Patent US4725642A successfully refreshed from Google Patents.
Patent US3708328A successfully refreshed from Google Patents.
US3708328A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Fire-proofing of polyester fibers
Assignee: Hoechst AG
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Filing: 1971-02-12
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Granted: 1973-01-02
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Expires: 1991-02-12
Abstract
Abstract LINEAR POLYESTERS ARE RENDERED FLAME-PROOF BY CONTACTING THEM WITH PHOSPHORIC ACID-ALLYL-2,3-DIBROMOPROPYL ESTERS AND POLYMERIZING SAID ESERS ON THE SUBSTRATE BY A HEAT TREATMENT, OPTIONALLY WITH THE AID OF A FREE RADICAL GENERATOR.
Inventors
- 👤 W Kelkheim
- 👤 M Rieber
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-03 18:46
CPC Classifications
D; D06; D06M; D06M14/00; D06M14/08; D06M14/12; D06M14/14; D06M13/00; D06M13/244; D06M13/282; D06M13/292; D06M14/18; D06M15/00; D06M15/19; D06M15/21; D06M15/356; D06M15/3564; Y; Y10; Y10S; Y10S264/00; Y10S264/19; Y10S8/00; Y10S8/15; Y10T; Y10T428/00; Y10T428/29; Y10T428/2913; Y10T428/2933; Y10T428/2964; Y10T428/2967; Y10T428/2969
Claims Analysis
Total Claims: 0
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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) | 1976-01-02 | 1976-07-03 | 1977-01-02 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1980-01-02 | 1980-07-03 | 1981-01-02 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1984-01-02 | 1984-07-03 | 1985-01-02 | $7700.00 | Window Closed / Lapsed |