Patent US3239849A successfully refreshed from Google Patents.
US3239849A
Expired / Lapsed
US
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Method of hydro-pneumatic conveying, system and apparatus
Assignee: Individual
•
Filing: 1962-03-22
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Granted: 1966-03-15
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Expires: 1982-03-22
Abstract
No abstract record available.
Inventors
- 👤 Liljendahl Sven Algot Joel
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-31 15:33
CPC Classifications
E; E03; E03F; E03F1/00; E03F1/006; E03D; E03D3/00; E03D3/12; Y; Y10; Y10S; Y10S4/00; Y10S4/09
Claims Analysis
Total Claims: 1
Claim 1
Independent Claim
126 words
A HYDRO-PNEUMATIC CONVEYING SYSTEM FOR CONVEYING SHORT LENGTH LIQUID VEHICLE PLUGS FOR A CONSIDERABLE DISTANCE BY PNEUMATIC FORCE, COMPRISING: (A) A PNEUMATIC CONDUIT WITH AT LEAST ONE ENTRANCE AND AN EXIT AND OF SUBSTANTIALLY CONSTANT INSIDE DIAMETER THROUGH WHICH IS WITHIN THE APPROXIMATE RANGE OF FROM 3/4" TO 2 1/2"; (B) AN EVACUATED RECEIVER IN FLUID COMMUNICATION WITH THE CONDUIT EXIT TO MAINTAIN THE INTERIOR OF SAID CONDUIT UNDER SUB-ATMOSPHERIC PRESSURE; (C) MEANS IN CONTROLLABLE FLUID COMMUNICATION WITH SAID CONDUIT ENTRANCE FOR; (1) AUTOMATICALLY CONTROLLING THE APPROXIMATE AMOUNT OF AND INTRODUCING A SMALL QUANTITY OF LIQUID AND MATERIAL TO BE CONVEYED INTO SAID CONDUIT THROUGH SAID ENTRANCE IN A PLUG FORM HAVING A DIAMETER DIMENSION FORMED DURING INTRODUCTION WHICH IS AT LEAST EQUAL TO THE INSIDE
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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) | 1969-03-14 | 1969-09-13 | 1970-03-15 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1973-03-14 | 1973-09-13 | 1974-03-15 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1977-03-14 | 1977-09-13 | 1978-03-15 | $7700.00 | Window Closed / Lapsed |