US3721472A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Coanda effect switch for handling and conveying workpieces on a layer of fluid
Assignee: AT&T Inc
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Filing: 1969-01-03
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Granted: 1973-03-20
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Expires: 1989-01-03
Abstract
Abstract A METHOD AND DEVICE UTILIZES THE COANDA EFFECT OF A FLUID FLOWING USE OF AN APERTURE AND OVER AN ADJACENT STEP TO MANIPULATE A WORKPIECE, SUCH AS A SLICE OF SEMICONDUCTOR MATERIAL, RELATIVE TO AN AERODYNAMIC CONVEYOR OR A PICKUP HEAD.
Inventors
- 👤 W Mammel
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-01 22:23
CPC Classifications
B; B65; B65G; B65G51/00; B65G51/02; B65G51/03; H; H10; H10P; H10P72/00; H10P72/30; H10P72/36
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
No citation records indexed.
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1976-03-19 | 1976-09-18 | 1977-03-20 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1980-03-19 | 1980-09-18 | 1981-03-20 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1984-03-19 | 1984-09-18 | 1985-03-20 | $7700.00 | Window Closed / Lapsed |