Patent US3184516A successfully refreshed from Google Patents.
US3184516A
Expired / Lapsed
US
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Thiapyrans and their use in preparing polyenes
Assignee: Eastman Kodak Co
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Filing: 1960-07-27
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Granted: 1965-05-18
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Expires: 1980-07-27
Abstract
No abstract record available.
Inventors
- 👤 Albert J Chechak
- 👤 Charles D Robeson
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-08 23:07
CPC Classifications
C; C07; C07D; C07D407/00; C07D407/02; C07D407/04; C07C; C07C1/00; C07C1/32; C07C1/321; C07C1/322; C07C15/00; C07C15/40; C07C15/50; C07C403/00; C07C403/14; C07C403/24; C07C45/00; C07C45/27; C07C45/29; C07C45/298; C07C2601/00; C07C2601/12; C07C2601/16; Y; Y10; Y10S; Y10S585/00; Y10S585/929; Y10S585/93; Y10S585/934
Claims Analysis
Total Claims: 4
Claim 1
Independent Claim
24 words
THE PROCESS WHICH COMPRISES REACTING AT A TEMPERATURE IN THE RANGE OF -40*C. TO 15*C. HYDROGEN SULFIDE AND AN UNSATURATED ALDEHYDE HAVING THE FORMULA
Claim 2
Dependent Claim
24 words
THE PROCESS WHICH COMPRISES REACTING AT A TEMPERATURE IN THE RANGE OF -40*C. TO 15*C. HYDROGEN SULFIDE AND AN UNSATURATED ALDEHYDE HAVING THE FORMULA
Claim 3
Dependent Claim
32 words
THE PROCESS WHICH COPRISES REACTING VITAMIN A ALDEHYDE WITH HYDROGEN SULFIDE AT A DEPRESSED TEMPERATURE IN THE RANGE OF -40*C. TO 15*C. TO FORM A SULFURCONTAINING VITAMIN A DERIVATIVE HAVING THE FORMULA
Claim 4
Dependent Claim
32 words
THE PROCESS WHICH COPRISES REACTING VITAMIN A ALDEHYDE WITH HYDROGEN SULFIDE AT A DEPRESSED TEMPERATURE IN THE RANGE OF -40*C. TO 15*C. TO FORM A SULFURCONTAINING VITAMIN A DERIVATIVE HAVING THE FORMULA
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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) | 1968-05-17 | 1968-11-16 | 1969-05-18 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1972-05-17 | 1972-11-16 | 1973-05-18 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1976-05-17 | 1976-11-16 | 1977-05-18 | $7700.00 | Window Closed / Lapsed |