US2807858A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Process of manufacturing synthetic pearl essence
Assignee: Argenta Products Co
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Filing: 1955-08-26
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Granted: 1957-10-01
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Expires: 1975-08-26
Abstract
No abstract record available.
Inventors
- 👤 Gideon E Livingston
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-27 14:46
CPC Classifications
C; C09; C09C; C09C1/00; C09C1/0015; C09C1/0018
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
98 words
THE PROCESS OF MANUFACTURING SYNTHETIC PEARL ESSENCE POSSESSING OPRICAL PROPERTIES APPROXIMATING THOSE OF NATURAL PEARL ESSENCE WHICH COMPRISES FORMING A SOLUTION OF NORMAL LEAD ACETATE HAVING A CONCENTRATION NO GREATER THAN 50%, MAINTAINING THE TEMPERATURE ABOVE ABOUT 50*C. AND NOT MORE THAN ABOUT 100*C., CONTROLLING THE PH OF THE SOLUTION ABOVE ABOUT 4.5 AND UP TO ABOUT 7.0 AND PASSING CARBON DIOXIDE GAS THROUGH SAID SOLUTION WHEREBY RELATIVELY LARGE AND LUSTROUS CRYSTALS OF LEAD CARBONATE ARE FORMED, AND REMOVING SAID CRYSTALS FROM THE SOLUTION AS SOON AS POSSIBLE AFTER THEY ARE FORMED TO PREVENT LUMPING DUE TO OVERCARBONATION.
Claim 2
Dependent Claim
98 words
THE PROCESS OF MANUFACTURING SYNTHETIC PEARL ESSENCE POSSESSING OPRICAL PROPERTIES APPROXIMATING THOSE OF NATURAL PEARL ESSENCE WHICH COMPRISES FORMING A SOLUTION OF NORMAL LEAD ACETATE HAVING A CONCENTRATION NO GREATER THAN 50%, MAINTAINING THE TEMPERATURE ABOVE ABOUT 50*C. AND NOT MORE THAN ABOUT 100*C., CONTROLLING THE PH OF THE SOLUTION ABOVE ABOUT 4.5 AND UP TO ABOUT 7.0 AND PASSING CARBON DIOXIDE GAS THROUGH SAID SOLUTION WHEREBY RELATIVELY LARGE AND LUSTROUS CRYSTALS OF LEAD CARBONATE ARE FORMED, AND REMOVING SAID CRYSTALS FROM THE SOLUTION AS SOON AS POSSIBLE AFTER THEY ARE FORMED TO PREVENT LUMPING DUE TO OVERCARBONATION.
References Cited (Backward Citations)
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1960-09-30 | 1961-04-01 | 1961-10-01 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1964-09-30 | 1965-04-01 | 1965-10-01 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1968-09-30 | 1969-04-01 | 1969-10-01 | $7700.00 | Window Closed / Lapsed |