Patent US4631244A successfully refreshed from Google Patents.
Patent US4745215A successfully refreshed from Google Patents.
US4745215A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Fluorine containing dicyanate resins
Assignee: International Business Machines Corp
•
Filing: 1987-04-03
•
Granted: 1988-05-17
•
Expires: 2007-04-03
Abstract
Abstract 4,4'-(Hexafluoroisopropylidene) bisphonol dicyanate and related compounds have reduced dielectric constant, reduced moisture absorption, and increase Tg making such compounds especially suitable for various electronic applications, such as circuit packaging or in forming prepregs and circuit boards.
Inventors
- 👤 Robert J. Cox
- 👤 William J. Summa
- 👤 David W. Wang
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-26 22:12
CPC Classifications
C; C07; C07C; C07C261/00; C07C261/02; H; H05; H05K; H05K1/00; H05K1/02; H05K1/03; H05K1/0313; H05K1/032; H05K1/034; Y; Y10; Y10T; Y10T428/00; Y10T428/31504; Y10T428/31547
Claims Analysis
Total Claims: 6
Claim 1
Independent Claim
53 words
A compound of the formula ##STR5## wherein each R group is independently selected from hydrogen, alkyl with 1 to about 8 carbon atoms, alkenyl with 2 to about 8 carbon atoms, aryl or alkaryl with 6 to about 12 carbon atoms, and halogen, and n is an integer from 0 to about 4.
Claim 2
Dependent Claim
53 words
A compound of the formula ##STR5## wherein each R group is independently selected from hydrogen, alkyl with 1 to about 8 carbon atoms, alkenyl with 2 to about 8 carbon atoms, aryl or alkaryl with 6 to about 12 carbon atoms, and halogen, and n is an integer from 0 to about 4.
Claim 3
Dependent Claim
13 words
The compound of claim 1 wherein all of the R groups are hydrogen.
Claim 4
Dependent Claim
15 words
The compound of claim 1 wherein n is an integer selected from 0 and 1.
Claim 5
Dependent Claim
17 words
The compound of claim 1 wherein all of the R groups are hydrogen and n is 0.
Claim 6
Dependent Claim
17 words
The compound of claim 1 wherein all of the R groups are hydrogen and n is 1.
References Cited (Backward Citations)
US3180883A
Cited
US3294713A
Cited
US3707486A
Cited
US3681292A
Cited
US3829460A
Cited
US4477629A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1991-05-17 | 1991-11-16 | 1992-05-17 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1995-05-17 | 1995-11-16 | 1996-05-17 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1999-05-17 | 1999-11-16 | 2000-05-17 | $7700.00 | Window Closed / Lapsed |