Patent US3498052A successfully refreshed from Google Patents.
US3498052A
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US
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Regenerative compound engine
Assignee: Dresser Rand Co
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Filing: 1968-07-29
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Granted: 1970-03-03
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Expires: 1988-07-29
Abstract
No abstract record available.
Inventors
- 👤 David H Silvern
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-31 07:21
CPC Classifications
F; F02; F02B; F02B37/00; F02B37/02; F02B25/00; F02B37/013; F02B75/00; F02B75/02; F02B2075/022; F02B2075/025; F02B2700/00; F02B2700/03; F02B2700/034; F02B2700/037; Y; Y02; Y02T; Y02T10/00; Y02T10/10; Y02T10/12
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) | 1973-03-02 | 1973-09-01 | 1974-03-03 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1977-03-02 | 1977-09-01 | 1978-03-03 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1981-03-02 | 1981-09-01 | 1982-03-03 | $7700.00 | Window Closed / Lapsed |