US2736723A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Mercaptan modified hydrocarbon polymers
Assignee: Armstrong World Industries Inc
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Filing: 1953-03-24
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Granted: 1956-02-28
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Expires: 1973-03-24
Abstract
No abstract record available.
Inventors
- 👤 Frederick W Breuer
- 👤 Burt F Hofferth
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-27 11:57
CPC Classifications
C; C08; C08F; C08F8/00; C08F8/34
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
69 words
A METHOD OF CONVERTING HARD, BRITTLE HYDROCARBON RESINS OF THE GROUP CONSISTING OF POLYSTYRENE, POLYMETHYL STYRENE, RESINS OBTAINED BY POLYMERIZATION OF PETROLEUM FRACTIONS RICH IN UNSATURATES, AND RESINS OBTAINED FROM COAL TAR TO USEFUL LOWER MOLECULAR WEIGHT PLASTICIZER PRODUCTS WHICH COMPRISES HEATING THE HYDROCARBON IN THE PRESENCE OF A COMPOUND OF THE GROUP CONSISTING OF HIGHER ALKYL MERCAPTANS AND AROMATIC MERCAPTANS AND SEPARATING EXCESS MERCAPTANS FROM THE REACTION MASS.
Claim 2
Independent Claim
69 words
A METHOD OF CONVERTING HARD, BRITTLE HYDROCARBON RESINS OF THE GROUP CONSISTING OF POLYSTYRENE, POLYMETHYL STYRENE, RESINS OBTAINED BY POLYMERIZATION OF PETROLEUM FRACTIONS RICH IN UNSATURATES, AND RESINS OBTAINED FROM COAL TAR TO USEFUL LOWER MOLECULAR WEIGHT PLASTICIZER PRODUCTS WHICH COMPRISES HEATING THE HYDROCARBON IN THE PRESENCE OF A COMPOUND OF THE GROUP CONSISTING OF HIGHER ALKYL MERCAPTANS AND AROMATIC MERCAPTANS AND SEPARATING EXCESS MERCAPTANS FROM THE REACTION MASS.
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) | 1959-02-27 | 1959-08-29 | 1960-02-28 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1963-02-27 | 1963-08-29 | 1964-02-28 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1967-02-27 | 1967-08-29 | 1968-02-28 | $7700.00 | Window Closed / Lapsed |