US2658926A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Chlorinated polycyclic compounds
Assignee: Shell Development Co
•
Filing: 1948-08-21
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Granted: 1953-11-10
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Expires: 1968-08-21
Abstract
No abstract record available.
Inventors
- 👤 Hyman Julius
- 👤 Abe A Danish
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-06 05:53
CPC Classifications
C; C07; C07D; C07D307/00; C07D307/77; C07D307/93; C07C; C07C17/00; C07C17/26; C07C17/30; C07C23/00; C07C23/18
Claims Analysis
Total Claims: 4
Claim 1
Independent Claim
47 words
A DIELS-ALDER ADDUCT REPRESENTING AT LEAST ONE MOLE OF HEXACHLOROCYCLOPENTADIENE, BUT NOT OVER TWO MOLES, REACTED WITH ONE MOLE OF A MEMBER OF THE GROUP CONSISTING OF NAPHTHALENE AND ANTHRACENE, THE SAID ADDUCTS BEING SELECTED FROM THE GROUP CONSISTING OF (1) THE COMPOUND REPRESENTED BY THE FORMULA:
Claim 2
Dependent Claim
47 words
A DIELS-ALDER ADDUCT REPRESENTING AT LEAST ONE MOLE OF HEXACHLOROCYCLOPENTADIENE, BUT NOT OVER TWO MOLES, REACTED WITH ONE MOLE OF A MEMBER OF THE GROUP CONSISTING OF NAPHTHALENE AND ANTHRACENE, THE SAID ADDUCTS BEING SELECTED FROM THE GROUP CONSISTING OF (1) THE COMPOUND REPRESENTED BY THE FORMULA:
Claim 3
Dependent Claim
59 words
THE PROCESS OF FORMING A DIELS-ALDER SYNTHESIS PRODUCT INVOLVING DIRECT ATTACHMENT OF AN AROMATIC RING WHICH ACTS AS A DIENOPHILE, WHICH COMPRISES REACTING HEXACHLOROCYCLOPENTADIENE WITH A MEMBER OF THE GROUP CONSISTING OF NAPHTHALENE AND ANTRACENE, BY HEATING SAID REACTANTS AT A TEMPERATURE FROM ABOUT 50* C. TO ABOUT 200* C. FOR A PERIOD OF ABOUT 10 TO 300 HOURS.
Claim 4
Dependent Claim
59 words
THE PROCESS OF FORMING A DIELS-ALDER SYNTHESIS PRODUCT INVOLVING DIRECT ATTACHMENT OF AN AROMATIC RING WHICH ACTS AS A DIENOPHILE, WHICH COMPRISES REACTING HEXACHLOROCYCLOPENTADIENE WITH A MEMBER OF THE GROUP CONSISTING OF NAPHTHALENE AND ANTRACENE, BY HEATING SAID REACTANTS AT A TEMPERATURE FROM ABOUT 50* C. TO ABOUT 200* C. FOR A PERIOD OF ABOUT 10 TO 300 HOURS.
References Cited (Backward Citations)
US2179809A
Cited
US2606910A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1956-11-09 | 1957-05-11 | 1957-11-10 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1960-11-09 | 1961-05-11 | 1961-11-10 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1964-11-09 | 1965-05-11 | 1965-11-10 | $7700.00 | Window Closed / Lapsed |