Patent US3425979A successfully refreshed from Google Patents.
US3425979A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Process for the blow extrusion of polyvinyl alcohol films
Assignee: Air Products and Chemicals Inc
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Filing: 1967-01-03
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Granted: 1969-02-04
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Expires: 1987-01-03
Abstract
No abstract record available.
Inventors
- 👤 Leo J Monaghan
- 👤 Vincent A Aliberti
- 👤 Daniel M Sullivan
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 20:54
CPC Classifications
C; C08; C08K; C08K5/00; C08K5/04; C08K5/06; B; B29; B29C; B29C48/00; B29C48/001; B29C48/0018; B29C48/0019; B29C48/03; B29C48/09; B29C48/10
Claims Analysis
Total Claims: 0
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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) | 1972-02-04 | 1972-08-05 | 1973-02-04 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1976-02-04 | 1976-08-05 | 1977-02-04 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1980-02-04 | 1980-08-05 | 1981-02-04 | $7700.00 | Window Closed / Lapsed |