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US3846469A
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US
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Isopropylidene bis(2,6-dihalo-p-phenylene) bis(poly-halophenyl) carbonates
Assignee: Dow Chemical Co
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Filing: 1972-06-12
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Granted: 1974-11-05
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Expires: 1992-06-12
Abstract
Abstract New organic compounds comprising isopropylidene bis(2,6-dihalop-phenylene)bis(polyhalophenyl)carbonates. These new compounds have demonstrated utility as fire retardant additives for various polymers.
Inventors
- 👤 J Gunsher
- 👤 R Pews
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-27 10:00
CPC Classifications
C; C07; C07C; C07C69/00; C07C69/96; C07C68/00; C07C68/02
Claims Analysis
Total Claims: 3
Claim 1
Independent Claim
6 words
A COMPOUND OF THE GENERAL FORMULA
Claim 2
Dependent Claim
6 words
A COMPOUND OF THE GENERAL FORMULA
Claim 3
Dependent Claim
9 words
A compound of claim 1 wherein m is 3.
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) | 1977-11-04 | 1978-05-06 | 1978-11-05 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1981-11-04 | 1982-05-06 | 1982-11-05 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1985-11-04 | 1986-05-06 | 1986-11-05 | $7700.00 | Window Closed / Lapsed |