Patent US3074764A successfully refreshed from Google Patents.
US3074764A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Air track
Assignee: Martin Engineering Co
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Filing: 1959-12-03
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Granted: 1963-01-22
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Expires: 1979-12-03
Abstract
No abstract record available.
Inventors
- 👤 William R Bertelsen
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-25 01:30
CPC Classifications
B; B62; B62D; B62D55/00; B62D55/08; B62D55/104; B62D55/112; B62D55/1125
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
132 words
AN AIR TRACK ASSEMBLY COMPRISING A CARRIER, A DRIVE WHEEL DISPOSED BEYOND ONE END OF THE CARRIER, AND A FLEXIBLE TRACK ENTRAINED OVER BOTH SAID CARRIER AND DRIVE WHEEL, SAID CARRIER AND DRIVE WHEEL TOGETHER PROVIDING COMPLEMENTARY HOUSING MEANS THAT FILL THE INTERIOR OF SAID FLEXIBLE TRACK, SAID CARRIER HAVING A HOLLOW CHAMBER WITH COMMUNICATING APERTURES FORMED THROUGH A PREDETERMINED PORTION THEREOF IN POSITIONS LYING ADJACENT SAID ENTRAINED FLEXIBLE TRACK, AND AN AIR SUPPLY MEANS CONNECTED WITH SAID CARRIER CHAMBER TO INTRODUCE AIR UNDER PRESSURE INTO SAID CHAMBER FOR DISPERSION THROUGH SAID CHAMBER APERTURES INTO AN AREA BETWEEN SAID TRACK AND CARRIER TO ESTABLISH A GIVEN PRESSURIZED CUSHION OF AIR IN SAID AREA TO URGE SAID TRACK AND CARRIER OUT OF PHYSICAL CONTACT RELATION WITH RESPECT TO EACH OTHER UNDER OPERATIVE CONDITIONS.
Claim 2
Dependent Claim
132 words
AN AIR TRACK ASSEMBLY COMPRISING A CARRIER, A DRIVE WHEEL DISPOSED BEYOND ONE END OF THE CARRIER, AND A FLEXIBLE TRACK ENTRAINED OVER BOTH SAID CARRIER AND DRIVE WHEEL, SAID CARRIER AND DRIVE WHEEL TOGETHER PROVIDING COMPLEMENTARY HOUSING MEANS THAT FILL THE INTERIOR OF SAID FLEXIBLE TRACK, SAID CARRIER HAVING A HOLLOW CHAMBER WITH COMMUNICATING APERTURES FORMED THROUGH A PREDETERMINED PORTION THEREOF IN POSITIONS LYING ADJACENT SAID ENTRAINED FLEXIBLE TRACK, AND AN AIR SUPPLY MEANS CONNECTED WITH SAID CARRIER CHAMBER TO INTRODUCE AIR UNDER PRESSURE INTO SAID CHAMBER FOR DISPERSION THROUGH SAID CHAMBER APERTURES INTO AN AREA BETWEEN SAID TRACK AND CARRIER TO ESTABLISH A GIVEN PRESSURIZED CUSHION OF AIR IN SAID AREA TO URGE SAID TRACK AND CARRIER OUT OF PHYSICAL CONTACT RELATION WITH RESPECT TO EACH OTHER UNDER OPERATIVE CONDITIONS.
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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) | 1966-01-21 | 1966-07-23 | 1967-01-22 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1970-01-21 | 1970-07-23 | 1971-01-22 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1974-01-21 | 1974-07-23 | 1975-01-22 | $7700.00 | Window Closed / Lapsed |