US3084847A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Automatic clearance pockets for compressors
Assignee: Nordberg Manufacturing Co
•
Filing: 1960-09-07
•
Granted: 1963-04-09
•
Expires: 1980-09-07
Abstract
No abstract record available.
Inventors
- 👤 Sydney S Smith
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-07 22:54
CPC Classifications
F; F04; F04B; F04B49/00; F04B49/10; F04B49/16
Claims Analysis
Total Claims: 1
Claim 1
Independent Claim
82 words
IN A DOUBLE ACTING ENGINE DRIVEN COMPRESSOR, A CYLINDER AND PISTON, CLEARANCE POCKETS AT EACH END OF THE CYLINDER AND A FREE PISTON IN EACH POCKET, MEANS FOR SUPPLYING AND EXHAUSTING HYDRAULIC FLUID FROM BEHIND THE FREE PISTONS TO VARY THE VOLUME OF THE CLEARANCE POCKETS IN COMMUNICATION WITH THE CYLINDER, INCLUDING AN INLET LINE AND AN OUTLET LINE CONNECTED TO EACH CLEARANCE POCKET BEHIND ITS FREE PISTON, CHECK VALVES IN THE INLET AND OUTLET LINES TO THE CLEARANCE POCKETS TO PREVENT
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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) | 1966-04-08 | 1966-10-08 | 1967-04-09 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1970-04-08 | 1970-10-08 | 1971-04-09 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1974-04-08 | 1974-10-08 | 1975-04-09 | $7700.00 | Window Closed / Lapsed |