Patent US3043802A successfully refreshed from Google Patents.
US3043802A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Light-sensitive high molecular polycarbonates
Assignee: Bayer AG
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Filing: 1959-08-17
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Granted: 1962-07-10
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Expires: 1979-08-17
Abstract
No abstract record available.
Inventors
- 👤 Thoma Wilhelm
- 👤 Rinke Heinrich
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-26 21:26
CPC Classifications
C; C08; C08G; C08G64/00; C08G64/16; C08G64/1691; C08G64/04; C08G64/045; G; G03; G03F; G03F7/00; G03F7/004; G03F7/038; G03F7/0384
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
77 words
IN THE PROCESS OF MAKING ORGANIC POLYCARBONATES BY REACTING A MEMBER SELECTED FROM THE GROUP CONSISTING OF ORGANIC BIS-PHENOLS AND THEIR BIS-HYDROXY ALKYL ETHERS WITH A MEMBER SELECTED FROM THE GROUP CONSISTING OF PHOSGENE AND DIPHENYL CARBONATE, THE IMPROVEMENT OF MAKING A LIGHT-SNESITIVE ORGANIC POLYCARBONATE WHEREIN A MEMBER SELECTED FROM THE GROUP CONSISTING OF ORGANIC BIS-PHENOLS AND THEIR BIS-HYDROXY ALKYL ETHERS, CONTAINING AT LEAST ONE -CH=CH-CO GROUP IN THE CHAIN CONNECTING THE TWO PHENYLENE GROUPS IS EMPLOYED.
Claim 2
Dependent Claim
77 words
IN THE PROCESS OF MAKING ORGANIC POLYCARBONATES BY REACTING A MEMBER SELECTED FROM THE GROUP CONSISTING OF ORGANIC BIS-PHENOLS AND THEIR BIS-HYDROXY ALKYL ETHERS WITH A MEMBER SELECTED FROM THE GROUP CONSISTING OF PHOSGENE AND DIPHENYL CARBONATE, THE IMPROVEMENT OF MAKING A LIGHT-SNESITIVE ORGANIC POLYCARBONATE WHEREIN A MEMBER SELECTED FROM THE GROUP CONSISTING OF ORGANIC BIS-PHENOLS AND THEIR BIS-HYDROXY ALKYL ETHERS, CONTAINING AT LEAST ONE -CH=CH-CO GROUP IN THE CHAIN CONNECTING THE TWO PHENYLENE GROUPS IS EMPLOYED.
References Cited (Backward Citations)
GB772627A
Cited
US2816091A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1965-07-09 | 1966-01-08 | 1966-07-10 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1969-07-09 | 1970-01-08 | 1970-07-10 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1973-07-09 | 1974-01-08 | 1974-07-10 | $7700.00 | Window Closed / Lapsed |