US3115477A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Stabilized cyclic anhydride compositions
Assignee: Petro Tex Chemical Corp
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Filing: 1962-03-29
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Granted: 1963-12-24
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Expires: 1982-03-29
Abstract
No abstract record available.
Inventors
- 👤 William G Bowman
- 👤 Jr Thomas G Reed
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-29 23:00
CPC Classifications
C; C07; C07C; C07C51/00; C07C51/54; C07C51/573
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
19 words
A COMPOSITION OF MATTER COMPRISING MALEIC ANHYDRIDE AND ABOUT 10 TO ABOUT 1,000 PARTS PER MILLION OF THIODIPROPIONIC ACID.
Claim 2
Dependent Claim
56 words
A COMPOSITION OF MATTER COMPRISING MATERIALS SELECTED FROM THE GROUP CONSISTING OF MALEIC ANHYDRIDE, HEXAHYDROPHTHALIC ANHYDRIDE, TETRAHYDROPHTHALIC ANHYDRIDE, MALEIC ACID, FUMARIC ACID AND SUCCINIC ACID CONTAINING A COLOR STABILIZING AMOUNT OF A COMPOUND OF THE FORMULA ROOCCH2CH2-S-CH2CH2COOR, WHEREIN R IS SELECTED FROM THE GROUP CONSISTING OF HYDROGEN AND ALKYL RADICALS CONTAINING 1 TO 12 CARBON TOMS.
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) | 1966-12-23 | 1967-06-24 | 1967-12-24 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1970-12-23 | 1971-06-24 | 1971-12-24 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1974-12-23 | 1975-06-24 | 1975-12-24 | $7700.00 | Window Closed / Lapsed |