Patent US2668686A successfully refreshed from Google Patents.
US2668686A
Expired / Lapsed
US
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Polygon cone draft tube
Assignee: Individual
•
Filing: 1949-02-10
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Granted: 1954-02-09
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Expires: 1969-02-10
Abstract
No abstract record available.
Inventors
- 👤 Percy H Thomas
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-01 06:32
CPC Classifications
F; F03; F03B; F03B11/00; F03B11/02; F05; F05B; F05B2250/00; F05B2250/10; F05B2250/13; F05B2250/131; Y; Y02; Y02E; Y02E10/00; Y02E10/20
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US1223841A
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US1519173A
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US1583415A
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US1467168A
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US1515211A
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US1681706A
Cited
US2191341A
Cited
US2131611A
Cited
US2319884A
Cited
US2524390A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1957-02-08 | 1957-08-10 | 1958-02-09 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1961-02-08 | 1961-08-10 | 1962-02-09 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1965-02-08 | 1965-08-10 | 1966-02-09 | $7700.00 | Window Closed / Lapsed |