Patent US3158174A successfully refreshed from Google Patents.
Patent US3277795A successfully refreshed from Google Patents.
US3277795A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Piston cylinder means with fluid-coupled drive means and rolling diaphragm seal
Assignee: US Philips Corp
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Filing: 1964-09-30
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Granted: 1966-10-11
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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
2026-11-01 15:01
CPC Classifications
F; F25; F25B; F25B9/00; F25B9/06; F04; F04B; F04B39/00; F04B39/04; F04B39/041; F04B39/044; F04B53/00; F04B53/14; F04B53/142; F16; F16J; F16J3/00; F16J3/06
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
156 words
A DEVICE FOR COMPRESSING AND EXPANDING A MEDIUM COMPRISING AT LEAST ONE CYLINDER, A FIRST PISTON ADAPTED TO RECIPROCATE IN SAID CYLINDER AND TOGETHER DEFINING A WORKING SPACE, SAID FIRST PISTON WHEN RECIPROCATING VARYING THE VOLUME OF SAID WORKING SPACE, A ROLLING DIAPHRAGM SEAL BETWEEN SAID FIRST PISTON AND THE ADJACENT WALL OF SAID CYLINDER, ONE SIDE OF SAID SEAL FORMING PART OF THE BOUNDARY OF SAID WORKING SPACE AND THE OTHER SIDE THEREOF ENGAGING A COLUMN OF LIQUID IN SAID CYLINDER, MEANS FOR MAINTAINING A PRESSURE DIFFERENCE ACROSS SAID DIAPHRAGM SEAL WHICH IS SUBSTANTIALLY CONSTANT DURING THE RECIPROCATION OF SAID FIRST PISTON IN SAID CYLINDER, THE SIDE OF SAID FIRST PISTON REMOTE FROM SAID WORKING SPACE ENGAGING SAID LIQUID, A SECOND PISTON IN SAID CYLINDER SPACED FROM SAID FIRST PISTON AND FORMING A CHAMBER THEREBETWEEN, A DRIVING MEANS, MEANS COUPLING SAID SECOND PISTON TO SAID DRIVING MEANS, THE LIQUID ENGAGING SAID DIAPHRAGM SEAL AND THE
Claim 2
Independent Claim
156 words
A DEVICE FOR COMPRESSING AND EXPANDING A MEDIUM COMPRISING AT LEAST ONE CYLINDER, A FIRST PISTON ADAPTED TO RECIPROCATE IN SAID CYLINDER AND TOGETHER DEFINING A WORKING SPACE, SAID FIRST PISTON WHEN RECIPROCATING VARYING THE VOLUME OF SAID WORKING SPACE, A ROLLING DIAPHRAGM SEAL BETWEEN SAID FIRST PISTON AND THE ADJACENT WALL OF SAID CYLINDER, ONE SIDE OF SAID SEAL FORMING PART OF THE BOUNDARY OF SAID WORKING SPACE AND THE OTHER SIDE THEREOF ENGAGING A COLUMN OF LIQUID IN SAID CYLINDER, MEANS FOR MAINTAINING A PRESSURE DIFFERENCE ACROSS SAID DIAPHRAGM SEAL WHICH IS SUBSTANTIALLY CONSTANT DURING THE RECIPROCATION OF SAID FIRST PISTON IN SAID CYLINDER, THE SIDE OF SAID FIRST PISTON REMOTE FROM SAID WORKING SPACE ENGAGING SAID LIQUID, A SECOND PISTON IN SAID CYLINDER SPACED FROM SAID FIRST PISTON AND FORMING A CHAMBER THEREBETWEEN, A DRIVING MEANS, MEANS COUPLING SAID SECOND PISTON TO SAID DRIVING MEANS, THE LIQUID ENGAGING SAID DIAPHRAGM SEAL AND THE
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) | 1969-10-10 | 1970-04-11 | 1970-10-11 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1973-10-10 | 1974-04-11 | 1974-10-11 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1977-10-10 | 1978-04-11 | 1978-10-11 | $7700.00 | Window Closed / Lapsed |