US3266848A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Transportation system with conveyor means
Assignee: Individual
•
Filing: 1965-04-01
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Granted: 1966-08-16
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Expires: 1985-04-01
Abstract
No abstract record available.
Inventors
- 👤 Alan R Pitkanen
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-25 06:20
CPC Classifications
B; B65; B65G; B65G51/00; B65G51/02; B65G51/03
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
164 words
A TRANSPORTATION SYSTEM COMPRISING: (A) A LONGITUDINAL ROADBED HAVING A LONGITUDINAL PASSAGE AND PROVIDED WITH UPPER, OPPOSITELY INREACHING FLANGES THAT DEFINE A SLOT OPEN TO SAID PASSAGE AND TO ATMOSPHERE, (B) A GRATING SPANNING ACROSS SAID SLOT AND HAVING AIRPASSING OPENINGS, (C) A FLEXIBLE AIR-IMPERVIOUS BELT BENEATH SAID FLANGES AND GRATING, SLACK BEING PROVIDED IN THE LONGITUDINAL EXTENT OF THE BELT AND FORMING A UNDULATION THEREIN, (D) A SLIDE MEMBER ABOVE SAID GRATING, AND (E) MEANS TO CREATE AIR PRESSURE IN SAID PASSAGE WHICH IS EFFECTIVE TO PRESS THE BELT UPWARDLY WITH ITS MARGINAL EDGES AT BOTH ENDS OF THE UNDULATION IN AIRSEALING CONTACT WITH THE FLANGES OF THE ROADBED, (F) THE SLIDE MEMBER BEING IN THE PATH OF ESCAPE OF AIR FROM THE PASSAGE, AROUNG THE EDGES OF THE UNDULATED PORTION OF THE BELT, AND THROUGH THE GRATING TO FORM AN ESCAPING AIR CUSHION FOR SAID SLIDE MEMBER, SAID MEMBER BEING STATIC DUE TO SYMMETRY OF PRESSURES ON BOTH SIDES OF THE UNDULATION.
Claim 2
Dependent Claim
164 words
A TRANSPORTATION SYSTEM COMPRISING: (A) A LONGITUDINAL ROADBED HAVING A LONGITUDINAL PASSAGE AND PROVIDED WITH UPPER, OPPOSITELY INREACHING FLANGES THAT DEFINE A SLOT OPEN TO SAID PASSAGE AND TO ATMOSPHERE, (B) A GRATING SPANNING ACROSS SAID SLOT AND HAVING AIRPASSING OPENINGS, (C) A FLEXIBLE AIR-IMPERVIOUS BELT BENEATH SAID FLANGES AND GRATING, SLACK BEING PROVIDED IN THE LONGITUDINAL EXTENT OF THE BELT AND FORMING A UNDULATION THEREIN, (D) A SLIDE MEMBER ABOVE SAID GRATING, AND (E) MEANS TO CREATE AIR PRESSURE IN SAID PASSAGE WHICH IS EFFECTIVE TO PRESS THE BELT UPWARDLY WITH ITS MARGINAL EDGES AT BOTH ENDS OF THE UNDULATION IN AIRSEALING CONTACT WITH THE FLANGES OF THE ROADBED, (F) THE SLIDE MEMBER BEING IN THE PATH OF ESCAPE OF AIR FROM THE PASSAGE, AROUNG THE EDGES OF THE UNDULATED PORTION OF THE BELT, AND THROUGH THE GRATING TO FORM AN ESCAPING AIR CUSHION FOR SAID SLIDE MEMBER, SAID MEMBER BEING STATIC DUE TO SYMMETRY OF PRESSURES ON BOTH SIDES OF THE UNDULATION.
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) | 1969-08-15 | 1970-02-14 | 1970-08-16 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1973-08-15 | 1974-02-14 | 1974-08-16 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1977-08-15 | 1978-02-14 | 1978-08-16 | $7700.00 | Window Closed / Lapsed |