Patent US1337872A successfully refreshed from Google Patents.
US2698544A
Expired / Lapsed
US
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Shaft sealing means
Assignee: Black Sivalls and Bryson Inc
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Filing: 1952-04-17
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Granted: 1955-01-04
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Expires: 1972-04-17
Abstract
No abstract record available.
Inventors
- 👤 Albert J Hanssen
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-28 13:05
CPC Classifications
F; F16; F16J; F16J15/00; F16J15/50; F16J15/52; Y; Y10; Y10T; Y10T137/00; Y10T137/7287; Y10T137/7358; Y10T137/7439
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US769092A
Cited
US2248322A
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US2263771A
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US2376473A
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US2542769A
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US2599159A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1958-01-03 | 1958-07-05 | 1959-01-04 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1962-01-03 | 1962-07-05 | 1963-01-04 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1966-01-03 | 1966-07-05 | 1967-01-04 | $7700.00 | Window Closed / Lapsed |