US3305542A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Polyethers of levoglucosan
Assignee: Weyerhaeuser Co
•
Filing: 1965-03-25
•
Granted: 1967-02-21
•
Expires: 1985-03-25
Abstract
No abstract record available.
Inventors
- 👤 Lawrence G Carlberg
- 👤 Shafizadeh Fraidoun
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-05 14:58
CPC Classifications
C; C07; C07H; C07H19/00; C07H19/01; C08; C08G; C08G18/00; C08G18/06; C08G18/28; C08G18/40; C08G18/48; C08G18/487; C08G18/4883
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
24 words
THE REACTION PRODUCT OF LEVOGLUCOSAN AND AN ALKYLENE OXIDE SELECTED FROM THE GROUP CONSISTING OF ETHYLENE OXIDE, PROPYLENE OXIDE, BUTYLENE OXIDE, AND MIXTURES THEREOF.
Claim 2
Dependent Claim
24 words
THE REACTION PRODUCT OF LEVOGLUCOSAN AND AN ALKYLENE OXIDE SELECTED FROM THE GROUP CONSISTING OF ETHYLENE OXIDE, PROPYLENE OXIDE, BUTYLENE OXIDE, AND MIXTURES THEREOF.
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) | 1970-02-20 | 1970-08-22 | 1971-02-21 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1974-02-20 | 1974-08-22 | 1975-02-21 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1978-02-20 | 1978-08-22 | 1979-02-21 | $7700.00 | Window Closed / Lapsed |