US3235324A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Boiler protection
Assignee: Dow Chemical Co
•
Filing: 1964-09-25
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Granted: 1966-02-15
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Expires: 1984-09-25
Abstract
No abstract record available.
Inventors
- 👤 Wayne R Merriman
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-30 23:03
CPC Classifications
F; F16; F16K; F16K3/00; F16K3/02; C; C02; C02F; C02F5/00; C02F5/08; C02F5/10; C02F5/12; C02F5/125; C23; C23F; C23F11/00; C23F11/08
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
109 words
IN A METHOD OF PROTECTING A STEAM BOILER, OF WHICH AT LEAST ONE OF THE FEED WATER AND THE BOILER WATER AT LEAST OCCASIONALLY CONTAINS POLYVALENT METAL SUBSTANCES THAT, IF UNTREATED, WOULD CONSTITUTE POLYVALENT METAL ION CONTAMINANTS, THE PROCESS WHICH COMPRISES, IN THE STATED SEQUENCE, THE STEPS OF INTRODUCING AN OXYGEN-SCAVENGING AMOUNT OF ALKALI METAL SULFITE INTO BOILER FEED WATER CONTAINING TRACES OF OXYGEN AND IN THE PRESENCE OF POLYVALENT METAL IONS SUFFICIENT TO CATALYZE REACTION OF ALKALI METAL SULFITE TO ALKALI METAL SULFATE, ALLOWING AN OXYGEN SCAVENGING REACTION TIME TO ELAPSE, AND THEREAFTER TO THE RESULTING FEED WATER ADDING AN AMOUNT OF A SODIUM SALT OF ETHYLENEDIAMINETETRAACETIC ACID.
Claim 2
Dependent Claim
109 words
IN A METHOD OF PROTECTING A STEAM BOILER, OF WHICH AT LEAST ONE OF THE FEED WATER AND THE BOILER WATER AT LEAST OCCASIONALLY CONTAINS POLYVALENT METAL SUBSTANCES THAT, IF UNTREATED, WOULD CONSTITUTE POLYVALENT METAL ION CONTAMINANTS, THE PROCESS WHICH COMPRISES, IN THE STATED SEQUENCE, THE STEPS OF INTRODUCING AN OXYGEN-SCAVENGING AMOUNT OF ALKALI METAL SULFITE INTO BOILER FEED WATER CONTAINING TRACES OF OXYGEN AND IN THE PRESENCE OF POLYVALENT METAL IONS SUFFICIENT TO CATALYZE REACTION OF ALKALI METAL SULFITE TO ALKALI METAL SULFATE, ALLOWING AN OXYGEN SCAVENGING REACTION TIME TO ELAPSE, AND THEREAFTER TO THE RESULTING FEED WATER ADDING AN AMOUNT OF A SODIUM SALT OF ETHYLENEDIAMINETETRAACETIC ACID.
References Cited (Backward Citations)
US2396938A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1969-02-14 | 1969-08-16 | 1970-02-15 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1973-02-14 | 1973-08-16 | 1974-02-15 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1977-02-14 | 1977-08-16 | 1978-02-15 | $7700.00 | Window Closed / Lapsed |