US3029490A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Post-tensioning method for prestressing members
Assignee: Prescon Corp
•
Filing: 1954-11-15
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Granted: 1962-04-17
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Expires: 1974-11-15
Abstract
No abstract record available.
Inventors
- 👤 Karl H Middendorf
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 19:28
CPC Classifications
E; E04; E04G; E04G21/00; E04G21/12; Y; Y10; Y10S; Y10S29/00; Y10S29/029; Y10T; Y10T29/00; Y10T29/49; Y10T29/49826; Y10T29/49863; Y10T29/49874
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US1684663A
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US1781699A
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US2255022A
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US2371882A
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US2414011A
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US2319105A
Cited
US2535100A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1965-04-16 | 1965-10-16 | 1966-04-17 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1969-04-16 | 1969-10-16 | 1970-04-17 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1973-04-16 | 1973-10-16 | 1974-04-17 | $7700.00 | Window Closed / Lapsed |