Patent US2996525A successfully refreshed from Google Patents.
US2996525A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Chemical compounds and process for the preparation thereof
Assignee: 3M Co
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Filing: 1958-12-05
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Granted: 1961-08-15
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Expires: 1978-12-05
Abstract
No abstract record available.
Inventors
- 👤 William S Barnhart
- 👤 Robert H Wade
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-04 22:49
CPC Classifications
C; C07; C07C; C07C55/00; C07C55/36; C07C55/40; C07C51/00; C07C51/58; C07C51/60; C07C53/00; C07C53/38; C07C53/46; C07C53/50
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
43 words
AN ACID BROMIDE OF A PERCHLOROFLUOROCARBOXYLIC ACID SELECTED FROM THE GROUP CONSISTING OF Z1(CF2CFC1)N-1CF2COOH AND Z2CFC1(CF2CFC1)N-2CF2COOH IN WHICH N IS AN INTEGER FROM 2 TO 16, AND Z1 ANS Z2 ARE SELECTED FROM THE GROUP CONSISTING OF CHLORINE AND A CARBOXYOIC ACID RADICAL.
Claim 2
Dependent Claim
23 words
AN ACID BROMIDE OF A PERCHLOROFLUORODICARBOXYLIC ACID, SAID ACID HAVING THE STRUCTURE HOOC-CFC1(CF2-CF1)N-2CF2COOH IN WHICH N IS AN INTEGER FROM 2 TO 16.
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) | 1964-08-14 | 1965-02-13 | 1965-08-15 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1968-08-14 | 1969-02-13 | 1969-08-15 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1972-08-14 | 1973-02-13 | 1973-08-15 | $7700.00 | Window Closed / Lapsed |