Patent US3337644A successfully refreshed from Google Patents.
US3337644A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Selected fluorinated glycols
Assignee: EIDP Inc
•
Filing: 1965-12-14
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Granted: 1967-08-22
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Expires: 1985-12-14
Abstract
No abstract record available.
Inventors
- 👤 John J Drysdale
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 11:14
CPC Classifications
C; C07; C07C; C07C31/00; C07C31/34
Claims Analysis
Total Claims: 3
Claim 1
Independent Claim
5 words
A COMPOUND OF THE FORMULA
Claim 2
Dependent Claim
5 words
A COMPOUND OF THE FORMULA
Claim 3
Dependent Claim
17 words
THE COMPOUND OF CLAIM 1 IN WHICH R1 AND R2 ARE PERFLUOROPROPYL, SAID COMPOUND BEING 4H, 5H-TETRADECAFLUORO-4,5-OCTANEDIOL.
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) | 1970-08-21 | 1971-02-20 | 1971-08-22 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1974-08-21 | 1975-02-20 | 1975-08-22 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1978-08-21 | 1979-02-20 | 1979-08-22 | $7700.00 | Window Closed / Lapsed |