US2969248A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Shaft seal
Assignee: National Gypsum Co
•
Filing: 1957-04-19
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Granted: 1961-01-24
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Expires: 1977-04-19
Abstract
No abstract record available.
Inventors
- 👤 Walter V Sulkowski
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-25 15:08
CPC Classifications
F; F16; F16J; F16J15/00; F16J15/54; Y; Y10; Y10S; Y10S277/00; Y10S277/931; Y10S277/933; Y10S277/935
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) | 1964-01-24 | 1964-07-25 | 1965-01-24 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1968-01-24 | 1968-07-25 | 1969-01-24 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1972-01-24 | 1972-07-25 | 1973-01-24 | $7700.00 | Window Closed / Lapsed |