Patent US2820722A successfully refreshed from Google Patents.
US2820722A
Expired / Lapsed
US
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Method of preparing titanium, zirconium and tantalum
Assignee: Individual
•
Filing: 1954-09-03
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Granted: 1958-01-21
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Expires: 1974-09-03
Abstract
No abstract record available.
Inventors
- 👤 Richard J Fletcher
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 09:59
CPC Classifications
C; C22; C22B; C22B34/00; C22B34/10; C22B34/12; C22B34/129; C22B34/14; C22B34/20; C22B34/24
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
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GB485965A
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GB478916A
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US2405662A
Cited
US2694654A
Cited
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Cited
US2698812A
Cited
US2690980A
Cited
US2685532A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1961-01-20 | 1961-07-22 | 1962-01-21 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1965-01-20 | 1965-07-22 | 1966-01-21 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1969-01-20 | 1969-07-22 | 1970-01-21 | $7700.00 | Window Closed / Lapsed |