US3518748A
Expired / Lapsed
US
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Concrete prestressing method
Assignee: HOWLETT MACHINE WORKS
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Filing: 1967-04-12
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Granted: 1970-07-07
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Expires: 1987-04-12
Abstract
No abstract record available.
Inventors
- 👤 James W Howlett
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-30 06:34
CPC Classifications
E; E04; E04G; E04G21/00; E04G21/12; E04G21/121; E04H; E04H7/00; E04H7/02; E04H7/18; E04H7/20; E04G2021/127; Y; Y10; Y10T; Y10T29/00; Y10T29/49; Y10T29/49826; Y10T29/49863; Y10T29/49874; Y10T29/49947; Y10T29/49948; Y10T29/49963; Y10T403/00; Y10T403/57; Y10T403/5793; Y10T403/70; Y10T403/7047; Y10T403/7051; Y10T403/7052; Y10T403/7058
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1973-07-06 | 1974-01-05 | 1974-07-07 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1977-07-06 | 1978-01-05 | 1978-07-07 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1981-07-06 | 1982-01-05 | 1982-07-07 | $7700.00 | Window Closed / Lapsed |