Patent US2940981A successfully refreshed from Google Patents.
US2940981A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Method for isolating and crystallizing chlorophyll
Assignee: Martin Co
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Filing: 1958-07-14
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Granted: 1960-06-14
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Expires: 1978-07-14
Abstract
No abstract record available.
Inventors
- 👤 Hans J Trurnit
- 👤 Zill Leonard Peter
- 👤 Colmano Germille
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-07 15:05
CPC Classifications
C; C07; C07D; C07D487/00; C07D487/22
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
109 words
IN THE METHOD OF OBTAINING PURE CHLOROPHYLL FROM FRESH GREEN PLANT TISSUE COMPRISING THE STEPS OF EXTRACTING THE PIGMENTS FROM GREEN PLANT TISSUE WITH ACETONE, TRANSFERRING SAID PIGMENTS TO PETROLEUM ETHER WITH WATER, THEREBY FORMING A SUSPENDED PRECIPITATE OF CHLOROPHYLL IN SAID ETHER, MECHANICALLY SEPARATING SAID CHLOROPHYLL PRECIPITATE FROM SAID ETHER, AND PURIFYING THE CHLOROPHYLL SO SEPARATED, THE AFORESIDE STEPS BEING PERFORMED AT A TEMPERATURE SUFFICIENTLY LOW TO PREVENT OXIDATION OF THE CHLOROPHYLL, THE IMPROVEMENT COMPRISING THE STEP OF PURIFYING SAID CHLOROPHYLL BY WASHING SAME WITH FRESH PORTIONS OF PETROLEUM ETHER SO AS TO REMOVE PETROLEUM ETHER-SOLUBLE MATERIALS FROM SAID CHLOROPHYLL WHEREBY A MASS OF PURE CHLOROPHYLL IS OBTAINED.
Claim 2
Dependent Claim
109 words
IN THE METHOD OF OBTAINING PURE CHLOROPHYLL FROM FRESH GREEN PLANT TISSUE COMPRISING THE STEPS OF EXTRACTING THE PIGMENTS FROM GREEN PLANT TISSUE WITH ACETONE, TRANSFERRING SAID PIGMENTS TO PETROLEUM ETHER WITH WATER, THEREBY FORMING A SUSPENDED PRECIPITATE OF CHLOROPHYLL IN SAID ETHER, MECHANICALLY SEPARATING SAID CHLOROPHYLL PRECIPITATE FROM SAID ETHER, AND PURIFYING THE CHLOROPHYLL SO SEPARATED, THE AFORESIDE STEPS BEING PERFORMED AT A TEMPERATURE SUFFICIENTLY LOW TO PREVENT OXIDATION OF THE CHLOROPHYLL, THE IMPROVEMENT COMPRISING THE STEP OF PURIFYING SAID CHLOROPHYLL BY WASHING SAME WITH FRESH PORTIONS OF PETROLEUM ETHER SO AS TO REMOVE PETROLEUM ETHER-SOLUBLE MATERIALS FROM SAID CHLOROPHYLL WHEREBY A MASS OF PURE CHLOROPHYLL IS OBTAINED.
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) | 1963-06-14 | 1963-12-14 | 1964-06-14 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1967-06-14 | 1967-12-14 | 1968-06-14 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1971-06-14 | 1971-12-14 | 1972-06-14 | $7700.00 | Window Closed / Lapsed |