US3533446A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Fluid-operable device including a piston for controlling flow through a pair of ports
Assignee: Martonair Ltd
•
Filing: 1969-03-27
•
Granted: 1970-10-13
•
Expires: 1989-03-27
Abstract
No abstract record available.
Inventors
- 👤 Colin John Kirk
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-27 19:40
CPC Classifications
G; G05; G05D; G05D11/00; G05D11/003; F; F15; F15B; F15B11/00; F15B11/08; F15B13/00; F15B13/02; F15B13/04; F15B13/0401; F15B13/0402; F16; F16K; F16K11/00; F16K11/02; F16K11/04; F16K11/044; Y; Y10; Y10T; Y10T137/00; Y10T137/8593; Y10T137/86493; Y10T137/86574; Y10T137/86622; Y10T137/8663
Claims Analysis
Total Claims: 0
No claims parsed yet. Click Sync Now above to re-index claims from Google Patents.
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) | 1973-10-12 | 1974-04-13 | 1974-10-13 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1977-10-12 | 1978-04-13 | 1978-10-13 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1981-10-12 | 1982-04-13 | 1982-10-13 | $7700.00 | Window Closed / Lapsed |