US3849504A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Perfluoropolyethers and process for making
Assignee: 3M Co
•
Filing: 1968-09-27
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Granted: 1974-11-19
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Expires: 1988-09-27
Abstract
Abstract 1. POLYPERFLUOROALKYLENE OXIDES HAVING MOLECULAR WEIGHTS IN THE RANGE OF 500 TO 15,000, CARBON-TO-OXYGEN BACKBONE RATIOS FROM 2:1 TO 20:1, AN AVERAGE OF 2.1 TO 5 METHYLOL END GROUPS, AND BACKBONES CONSISTING OF REPEATING UNITS OF THE STRUCTURE &CMF2M$O$CNF2N$ WHERE M AND N ARE INTEGERS OF 1 TO 7, AND ONE OR MORE RANDOMLY DISTRIBUTED BRANCHED UNITS OF THE STRUCTURE >CF-O-R- WHERE R IS A SIDE CHAIN MADE OF THE REPEATING UNITS OF SAID STRUCTURE I.
Inventors
- 👤 R Mitsch
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-26 17:12
CPC Classifications
C; C07; C07C; C07C43/00; C07C43/02; C07C43/03; C07C43/04; C07C43/12; C07C43/126; C08; C08G; C08G65/00; C08G65/002; C08G65/005; C08G65/007; Y; Y10; Y10S; Y10S528/00; Y10S528/905
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
37 words
POLYPERFLUOROALKYLENE OXIDES HAVING MOLECULAR WEIGHTS IN THE RANGE OF 500 TO 15,000, CARBON-TO-OXYGEN BACKBONE RATIOS FROM 2:1 TO 20:1, AN AVERAGE OF 2.1 TO 5 METHYLOL END GROUPS, AND BACKBONES CONSISTING OF REPEATING UNITS OF THE STRUCTURE
Claim 2
Dependent Claim
37 words
POLYPERFLUOROALKYLENE OXIDES HAVING MOLECULAR WEIGHTS IN THE RANGE OF 500 TO 15,000, CARBON-TO-OXYGEN BACKBONE RATIOS FROM 2:1 TO 20:1, AN AVERAGE OF 2.1 TO 5 METHYLOL END GROUPS, AND BACKBONES CONSISTING OF REPEATING UNITS OF THE STRUCTURE
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) | 1977-11-18 | 1978-05-20 | 1978-11-19 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1981-11-18 | 1982-05-20 | 1982-11-19 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1985-11-18 | 1986-05-20 | 1986-11-19 | $7700.00 | Window Closed / Lapsed |