US2660199A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Reinforced concrete conduit
Assignee: Individual
•
Filing: 1947-05-01
•
Granted: 1953-11-24
•
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 10:31
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
No claims parsed yet. Click Sync Now above to re-index claims from Google Patents.
References Cited (Backward Citations)
US599558A
Cited
US1441908A
Cited
US1830202A
Cited
US1934701A
Cited
US2191025A
Cited
US2092042A
Cited
US2153741A
Cited
US2160228A
Cited
US2325469A
Cited
US2250871A
Cited
US2224419A
Cited
US2234643A
Cited
US2405567A
Cited
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 |