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US3491944A
Expired / Lapsed
US
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Pulsating linear pneumatic resistance element
Assignee: INST AVTOMATIKI I TELEMEKHANIK
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Filing: 1968-01-12
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Granted: 1970-01-27
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Expires: 1988-01-12
Abstract
No abstract record available.
Inventors
- 👤 Efrem Vladimirovich Fudim
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 05:01
CPC Classifications
F; F15; F15C; F15C1/00; F15C1/02; G; G06; G06G; G06G5/00
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US2979068A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1973-01-26 | 1973-07-28 | 1974-01-27 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1977-01-26 | 1977-07-28 | 1978-01-27 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1981-01-26 | 1981-07-28 | 1982-01-27 | $7700.00 | Window Closed / Lapsed |