US2888374A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Process for depth-hardening of long tubes or the like
Assignee: Vodafone GmbH
•
Filing: 1955-05-17
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Granted: 1959-05-26
•
Expires: 1975-05-17
Abstract
No abstract record available.
Inventors
- 👤 Heinenberg Fritz
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-29 05:23
CPC Classifications
C; C21; C21D; C21D9/00; C21D9/08; C21D9/085
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
46 words
A PROCESS FOR THE DEPTH HARDENING OF LONG TUBES FROM THE INSIDE OF A COOLING LIQUID, CHARACTERIZED IN THAT THE TUBE IS LEFT IN A HORIZONTAL POSITION AS IT COMES FROM THE MANUFACTURING OPERATION AND THE COOLING LIQUID IS INTRODUCED INTO THE TUBE AT AN OPEN
Claim 2
Dependent Claim
46 words
A PROCESS FOR THE DEPTH HARDENING OF LONG TUBES FROM THE INSIDE OF A COOLING LIQUID, CHARACTERIZED IN THAT THE TUBE IS LEFT IN A HORIZONTAL POSITION AS IT COMES FROM THE MANUFACTURING OPERATION AND THE COOLING LIQUID IS INTRODUCED INTO THE TUBE AT AN OPEN
References Cited (Backward Citations)
US1513974A
Cited
GB371080A
Cited
US1893979A
Cited
US2169555A
Cited
US2239796A
Cited
US2545028A
Cited
GB682777A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1962-05-25 | 1962-11-24 | 1963-05-26 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1966-05-25 | 1966-11-24 | 1967-05-26 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1970-05-25 | 1970-11-24 | 1971-05-26 | $7700.00 | Window Closed / Lapsed |