US3268486A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Process for preparing polyesters
Assignee: Shell USA Inc
•
Filing: 1964-04-30
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Granted: 1966-08-23
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Expires: 1984-04-30
Abstract
No abstract record available.
Inventors
- 👤 Klootwijk Arie
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 13:43
CPC Classifications
A; A61; A61K; A61K39/00; A61K39/02; A61K39/04; C; C08; C08G; C08G63/00; C08G63/78; C08G63/82; C08G63/823; C12; C12N; C12N1/00; C12N1/04; C12N1/20; C12N1/36
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
22 words
A PROCESS FOR PREPARING POLYESTERS HAVING A MOLECULAR WEIGHT OF FROM 15,000 TO 200,000 AND WHICH ARE REPSENTED BY THE REPEATING UNIT
Claim 2
Dependent Claim
22 words
A PROCESS FOR PREPARING POLYESTERS HAVING A MOLECULAR WEIGHT OF FROM 15,000 TO 200,000 AND WHICH ARE REPSENTED BY THE REPEATING UNIT
References Cited (Backward Citations)
US3021310A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1969-08-22 | 1970-02-21 | 1970-08-23 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1973-08-22 | 1974-02-21 | 1974-08-23 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1977-08-22 | 1978-02-21 | 1978-08-23 | $7700.00 | Window Closed / Lapsed |