US2998991A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Sealing rings
Assignee: Individual
•
Filing: 1957-10-25
•
Granted: 1961-09-05
•
Expires: 1977-10-25
Abstract
No abstract record available.
Inventors
- 👤 Harvey G Spencer
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-31 19:37
CPC Classifications
F; F16; F16J; F16J15/00; F16J15/44; F16J15/444; Y; Y10; Y10S; Y10S277/00; Y10S277/935; Y10S277/936; Y10S277/937; Y10S277/944; Y10S277/945; Y10S277/946; Y10S417/00; Y10S417/01
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US2301654A
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US2373443A
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US2459720A
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US2537230A
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US2539329A
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US2639198A
Cited
US2642370A
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US2731068A
Cited
US2750212A
Cited
US2907612A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1964-09-04 | 1965-03-06 | 1965-09-05 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1968-09-04 | 1969-03-06 | 1969-09-05 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1972-09-04 | 1973-03-06 | 1973-09-05 | $7700.00 | Window Closed / Lapsed |