Patent US2806878A successfully refreshed from Google Patents.
US2806878A
Expired / Lapsed
US
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Acrylic acid preparation
Assignee: Wyeth Holdings LLC
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Filing: 1955-11-04
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Granted: 1957-09-17
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Expires: 1975-11-04
Abstract
No abstract record available.
Inventors
- 👤 Benjamin J Luberoff
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-04 18:35
CPC Classifications
C; C07; C07C; C07C51/00; C07C51/09
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
33 words
IN THE PROCESS OF PREPARING ACRYLIC ACID FROM HOMOPOLYMERIC ESTERS THEREOF THE STEPS WHICH COMPRISES: ADDING A SMALL AMOUNT OF NON-VOLATILE FRIEDEL-CRAFTS TYPE CATALYST TO A HOMOPOLYMERIC ACRYLIC ESTER REPRESENTED BY THE FORMULA:
Claim 2
Dependent Claim
33 words
IN THE PROCESS OF PREPARING ACRYLIC ACID FROM HOMOPOLYMERIC ESTERS THEREOF THE STEPS WHICH COMPRISES: ADDING A SMALL AMOUNT OF NON-VOLATILE FRIEDEL-CRAFTS TYPE CATALYST TO A HOMOPOLYMERIC ACRYLIC ESTER REPRESENTED BY THE FORMULA:
References Cited (Backward Citations)
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1960-09-16 | 1961-03-18 | 1961-09-17 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1964-09-16 | 1965-03-18 | 1965-09-17 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1968-09-16 | 1969-03-18 | 1969-09-17 | $7700.00 | Window Closed / Lapsed |