US3221877A
Expired / Lapsed
US
⏱️ 0.0 years remaining
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Assignee: Individual
•
Filing: 1962-11-21
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Granted: 1965-12-07
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Expires: 1982-11-21
Abstract
No abstract record available.
Inventors
- 👤 Koning Jacob De
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-25 08:25
CPC Classifications
B; B07; B07B; B07B13/00; B07B13/04; B07B13/07
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
89 words
A DEVICE FOR SCREENING AND SIZING MATERIAL COMPRISING A STATIONARY SCREEN HAVING A PLURALITY OF SCREENING BARS SECURED ONLY AT THEIR MATERIAL FEED END AND EXTENDING BESIDE EACH OTHER IN THE MATERIAL FEED DIRECTION, SAID BARS BEING ALTERNATELY OF HIGH AND LOW ELASTICITY, AND MEANS FOR SECURING SAID BARS AT THEIR MATERAL FEED ENDS AND FOR CAUSING THE UPPER SURFACE OF THE BARS OF LOW ELASTICITY TO BE AT A HIGHER LEVEL THAN THE UPPER SURFACE OF THE BARS OF HIGH ELASTICITY THROUGHOUT THE LENGTHS OF THE RESPECTIVE BARS.
Claim 2
Independent Claim
89 words
A DEVICE FOR SCREENING AND SIZING MATERIAL COMPRISING A STATIONARY SCREEN HAVING A PLURALITY OF SCREENING BARS SECURED ONLY AT THEIR MATERIAL FEED END AND EXTENDING BESIDE EACH OTHER IN THE MATERIAL FEED DIRECTION, SAID BARS BEING ALTERNATELY OF HIGH AND LOW ELASTICITY, AND MEANS FOR SECURING SAID BARS AT THEIR MATERAL FEED ENDS AND FOR CAUSING THE UPPER SURFACE OF THE BARS OF LOW ELASTICITY TO BE AT A HIGHER LEVEL THAN THE UPPER SURFACE OF THE BARS OF HIGH ELASTICITY THROUGHOUT THE LENGTHS OF THE RESPECTIVE BARS.
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) | 1968-12-06 | 1969-06-07 | 1969-12-07 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1972-12-06 | 1973-06-07 | 1973-12-07 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1976-12-06 | 1977-06-07 | 1977-12-07 | $7700.00 | Window Closed / Lapsed |