US3306873A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Process for the production of filaments or films by shaping linear polycarbonates of high molecular weight
Assignee: Bayer AG
•
Filing: 1964-03-31
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Granted: 1967-02-28
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Expires: 1984-03-31
Abstract
No abstract record available.
Inventors
- 👤 Falkai Bela Von
- 👤 Prietzschk Artur
- 👤 Rellensmann Wolfgang
- 👤 Reichle Alfred
- 👤 Wieden Horst
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-25 21:05
CPC Classifications
D; D01; D01F; D01F6/00; D01F6/58; D01F6/62; D01F6/64; C; C08; C08K; C08K5/00; C08K5/49; C08K5/51; C08K5/52; C08K5/524; D01F1/00; D01F1/02; D01F1/10
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
39 words
IN THE PROCESS OF PRODUCING SHAPED ARTICLES BY SHAPING A LINEAR POLYCARBONATE OF DI-(4-HYDROXY PHENYL)-2,2PROPANE FROM ITS SOLUTION, THE IMPROVEMENT WHICH COMPRISES MIXING WITH SAID POLYCARBONATE SOLUTION, PRIOR TO THE SHAPING THEREOF, A PHOSPHOROUS ACID ESTER OF THE FORMULA
Claim 2
Dependent Claim
39 words
IN THE PROCESS OF PRODUCING SHAPED ARTICLES BY SHAPING A LINEAR POLYCARBONATE OF DI-(4-HYDROXY PHENYL)-2,2PROPANE FROM ITS SOLUTION, THE IMPROVEMENT WHICH COMPRISES MIXING WITH SAID POLYCARBONATE SOLUTION, PRIOR TO THE SHAPING THEREOF, A PHOSPHOROUS ACID ESTER OF THE FORMULA
References Cited (Backward Citations)
US3021340A
Cited
GB828523A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1970-02-27 | 1970-08-29 | 1971-02-28 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1974-02-27 | 1974-08-29 | 1975-02-28 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1978-02-27 | 1978-08-29 | 1979-02-28 | $7700.00 | Window Closed / Lapsed |