Patent US3515780A successfully refreshed from Google Patents.
US3515780A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Process for drying gel-regenerated cellulose film
Assignee: Shawmut Capital Corp
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Filing: 1967-03-21
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Granted: 1970-06-02
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Expires: 1987-03-21
Abstract
No abstract record available.
Inventors
- 👤 William Grogan O'connell
- 👤 Herbert Brooks Sanford Jr
- 👤 Bernard S Edwards
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-25 20:22
CPC Classifications
B; B29; B29D; B29D7/00; B29C; B29C71/00
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
CA538979A
Cited
US2115132A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1973-06-01 | 1973-12-01 | 1974-06-02 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1977-06-01 | 1977-12-01 | 1978-06-02 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1981-06-01 | 1981-12-01 | 1982-06-02 | $7700.00 | Window Closed / Lapsed |