Patent US1866283A successfully refreshed from Google Patents.
US3609849A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Forming rolls
Assignee: Individual
•
Filing: 1969-04-09
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Granted: 1971-10-05
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Expires: 1989-04-09
Abstract
Abstract THIS INVENTION IS DIRECTED TO COMPOSITE, BI-METALLIC FORMING ROLLS PRODUCED BY POWDER METALLURGICAL METHODS WHICH ARE USED TO FORM STEEL BARS THE COMPOSITE, BIMETALLIC ROLLS ARE NMADE UP OF A WORKING PART OD CEMENTED TUNGSTEN CARBIDE WHICH IS METALLURGICALLY BOUND TO A CASING MATERIAL OF VARIOUS METALS OR ALLOY COMPOSITIONS.
Inventors
- 👤 Jan M Krol
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-29 03:01
CPC Classifications
B; B21; B21B; B21B27/00; B21B27/02; B21B27/03; B21B27/035; F; F16; F16C; F16C13/00; F16C13/006; B21B13/00; B21B13/005
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) | 1974-10-04 | 1975-04-05 | 1975-10-05 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1978-10-04 | 1979-04-05 | 1979-10-05 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1982-10-04 | 1983-04-05 | 1983-10-05 | $7700.00 | Window Closed / Lapsed |