US3374301A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Method of thermoforming alkenyl aromatic resinous sheet
Assignee: Dow Chemical Co
•
Filing: 1965-06-01
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Granted: 1968-03-19
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Expires: 1985-06-01
Abstract
No abstract record available.
Inventors
- 👤 Earl F Engles
- 👤 William R R Park
- 👤 Donald A Shmidt
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-03 19:18
CPC Classifications
B; B29; B29C; B29C51/00; B29C51/26; B29C51/30; B29C51/34; B29C51/346; B29B; B29B13/00; B29B13/02; B29B13/023; B29C51/002
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
93 words
IN THE THERMOFORMING OF ORIENTED ALKENYL AROMATIC RESINOUS SHEET WHEREIN SAID SHEET IS HEATED TO A THERMOPLASTIC TEMPERATURE, CONFORMED TO A MOLD OR FORM AND SUBSEQUENTLY COOLED TO PROVIDE A RIGID SHAPED SHEET, THE IMPROVEMENT WHICH COMPRISES APPLYING TO SAID SHEET PRIOR TO THERMOFORMING A COATING COMPRISING A WATER DISPERSION OF A SALT SELECTED FROM THE GROUP CONSISTING OF POTASSIUM OR SODIUM OLEATE AND MIXTURES THEREOF, EVAPORATING THE WATER FROM THE SURFACE OF THE ALKENYL AROMATIC RESINOUS SHEET TO DEPOSIT THEREON A SUBSTANTIALLY CONTINUOUS COATING OF THE SALT, AND SUBSEQUENTLY THERMOFORMING SAID SHEET.
Claim 2
Dependent Claim
93 words
IN THE THERMOFORMING OF ORIENTED ALKENYL AROMATIC RESINOUS SHEET WHEREIN SAID SHEET IS HEATED TO A THERMOPLASTIC TEMPERATURE, CONFORMED TO A MOLD OR FORM AND SUBSEQUENTLY COOLED TO PROVIDE A RIGID SHAPED SHEET, THE IMPROVEMENT WHICH COMPRISES APPLYING TO SAID SHEET PRIOR TO THERMOFORMING A COATING COMPRISING A WATER DISPERSION OF A SALT SELECTED FROM THE GROUP CONSISTING OF POTASSIUM OR SODIUM OLEATE AND MIXTURES THEREOF, EVAPORATING THE WATER FROM THE SURFACE OF THE ALKENYL AROMATIC RESINOUS SHEET TO DEPOSIT THEREON A SUBSTANTIALLY CONTINUOUS COATING OF THE SALT, AND SUBSEQUENTLY THERMOFORMING SAID SHEET.
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USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1971-03-19 | 1971-09-18 | 1972-03-19 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1975-03-19 | 1975-09-18 | 1976-03-19 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1979-03-19 | 1979-09-18 | 1980-03-19 | $7700.00 | Window Closed / Lapsed |