Patent US2808302A successfully refreshed from Google Patents.
US2808302A
Expired / Lapsed
US
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Piston sealing means
Assignee: Individual
•
Filing: 1953-12-09
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Granted: 1957-10-01
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Expires: 1973-12-09
Abstract
No abstract record available.
Inventors
- 👤 Hulie E Bowerman
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-29 09:41
CPC Classifications
F; F16; F16J; F16J15/00; F16J15/16; F16J15/32; F16J15/3248; F16J15/3252; F04; F04B; F04B53/00; F04B53/14; F04B53/143
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US1273738A
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US1583955A
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US1833920A
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US2216291A
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US2450693A
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US2600516A
Cited
US2687335A
Cited
US2656229A
Cited
US2637606A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1960-09-30 | 1961-04-01 | 1961-10-01 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1964-09-30 | 1965-04-01 | 1965-10-01 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1968-09-30 | 1969-04-01 | 1969-10-01 | $7700.00 | Window Closed / Lapsed |