Patent US2610193A successfully refreshed from Google Patents.
US2610193A
Expired / Lapsed
US
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Cyclic organic compounds
Assignee: Shell Development Co
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Filing: 1949-07-01
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Granted: 1952-09-09
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Expires: 1969-07-01
Abstract
No abstract record available.
Inventors
- 👤 Richard R Whetstone
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 23:38
CPC Classifications
C; C07; C07D; C07D309/00; C07D309/16; C07D309/20; C07D309/22
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
22 words
AS A NEW CHEMICAL COMPOUND, A MEMBER OF THE CLASS CONSISTING OF (1) THE DIHYDROPYRAN DERIVATIVES HAVING STRUCTURES CORRESPONDING TO THE FORMULA
Claim 2
Dependent Claim
22 words
AS A NEW CHEMICAL COMPOUND, A MEMBER OF THE CLASS CONSISTING OF (1) THE DIHYDROPYRAN DERIVATIVES HAVING STRUCTURES CORRESPONDING TO THE FORMULA
References Cited (Backward Citations)
FR913941A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1955-09-09 | 1956-03-10 | 1956-09-09 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1959-09-09 | 1960-03-10 | 1960-09-09 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1963-09-09 | 1964-03-10 | 1964-09-09 | $7700.00 | Window Closed / Lapsed |