Patent US812411A successfully refreshed from Google Patents.
Patent US3587970A successfully refreshed from Google Patents.
US3587970A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Fluid injectors
Assignee: Spectus Energy Ltd
•
Filing: 1969-04-01
•
Granted: 1971-06-28
•
Expires: 1989-04-01
Abstract
Abstract THE INVENTION COMPRISES A FLUID INJECTOR INCLUDING A CHANGEOVER VALVE SELECTIVELY MOVABLE INTO ONE POSITION IN WHICH TO CONDITION THE INJECTOR FOR FLUID DISCHARGE AND INTO ANOTHER POSITION IN WHICH THE INJECTOR IS CONNECTED FOR NONDISCHARGE BUT CONDITIONED TO ACCEPT A CONTINUOUS CIRCULATION OF FLUID THROUGH ITSELF WHEN IN SAID NONDISCHARGE CONDITION.
Inventors
- 👤 David Tindall
- 👤 Arthur Michael Needham
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-31 15:10
CPC Classifications
F; F23; F23D; F23D11/00; F23D11/24; F23D11/26; F23D11/28
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) | 1974-06-27 | 1974-12-27 | 1975-06-28 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1978-06-27 | 1978-12-27 | 1979-06-28 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1982-06-27 | 1982-12-27 | 1983-06-28 | $7700.00 | Window Closed / Lapsed |