Patent US3721177A successfully refreshed from Google Patents.
Patent US1948437A successfully refreshed from Google Patents.
US1948437A
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Process of producing cylinders
Assignee: HARRISBURG PIPE AND PIPE BENDI
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Filing: 1931-08-25
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Granted: 1934-02-20
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Expires: 1951-08-25
Abstract
No abstract record available.
Inventors
- 👤 Bowers John Frederick
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-28 14:07
CPC Classifications
B; B21; B21D; B21D51/00; B21D51/16; B21D51/24; F; F17; F17C; F17C13/00; F17C2201/00; F17C2201/01; F17C2201/0104; F17C2201/0109; F17C2201/0119; F17C2203/00; F17C2203/06; F17C2203/0634; F17C2203/0636; F17C2203/0639; F17C2209/00; F17C2209/21; F17C2209/2181; F17C2209/23; F17C2209/234; F17C2209/236; F17C2221/00; F17C2221/01; F17C2221/013; F17C2223/00; F17C2223/01; F17C2223/0107; F17C2223/0123; F17C2223/013; F17C2260/00; F17C2260/01; Y; Y10; Y10S; Y10S220/00; Y10S220/22; Y10T; Y10T29/00; Y10T29/49; Y10T29/49826; Y10T29/49908; Y10T29/49925; Y10T29/49927; Y10T29/49929
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
No citation records indexed.
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1937-02-19 | 1937-08-21 | 1938-02-20 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1941-02-19 | 1941-08-21 | 1942-02-20 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1945-02-19 | 1945-08-21 | 1946-02-20 | $7700.00 | Window Closed / Lapsed |