US3314594A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Apparatus for compressing or expanding a medium, which apparatus includes a control device for regulating the amount of dead space
Assignee: US Philips Corp
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Filing: 1964-09-30
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Granted: 1967-04-18
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Expires: 1984-09-30
Abstract
No abstract record available.
Inventors
- 👤 Rietdijk Johan Adriaan
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 05:12
CPC Classifications
F; F04; F04B; F04B39/00; F04B39/04; F04B39/041; F04B39/044; F04B35/00; F04B35/008; F04B49/00; F04B49/12; F04B49/121; F04B53/00; F04B53/14; F04B53/142; F16; F16J; F16J3/00; F16J3/06; F25; F25B; F25B9/00; F25B9/06
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
213 words
AN APPARATUS FOR COMPRESSING OR EXPANDING A MEDIUM COMPRISING AT LEAST ONE CYLINDER HAVING A WORKING SPACE THEREIN, A FIRST PISTON-SHAPED MEMBER ADAPTED TO RECIPROCATE IN SAID CYLINDER WHEREBY THE VOLUME OF SAID WORKING SPACE IS VARIED, A CONTROL DEVICE FOR SAID APPARATUS FOR REGULATING THE RELATIVE VOLUME VARIATIONS OF SAID WORKING SPACE BY CONTROLLING THE AMOUNT OF DEAD SPACE THEREIN, A DRIVING MEANS, A SECOND PISTON-SHAPED MEMBER COUPLED TO SAID DRIVING MEANS, A ROLLING DIAPHRAGM, AT LEAST THE SEAL BETWEEN SAID FIRST PISTON-SHAPED MEMBER AND THE ADJACENT WALL OF SAID CYLINDER BEING SAID ROLLING DIAPHRAGM, SAID ROLLING DIAPHRAGM BEING SUPPORTED ON AT LEAST ONE SIDE BY LIQUID, SAID CONTROL DEVICE BEING PROVIDED TO MAINTAIN ACROSS SAID ROLLING DIAPHRAGM A PRESSURE DIFFERENCE ALWAYS IN THE SAME DIRECTION AND SUBSTANTIALLY CONSTANT AT LEAST DURING EACH STROKE, THE SPACE BETWEEN SAID FIRST AND SECOND PISTON-SHAPED MEMBERS WHICH CONTAINS A COLUMN OF LIQUID BEING PROVIDED WITH AN INLET AND AN OUTLET FOR SAID LIQUID BY MEANS OF WHICH THE AMOUNT OF LIQUID IN SAID SPACE MAY BE VARIED, AND SAID COLUMN OF LIQUID BEING IN COMPLETELY UNRESTRICTED OPEN COMMUNICATION WITH THE LIQUID SUPPORTING SAID ROLLING DIAPHRAGM SO THAT THE PRESSURE OF SAID LIQUID SUPPORTING SAID ROLLING DIAPHRAGM AND THE PRESSURE OF THE LIQUID COLUMN ARE EQUAL.
Claim 2
Independent Claim
213 words
AN APPARATUS FOR COMPRESSING OR EXPANDING A MEDIUM COMPRISING AT LEAST ONE CYLINDER HAVING A WORKING SPACE THEREIN, A FIRST PISTON-SHAPED MEMBER ADAPTED TO RECIPROCATE IN SAID CYLINDER WHEREBY THE VOLUME OF SAID WORKING SPACE IS VARIED, A CONTROL DEVICE FOR SAID APPARATUS FOR REGULATING THE RELATIVE VOLUME VARIATIONS OF SAID WORKING SPACE BY CONTROLLING THE AMOUNT OF DEAD SPACE THEREIN, A DRIVING MEANS, A SECOND PISTON-SHAPED MEMBER COUPLED TO SAID DRIVING MEANS, A ROLLING DIAPHRAGM, AT LEAST THE SEAL BETWEEN SAID FIRST PISTON-SHAPED MEMBER AND THE ADJACENT WALL OF SAID CYLINDER BEING SAID ROLLING DIAPHRAGM, SAID ROLLING DIAPHRAGM BEING SUPPORTED ON AT LEAST ONE SIDE BY LIQUID, SAID CONTROL DEVICE BEING PROVIDED TO MAINTAIN ACROSS SAID ROLLING DIAPHRAGM A PRESSURE DIFFERENCE ALWAYS IN THE SAME DIRECTION AND SUBSTANTIALLY CONSTANT AT LEAST DURING EACH STROKE, THE SPACE BETWEEN SAID FIRST AND SECOND PISTON-SHAPED MEMBERS WHICH CONTAINS A COLUMN OF LIQUID BEING PROVIDED WITH AN INLET AND AN OUTLET FOR SAID LIQUID BY MEANS OF WHICH THE AMOUNT OF LIQUID IN SAID SPACE MAY BE VARIED, AND SAID COLUMN OF LIQUID BEING IN COMPLETELY UNRESTRICTED OPEN COMMUNICATION WITH THE LIQUID SUPPORTING SAID ROLLING DIAPHRAGM SO THAT THE PRESSURE OF SAID LIQUID SUPPORTING SAID ROLLING DIAPHRAGM AND THE PRESSURE OF THE LIQUID COLUMN ARE EQUAL.
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USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1970-04-17 | 1970-10-17 | 1971-04-18 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1974-04-17 | 1974-10-17 | 1975-04-18 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1978-04-17 | 1978-10-17 | 1979-04-18 | $7700.00 | Window Closed / Lapsed |