US3534856A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Valve assembly and self-cleansing brine well screen
Assignee: RAYTEC WATERGROUP COMPANY LP 800 MIRAMONTE DRIVE SANTA BARBARA
•
Filing: 1968-01-25
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Granted: 1970-10-20
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Expires: 1988-01-25
Abstract
No abstract record available.
Inventors
- 👤 Robert E Marsh
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-04 17:24
CPC Classifications
B; B01; B01J; B01J49/00; B01J49/75
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US3185302A
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US874418A
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US3040895A
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US2906285A
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GB936396A
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US3227524A
Cited
US3095005A
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US3146788A
Cited
US3202174A
Cited
US3374891A
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US3406829A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1973-10-19 | 1974-04-20 | 1974-10-20 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1977-10-19 | 1978-04-20 | 1978-10-20 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1981-10-19 | 1982-04-20 | 1982-10-20 | $7700.00 | Window Closed / Lapsed |