US3012591A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Gas purging method and apparatus
Assignee: Union Carbide Corp
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Filing: 1958-12-18
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Granted: 1961-12-12
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Expires: 1978-12-18
Abstract
No abstract record available.
Inventors
- 👤 Peter A Mccormack
- 👤 Jr Frederick R Job
- 👤 Maurice F Hoffman
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-25 18:27
CPC Classifications
B; B23; B23K; B23K35/00; B23K35/22; B23K35/38; C; C21; C21D; C21D1/00; C21D1/74; C21D1/767; C22; C22F; C22F1/00; C22F1/02; C30; C30B; C30B15/00
Claims Analysis
Total Claims: 0
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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) | 1964-12-11 | 1965-06-12 | 1965-12-12 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1968-12-11 | 1969-06-12 | 1969-12-12 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1972-12-11 | 1973-06-12 | 1973-12-12 | $7700.00 | Window Closed / Lapsed |