Patent US6007573A successfully refreshed from Google Patents.
Patent US2478818A successfully refreshed from Google Patents.
US2478818A
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US
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Method of manufacturing pressure cylinders
Assignee: HPM Development Corp
•
Filing: 1945-08-11
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Granted: 1949-08-09
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Expires: 1965-08-11
Abstract
No abstract record available.
Inventors
- 👤 George M Geiger
- 👤 Harold A Donnenwirth
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 11:18
CPC Classifications
F; F16; F16J; F16J10/00; F16J10/02; F15; F15B; F15B15/00; F15B15/20; F15B15/22; F15B15/222; Y; Y10; Y10T; Y10T29/00; Y10T29/49; Y10T29/49229; Y10T29/4927
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) | 1952-08-08 | 1953-02-07 | 1953-08-09 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1956-08-08 | 1957-02-07 | 1957-08-09 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1960-08-08 | 1961-02-07 | 1961-08-09 | $7700.00 | Window Closed / Lapsed |