Patent US2988783A successfully refreshed from Google Patents.
US2988783A
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Method of producing elongated structures of isotactic polystyrene
Assignee: Union Carbide Corp
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Filing: 1959-10-14
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Granted: 1961-06-20
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Expires: 1979-10-14
Abstract
No abstract record available.
Inventors
- 👤 Walter A Miller
- 👤 Jr Charles N Merriam
- 👤 Stephen O Cook
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-01 22:07
CPC Classifications
D; D01; D01D; D01D5/00; D01D5/08; D01F; D01F6/00; D01F6/02; D01F6/20; D01F6/22; Y; Y10; Y10S; Y10S8/00; Y10S8/09; Y10S8/10
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
79 words
METHOD OF PRODUCING ELONGATED STRUCTURES OF ISOTACSTIC POLYSTYRENE HAVING IMPROVED CHEMICAL AND PHYSICAL PROPERTIES WHICH COMPRISES STRETCHING SAID STRUCTURE TO EFFECT A PERCENT STRETCH OF FROM ABOUT 300 TO ABOUT 650 PERCENT AT A TEMPERATURE OF ABOUT 115*C. TO ABOUT 130* C., AND THEREAFTER SUBJECTING THE INITIALLY STRETCHED POLYSTYRENE STRUCTURE TO A SECOND STRETCHING OPERATION AT A TEMPERATURE FROM ABOUT 125*C. TO ABOUT 150*C., WHEREBY THE TOTAL STRETCH EFFECTED IN THE SAID STRUCTURE IS AT LEAST ABOUT 750 PERCENT.
Claim 2
Dependent Claim
79 words
METHOD OF PRODUCING ELONGATED STRUCTURES OF ISOTACSTIC POLYSTYRENE HAVING IMPROVED CHEMICAL AND PHYSICAL PROPERTIES WHICH COMPRISES STRETCHING SAID STRUCTURE TO EFFECT A PERCENT STRETCH OF FROM ABOUT 300 TO ABOUT 650 PERCENT AT A TEMPERATURE OF ABOUT 115*C. TO ABOUT 130* C., AND THEREAFTER SUBJECTING THE INITIALLY STRETCHED POLYSTYRENE STRUCTURE TO A SECOND STRETCHING OPERATION AT A TEMPERATURE FROM ABOUT 125*C. TO ABOUT 150*C., WHEREBY THE TOTAL STRETCH EFFECTED IN THE SAID STRUCTURE IS AT LEAST ABOUT 750 PERCENT.
References Cited (Backward Citations)
US2556295A
Cited
US2900220A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1964-06-19 | 1964-12-19 | 1965-06-20 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1968-06-19 | 1968-12-19 | 1969-06-20 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1972-06-19 | 1972-12-19 | 1973-06-20 | $7700.00 | Window Closed / Lapsed |