Patent US2929531A successfully refreshed from Google Patents.
US2929531A
Expired / Lapsed
US
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Seal for pressure vessel doors
Assignee: Blaw Knox Co
•
Filing: 1958-04-28
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Granted: 1960-03-22
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Expires: 1978-04-28
Abstract
No abstract record available.
Inventors
- 👤 William D Kohlins
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-07 15:58
CPC Classifications
F; F16; F16J; F16J15/00; F16J15/02; F16J15/06; F16J15/10; F16J15/104; F16J15/106; B; B01; B01J; B01J3/00; B01J3/03; Y; Y10; Y10S; Y10S277/00; Y10S277/921; Y10S277/93
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) | 1963-03-22 | 1963-09-21 | 1964-03-22 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1967-03-22 | 1967-09-21 | 1968-03-22 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1971-03-22 | 1971-09-21 | 1972-03-22 | $7700.00 | Window Closed / Lapsed |