL AREA OF SAID FIRST CHAMBER BEING RELATED TO THE EFFECTIVE CROSS-SECTIONAL AREAS OF SAID SECOND AND THIRD CHAMBERS SUCH THAT A CHANGE OF VOLUME OF SAID FIRST CHAMBER EQUALS THE TOTAL CHANGE OF VOLUME OF SAID SECOND AND THIRD CHAMBERS.
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) | 1970-04-24 | 1970-10-24 | 1971-04-25 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1974-04-24 | 1974-10-24 | 1975-04-25 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1978-04-24 | 1978-10-24 | 1979-04-25 | $7700.00 | Window Closed / Lapsed |