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Patent US4743659A successfully refreshed from Google Patents.
US4743659A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Chemical modification of polydiacetylene crystals
Assignee: Verizon Laboratories Inc
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Filing: 1987-04-17
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Granted: 1988-05-10
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Expires: 2007-04-17
Abstract
Abstract Crystalline brominated poly-1,6-di-(N-carbazolyl)-2,4-hexadiyne having at least two bromine atoms per repeat unit is disclosed. The crystalline brominated poly-1,6-di-(N-carbazolyl)-2,4-hexadiyne of the invention is characterized by a Fourier transform infrared spectrum which includes absorption at 795±5, 835±5, and 865±5 cm -1 . A method for preparing the crystalline brominated poly-1,6-di-(N-carbazolyl)-2,4-hexadiyne of the invention is also disclosed.
Inventors
- 👤 Daniel J. Sandman
- 👤 Boris S. Elman
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-08 14:11
CPC Classifications
C; C08; C08F; C08F8/00; C08F8/18; C08F8/20; C08F8/22
Claims Analysis
Total Claims: 3
Claim 1
Independent Claim
73 words
A method for preparing crystalline brominated poly-1,6-di-(N-carbazolyl)-2,4-hexadiyne comprising contacting single crystals of poly-1,6-di-(N-carbazolyl)-2,4-hexadiyne with a mixture of liquid bromine and carbon tetrachloride, wherein the mixture contains from 70 to 100 weight percent liquid bromine, for a period of time sufficient to form crystalline brominated poly-1,6-di-(N-carbazolyl) -2,4-hexadiyne having at least two bromine atoms per repeat unit and characterized by a Fourier transform infrared spectrum including absorption at 795±5, 835±5, and 865±5 cm -1 .
Claim 2
Independent Claim
73 words
A method for preparing crystalline brominated poly-1,6-di-(N-carbazolyl)-2,4-hexadiyne comprising contacting single crystals of poly-1,6-di-(N-carbazolyl)-2,4-hexadiyne with a mixture of liquid bromine and carbon tetrachloride, wherein the mixture contains from 70 to 100 weight percent liquid bromine, for a period of time sufficient to form crystalline brominated poly-1,6-di-(N-carbazolyl) -2,4-hexadiyne having at least two bromine atoms per repeat unit and characterized by a Fourier transform infrared spectrum including absorption at 795±5, 835±5, and 865±5 cm -1 .
Claim 3
Dependent Claim
16 words
A method in accordance with claim 1 wherein the mixture contains 100 weight percent liquid bromine.
References Cited (Backward Citations)
JPS52151295A
Cited
US4125534A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1991-05-10 | 1991-11-09 | 1992-05-10 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1995-05-10 | 1995-11-09 | 1996-05-10 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1999-05-10 | 1999-11-09 | 2000-05-10 | $7700.00 | Window Closed / Lapsed |