US3515646A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Vertical multi-stage flash evaporator with separate horizontal condensing chamber
Assignee: VWS Westgarth Ltd
•
Filing: 1967-04-20
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Granted: 1970-06-02
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Expires: 1987-04-20
Abstract
No abstract record available.
Inventors
- 👤 Peter Thomas Walker
- 👤 Ivan Henry Newson
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-04 14:56
CPC Classifications
C; C02; C02F; C02F1/00; C02F1/02; C02F1/04; C02F1/06; B; B01; B01D; B01D3/00; B01D3/06; B01D3/065; Y; Y02; Y02A; Y02A20/00; Y02A20/124
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US1524184A
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US2750999A
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US2759882A
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US3257290A
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US3249517A
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US3356592A
Cited
US3303106A
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US3360442A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1973-06-01 | 1973-12-01 | 1974-06-02 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1977-06-01 | 1977-12-01 | 1978-06-02 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1981-06-01 | 1981-12-01 | 1982-06-02 | $7700.00 | Window Closed / Lapsed |