US3839460A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Cyclopropenylium salts
Assignee: STWB Inc
•
Filing: 1972-08-16
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Granted: 1974-10-01
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Expires: 1992-08-16
Abstract
Abstract 1. A COMPOUND HAVING THE FORMULA 1-R1,2-R2,3-R3-CYCLOPROPENYLIUM X(-) WHERE R1 AND R2 ARE EACH T-BUTYL OR 1-ADAMANTYL; R3 IS 1ADAMANTYL-LOWER-ALKYL, PHENYL OR 1-ADAMANTYL; X- IS TETRAFLUOROBORATE, AND WHERE R3 AS PHENYL IS EITHER UNSUBSTITUTED OR IS SUBSTITUTED BY FROM ONE TO THREE LOWERALKYLS.
Inventors
- 👤 J Schulenberg
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-02 23:02
CPC Classifications
C; C07; C07C; C07C49/00; C07C49/04; C07C45/00; C07C45/004
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
5 words
A COMPOUND HAVING THE FORMULA
Claim 2
Dependent Claim
5 words
A COMPOUND HAVING THE FORMULA
References Cited (Backward Citations)
No citation records indexed.
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1977-09-30 | 1978-04-01 | 1978-10-01 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1981-09-30 | 1982-04-01 | 1982-10-01 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1985-09-30 | 1986-04-01 | 1986-10-01 | $7700.00 | Window Closed / Lapsed |