US3470239A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Process for preparing methacrylic acid and its esters from isobutane
Assignee: Halcon Research and Development Corp
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Filing: 1968-06-07
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Granted: 1969-09-30
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Expires: 1988-06-07
Abstract
No abstract record available.
Inventors
- 👤 Joseph L Russell
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-01 16:26
CPC Classifications
C; C07; C07C; C07C409/00; C07C409/02; C07C409/04; C07C29/00; C07C29/132; C07C407/00; C07C45/00; C07C45/27; C07C45/32; C07C45/33; C07C45/34; C07C45/35; C07C45/37; C07C51/00; C07C51/16; C07C51/285
Claims Analysis
Total Claims: 0
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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) | 1972-09-29 | 1973-03-31 | 1973-09-30 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1976-09-29 | 1977-03-31 | 1977-09-30 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1980-09-29 | 1981-03-31 | 1981-09-30 | $7700.00 | Window Closed / Lapsed |