Patent US2931887A successfully refreshed from Google Patents.
US2931887A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Tube arrangement
Assignee: Individual
•
Filing: 1956-10-01
•
Granted: 1960-04-05
•
Expires: 1976-10-01
Abstract
No abstract record available.
Inventors
- 👤 Leist Karl
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-06 01:49
CPC Classifications
B; B23; B23K; B23K11/00; B23K11/28
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
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US1008628A
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US1949251A
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US2057017A
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US2139499A
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US2583665A
Cited
US2614198A
Cited
US2743342A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1963-04-05 | 1963-10-05 | 1964-04-05 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1967-04-05 | 1967-10-05 | 1968-04-05 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1971-04-05 | 1971-10-05 | 1972-04-05 | $7700.00 | Window Closed / Lapsed |