US3151002A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Methods of selective carburization of ferrous metal surfaces and materials therefor
Assignee: ZF Friedrichshafen AG
•
Filing: 1960-01-18
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Granted: 1964-09-29
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Expires: 1980-01-18
Abstract
No abstract record available.
Inventors
- 👤 Benz Willi
- 👤 Ege Kurt
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-02 18:11
CPC Classifications
C; C23; C23C; C23C8/00; C23C8/04
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
80 words
THE METHOD OF SELECTIVE CARBURIZATION OF THE SURFACE OF A FERROUS METAL WHICH COMPRISES APPLYING TO SUCH AREA AS IS NOT TO BE CARBURIZED A COATING WITH A MEMBER SELECTED FROM THE GROUP CONSISTING OF BORIC ACID AND BORIC ACID ANHYDRIDE, AND AN ORGANIC ANHYDROUS BINDING AGENT, IN EFFECTIVE AMOUNTS TO FORM A RESIST HAVING A COKING RESIDUE DURING CARBURIZATION, THEN CARBURIZING SAID METAL AT A TEMPERATURE WHEREAT SAID BINDING AGENT FORMS SAID COKING RESIDUE, AND SUBSEQUENTLY REMOVING SAID COATING.
Claim 2
Independent Claim
80 words
THE METHOD OF SELECTIVE CARBURIZATION OF THE SURFACE OF A FERROUS METAL WHICH COMPRISES APPLYING TO SUCH AREA AS IS NOT TO BE CARBURIZED A COATING WITH A MEMBER SELECTED FROM THE GROUP CONSISTING OF BORIC ACID AND BORIC ACID ANHYDRIDE, AND AN ORGANIC ANHYDROUS BINDING AGENT, IN EFFECTIVE AMOUNTS TO FORM A RESIST HAVING A COKING RESIDUE DURING CARBURIZATION, THEN CARBURIZING SAID METAL AT A TEMPERATURE WHEREAT SAID BINDING AGENT FORMS SAID COKING RESIDUE, AND SUBSEQUENTLY REMOVING SAID COATING.
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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) | 1967-09-29 | 1968-03-30 | 1968-09-29 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1971-09-29 | 1972-03-30 | 1972-09-29 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1975-09-29 | 1976-03-30 | 1976-09-29 | $7700.00 | Window Closed / Lapsed |