Patent US3260776A successfully refreshed from Google Patents.
US3260776A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Production of biaxially stretch oriented polypropylene film
Assignee: WR Grace and Co
•
Filing: 1964-10-29
•
Granted: 1966-07-12
•
Expires: 1984-10-29
Abstract
No abstract record available.
Inventors
- 👤 Jr Carl A Lindstrom
- 👤 Jr William G Baird
- 👤 Jr Arthur L Besse
- 👤 Entremont Donald J D
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-24 20:51
CPC Classifications
B; B29; B29C; B29C48/00; B29C48/03; B29C48/001; B29C48/0018; B29C48/0019; B29C48/09; B29C48/10; Y; Y10; Y10S; Y10S428/00; Y10S428/91; Y10T; Y10T428/00; Y10T428/13; Y10T428/1352; Y10T428/1379; Y10T428/139
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
77 words
A METHOD OF MAKING AN ORIENTED TUBULAR ARTICLE OF ISOTACTIC POLYPROPYLENE WHICH CONSIISTS OF MELT EXTRUDING A TUBE OF SAID POLYMER, IMMERSING AND QUENCHING SAID EXTRUDED TUBE IN A BATH OF A NON-SOLVENT LIQUID FOR SAID POLYMER AT A TEMPERATURE OF ABOUT 7 TO 10*C. AND AT A DISTANCE OF FROM 1/8 TO A 4 INCHES FROM THE DIE HEATING SAID QUENCHED TUBE TO A TEMPERATURE WITHIN ITS SOFTENING RANGE AND BIAXIALLY STRETCHING SAID HEAT SOFTENED TUBE.
Claim 2
Independent Claim
77 words
A METHOD OF MAKING AN ORIENTED TUBULAR ARTICLE OF ISOTACTIC POLYPROPYLENE WHICH CONSIISTS OF MELT EXTRUDING A TUBE OF SAID POLYMER, IMMERSING AND QUENCHING SAID EXTRUDED TUBE IN A BATH OF A NON-SOLVENT LIQUID FOR SAID POLYMER AT A TEMPERATURE OF ABOUT 7 TO 10*C. AND AT A DISTANCE OF FROM 1/8 TO A 4 INCHES FROM THE DIE HEATING SAID QUENCHED TUBE TO A TEMPERATURE WITHIN ITS SOFTENING RANGE AND BIAXIALLY STRETCHING SAID HEAT SOFTENED TUBE.
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) | 1969-07-11 | 1970-01-10 | 1970-07-12 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1973-07-11 | 1974-01-10 | 1974-07-12 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1977-07-11 | 1978-01-10 | 1978-07-12 | $7700.00 | Window Closed / Lapsed |