US3345218A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Preoxidation of stainless steel for glass-to-metal sealing
Assignee: OI Glass Inc
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Filing: 1964-04-02
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Granted: 1967-10-03
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Expires: 1984-04-02
Abstract
No abstract record available.
Inventors
- 👤 George B Brookover
- 👤 Carl J Hudecek
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-05 19:18
CPC Classifications
C; C23; C23C; C23C8/00; C23C8/80; C03; C03C; C03C27/00; C03C27/04; C03C27/042; C03C27/046; C22; C22C; C22C38/00; C22C38/08; C23C8/02; C23D; C23D3/00
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
91 words
THE METHOD OF PREOXIDIZING THE SURFACE OF CHROMEIRON AND CHROME-NICKEL-IRON ALLOY PARTS TO FACILITATE THEIR VACUUM-TIGHT SEALING TO GLASS COMPRISING THE STEPS OF SUBJECTING THE PARTS TO A FIRST OXIDATION CYCLE TO FORM AN OXIDE LAYER HAVING AN ENRICHED CHROMIUM OXIDE CONTENT, SUBJECTING THE OXIDIZED PARTS TO A REDUCTION CYCLE TO REDUCE THE OXIDES OF THE CHROMIUM-ENRIGHED SURFACE LAYER TO THE METALLIC STATE, AND SUBJECTING THE SAID REDUCED SURFACE LAYER TO A SECOND OXIDATION CYCLE TO CONVERT THE CHROMIUM-ENRICHED SURFACE LAYER TO A FIRMLY-BONDED ADHERENT OXIDE FILM ADAPTED TO GLASS SEALING.
Claim 2
Independent Claim
91 words
THE METHOD OF PREOXIDIZING THE SURFACE OF CHROMEIRON AND CHROME-NICKEL-IRON ALLOY PARTS TO FACILITATE THEIR VACUUM-TIGHT SEALING TO GLASS COMPRISING THE STEPS OF SUBJECTING THE PARTS TO A FIRST OXIDATION CYCLE TO FORM AN OXIDE LAYER HAVING AN ENRICHED CHROMIUM OXIDE CONTENT, SUBJECTING THE OXIDIZED PARTS TO A REDUCTION CYCLE TO REDUCE THE OXIDES OF THE CHROMIUM-ENRIGHED SURFACE LAYER TO THE METALLIC STATE, AND SUBJECTING THE SAID REDUCED SURFACE LAYER TO A SECOND OXIDATION CYCLE TO CONVERT THE CHROMIUM-ENRICHED SURFACE LAYER TO A FIRMLY-BONDED ADHERENT OXIDE FILM ADAPTED TO GLASS SEALING.
References Cited (Backward Citations)
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1970-10-02 | 1971-04-03 | 1971-10-03 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1974-10-02 | 1975-04-03 | 1975-10-03 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1978-10-02 | 1979-04-03 | 1979-10-03 | $7700.00 | Window Closed / Lapsed |