US3518032A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Compressor cylinder unloader
Assignee: Dresser Rand Co
•
Filing: 1968-05-24
•
Granted: 1970-06-30
•
Expires: 1988-05-24
Abstract
No abstract record available.
Inventors
- 👤 Richard C Degroff
- 👤 Thomas L King
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-28 08:41
CPC Classifications
F; F04; F04B; F04B39/00; F04B39/10; F04B49/00; F04B49/22; F04B49/24
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US770784A
Cited
US1291854A
Cited
US1948907A
Cited
US2751143A
Cited
US2831625A
Cited
US3076593A
Cited
US3294314A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1973-06-29 | 1973-12-29 | 1974-06-30 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1977-06-29 | 1977-12-29 | 1978-06-30 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1981-06-29 | 1981-12-29 | 1982-06-30 | $7700.00 | Window Closed / Lapsed |