Patent US2660199A successfully refreshed from Google Patents.
US2660199A
Expired / Lapsed
US
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Reinforced concrete conduit
Assignee: Individual
•
Filing: 1947-05-01
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Granted: 1953-11-24
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Expires: 1967-05-01
Abstract
No abstract record available.
Inventors
- 👤 Gustaf A Montgomery
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-30 12:40
CPC Classifications
B; B28; B28B; B28B21/00; B28B21/56; F; F16; F16L; F16L13/00; F16L13/02; F16L13/029; F16L25/00; F16L25/0027; F16L9/00; F16L9/08; Y; Y10; Y10T; Y10T403/00; Y10T403/16; Y10T403/1608
Claims Analysis
Total Claims: 0
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USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1956-11-23 | 1957-05-25 | 1957-11-24 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1960-11-23 | 1961-05-25 | 1961-11-24 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1964-11-23 | 1965-05-25 | 1965-11-24 | $7700.00 | Window Closed / Lapsed |