Patent US2811617A successfully refreshed from Google Patents.
US2560092A
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Sealing means for bolted storage tanks
Assignee: Parkersburg Rig and Reel Co
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Filing: 1948-02-17
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Granted: 1951-07-10
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Expires: 1968-02-17
Abstract
No abstract record available.
Inventors
- 👤 Mater Robert Griffin De La
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 16:10
CPC Classifications
B; B65; B65D; B65D90/00; B65D90/02; B65D90/08; F; F16; F16B; F16B2200/00; F16B2200/60; Y; Y10; Y10S; Y10S411/00; Y10S411/915; Y10T; Y10T29/00; Y10T29/49; Y10T29/49826; Y10T29/49863; Y10T29/4987; Y10T29/49872; Y10T29/49876; Y10T29/49888
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) | 1954-07-09 | 1955-01-08 | 1955-07-10 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1958-07-09 | 1959-01-08 | 1959-07-10 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1962-07-09 | 1963-01-08 | 1963-07-10 | $7700.00 | Window Closed / Lapsed |