US3540746A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Combined split and segmental piston rings
Assignee: Sumitomo SHI Cryogenics of America Inc
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Filing: 1968-04-18
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Granted: 1970-11-17
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Expires: 1988-04-18
Abstract
No abstract record available.
Inventors
- 👤 Robert E Jepsen
- 👤 Richard E Luybli
- 👤 Harold R Sell
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-31 17:26
CPC Classifications
F; F16; F16J; F16J9/00; F16J9/08; Y; Y10; Y10S; Y10S277/00; Y10S277/935; Y10S277/936; Y10S277/944; Y10S277/945; Y10S277/946
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
No citation records indexed.
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1973-11-16 | 1974-05-18 | 1974-11-17 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1977-11-16 | 1978-05-18 | 1978-11-17 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1981-11-16 | 1982-05-18 | 1982-11-17 | $7700.00 | Window Closed / Lapsed |