US3485393A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Apparatus for handling material having an irregular surface and vacuum head therefor
Assignee: WAUKESHA CULVERT CO
•
Filing: 1967-05-25
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Granted: 1969-12-23
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Expires: 1987-05-25
Abstract
No abstract record available.
Inventors
- 👤 Perry J Wilder
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-30 15:55
CPC Classifications
B; B21; B21D; B21D13/00; B21D13/02; B21D43/00; B21D43/02; B21D43/18; B65; B65G; B65G47/00; B65G47/74; B65G47/90; B65G47/91; B65G47/917
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US2665013A
Cited
US2809769A
Cited
US2925612A
Cited
FR1408335A
Cited
US3351370A
Cited
US3322454A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1972-12-22 | 1973-06-23 | 1973-12-23 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1976-12-22 | 1977-06-23 | 1977-12-23 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1980-12-22 | 1981-06-23 | 1981-12-23 | $7700.00 | Window Closed / Lapsed |