US2558030A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Noninflammable hydraulic fluids and lubricants
Assignee: Individual
•
Filing: 1948-09-23
•
Granted: 1951-06-26
•
Expires: 1968-09-23
Abstract
No abstract record available.
Inventors
- 👤 William A Zisman
- 👤 Dwight R Spessard
- 👤 Jacques G O'rear
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 19:25
CPC Classifications
C; C10; C10M; C10M173/00; C10M173/02; C10M2201/00; C10M2201/02; C10M2201/085; C10M2207/00; C10M2207/02; C10M2207/021; C10M2207/022; C10M2207/04; C10M2209/00; C10M2209/02; C10M2209/08; C10M2209/084; C10M2209/10; C10M2209/103; C10M2209/104; C10M2215/00; C10M2215/02; C10M2215/04; C10M2215/042; C10M2215/044; C10M2215/06; C10M2215/14; C10M2215/24; C10M2215/26; C10M2219/00; C10M2219/10; C10M2219/102; C10M2219/104; C10M2219/106; C10N; C10N2020/00; C10N2020/01; C10N2040/00; C10N2040/08; C10N2050/00; C10N2050/01
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
145 words
A NON-INFLAMMABLE HYDRAULIC FLUID CONSISTING ESSENTIALLY OF FROM ABOUT 30% TO ABOUT 50% BY WEIGHT WATER, FROM ABOUT 30% TO ABOUT 55% BY WEIGHT OF A FREEZING POINT DEPRESSANT SELECTED FROM THE GROUP CONSISTING OF GLYCOLS AND GLYCOL ETHERS HAVING FROM 2 TO 14 CARBON ATOMS, FROM ABOUT 4.5% TO ABOUT 25% BY WEIGHT OF A POLYALKYLENE GLYCOL COPOLYMER HAVING AN AVERAGE MOLECULAR WEIGHT OF FROM ABOUT 15,000 TO ABOUT 20,000, FROM ABOUT 0.7% TO ABOUT 2% BY WEIGHT OF DIAMYLAMMONIUM LAURATE, FROM ABOUT 0.3% TO ABOUT 15% BY WEIGHT ETHYLENE GLYCOL MONOBUTYL ETHER, FROM ABOUT 1% TO ABOUT 2% BY WEIGHT OF A VAPOR PHASE INHIBITOR SELECTED FROM THE GROUP CONSISTING OF DIISOPROPYL AMMONIUM NITRITE, DIISOBUTYL AMMONIUM NITRITE AND DICYCLOHEXYL AMMONIUM NITRITE, FROM ABOUT 0.1% TO ABOUT 0.3% BY WEIGHT OF SODIUM MERCAPTOBENZOTHIAZOLE AND FROM ABOUT 0.1% TO ABOUT 1% BY WEIGHT OF SALICYLALETHANOLAMINE.
Claim 2
Dependent Claim
145 words
A NON-INFLAMMABLE HYDRAULIC FLUID CONSISTING ESSENTIALLY OF FROM ABOUT 30% TO ABOUT 50% BY WEIGHT WATER, FROM ABOUT 30% TO ABOUT 55% BY WEIGHT OF A FREEZING POINT DEPRESSANT SELECTED FROM THE GROUP CONSISTING OF GLYCOLS AND GLYCOL ETHERS HAVING FROM 2 TO 14 CARBON ATOMS, FROM ABOUT 4.5% TO ABOUT 25% BY WEIGHT OF A POLYALKYLENE GLYCOL COPOLYMER HAVING AN AVERAGE MOLECULAR WEIGHT OF FROM ABOUT 15,000 TO ABOUT 20,000, FROM ABOUT 0.7% TO ABOUT 2% BY WEIGHT OF DIAMYLAMMONIUM LAURATE, FROM ABOUT 0.3% TO ABOUT 15% BY WEIGHT ETHYLENE GLYCOL MONOBUTYL ETHER, FROM ABOUT 1% TO ABOUT 2% BY WEIGHT OF A VAPOR PHASE INHIBITOR SELECTED FROM THE GROUP CONSISTING OF DIISOPROPYL AMMONIUM NITRITE, DIISOBUTYL AMMONIUM NITRITE AND DICYCLOHEXYL AMMONIUM NITRITE, FROM ABOUT 0.1% TO ABOUT 0.3% BY WEIGHT OF SODIUM MERCAPTOBENZOTHIAZOLE AND FROM ABOUT 0.1% TO ABOUT 1% BY WEIGHT OF SALICYLALETHANOLAMINE.
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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) | 1954-06-25 | 1954-12-25 | 1955-06-26 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1958-06-25 | 1958-12-25 | 1959-06-26 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1962-06-25 | 1962-12-25 | 1963-06-26 | $7700.00 | Window Closed / Lapsed |