Patent US2715097A successfully refreshed from Google Patents.
Patent US3385735A successfully refreshed from Google Patents.
US3385735A
Expired / Lapsed
US
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Method for cleaning hydraulic systems
Assignee: Newport News Shipbuilding and Dry Dock Co
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Filing: 1962-11-15
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Granted: 1968-05-28
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Expires: 1982-11-15
Abstract
No abstract record available.
Inventors
- 👤 Thomas V Brabrand
- 👤 Richard J Baumler
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 21:38
CPC Classifications
B; B08; B08B; B08B9/00; B08B9/02; B08B9/027; B08B9/032; B08B9/0321; B01; B01D; B01D37/00; B08B3/00; F; F15; F15B; F15B21/00; F15B21/005; F15B21/04; F15B21/041; Y; Y10; Y10T; Y10T137/00; Y10T137/0318; Y10T137/0402; Y10T137/0419; Y10T137/0424; Y10T137/4238
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
138 words
THE METHOD OF CLEANING HYDRAULIC SYSTEMS COMPRISING DEGREASING THE SYSTEM BY CIRCULATING A FIRST NON-ACID CLEANING SOLUTION THROUGH THE SYSTEM, INTRODUCING FRESH FILTERED WATER INTO THE SYSTEM TO DISPLACE THE CLEANING SOLUTION AND RINSING OUT THE SYSTEM, DRAINING SAID WATER FROM THE SYSTEM, BLOWING THE SYSTEM DRY WITH HEATED GAS, THEN REMOVING SCALE AND MIX BY CIRCULATING A MILD ACID SOLUTION THROUGH THE SYSTEM, THEN INTRODUCING FILTERED WATER AGAIN INTO THE SYSTEM TO DISPLACE SAID ACID SOLUTION AND RINSING SAID SYSTEM, THEN INTRODUCING A SECOND NONACID CLEANING SOLUTION INTO THE SYSTEM AND CIRCULATING SAID CLEANING SOLUTION IN ALTERNATE DIRECTIONS AT CERTAIN TIME INTERVALS FOR PRODUCING A BI-DIRECTIONAL FLUSH, INTERMITTENTLY INTRODUCING INJECTIONS OF GAS INTO THE CIRCULATING LIQUID DURING SAID BI-DIRECTIONAL FLUSH, AND FURTHER DURING THE BI-DIRECTIONAL FLUSH AT CERTAIN INTERVALS ALTERNATELY STOPPING THE CLEANING SOLUTION FLOW WHILE SIMULTANEOUSLY
Claim 2
Independent Claim
138 words
THE METHOD OF CLEANING HYDRAULIC SYSTEMS COMPRISING DEGREASING THE SYSTEM BY CIRCULATING A FIRST NON-ACID CLEANING SOLUTION THROUGH THE SYSTEM, INTRODUCING FRESH FILTERED WATER INTO THE SYSTEM TO DISPLACE THE CLEANING SOLUTION AND RINSING OUT THE SYSTEM, DRAINING SAID WATER FROM THE SYSTEM, BLOWING THE SYSTEM DRY WITH HEATED GAS, THEN REMOVING SCALE AND MIX BY CIRCULATING A MILD ACID SOLUTION THROUGH THE SYSTEM, THEN INTRODUCING FILTERED WATER AGAIN INTO THE SYSTEM TO DISPLACE SAID ACID SOLUTION AND RINSING SAID SYSTEM, THEN INTRODUCING A SECOND NONACID CLEANING SOLUTION INTO THE SYSTEM AND CIRCULATING SAID CLEANING SOLUTION IN ALTERNATE DIRECTIONS AT CERTAIN TIME INTERVALS FOR PRODUCING A BI-DIRECTIONAL FLUSH, INTERMITTENTLY INTRODUCING INJECTIONS OF GAS INTO THE CIRCULATING LIQUID DURING SAID BI-DIRECTIONAL FLUSH, AND FURTHER DURING THE BI-DIRECTIONAL FLUSH AT CERTAIN INTERVALS ALTERNATELY STOPPING THE CLEANING SOLUTION FLOW WHILE SIMULTANEOUSLY
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USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1971-05-28 | 1971-11-27 | 1972-05-28 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1975-05-28 | 1975-11-27 | 1976-05-28 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1979-05-28 | 1979-11-27 | 1980-05-28 | $7700.00 | Window Closed / Lapsed |