US2771667A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Methods of making lubricating systems and devices
Assignee: PETER FRIES JR
•
Filing: 1950-09-26
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Granted: 1956-11-27
•
Expires: 1970-09-26
Abstract
No abstract record available.
Inventors
- 👤 Stuart O Sunden
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 15:49
CPC Classifications
F; F16; F16N; F16N7/00; F16N7/02; F16N7/10; B; B22; B22F; B22F3/00; B22F3/10; B22F3/11; B22F3/1103
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
54 words
THE PROCESS OF MAKING A POROUS FLOW RETARDING AND REGULATING PLUG, COMPRISING THE STEPS OF BRIQUETTING COPPER AND TIN OXIDE POWDERS WITH SILICA AND GRAPHITE, THEN HEATING THE MIXTURE, REDUCING THE OXIDES TO METAL AND INTERDIFFUSING THE FORMED COPPER AND TIN TO YIELD A STRONG BRONZE MATRIX WITH AN EXCESS OF GRAPHITE, FORMING AN
Claim 2
Dependent Claim
54 words
THE PROCESS OF MAKING A POROUS FLOW RETARDING AND REGULATING PLUG, COMPRISING THE STEPS OF BRIQUETTING COPPER AND TIN OXIDE POWDERS WITH SILICA AND GRAPHITE, THEN HEATING THE MIXTURE, REDUCING THE OXIDES TO METAL AND INTERDIFFUSING THE FORMED COPPER AND TIN TO YIELD A STRONG BRONZE MATRIX WITH AN EXCESS OF GRAPHITE, FORMING AN
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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) | 1959-11-27 | 1960-05-28 | 1960-11-27 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1963-11-27 | 1964-05-28 | 1964-11-27 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1967-11-27 | 1968-05-28 | 1968-11-27 | $7700.00 | Window Closed / Lapsed |