US3548722A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Manufacture of valve bags
Assignee: PPG Architectural Coatings Canada Inc
•
Filing: 1968-08-16
•
Granted: 1970-12-22
•
Expires: 1988-08-16
Abstract
No abstract record available.
Inventors
- 👤 Elwyn David Jones
- 👤 Edward Kenneth Rowley
- 👤 Douglas Reynolds Shepherd
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 19:50
CPC Classifications
B; B31; B31D; B31D5/00; B31D5/0034; B31B; B31B2150/00; B31B2160/00; B31B2160/20; B31B70/00; B31B70/74; B31B70/81; B31B70/84; B31B70/844
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
No citation records indexed.
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1973-12-21 | 1974-06-22 | 1974-12-22 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1977-12-21 | 1978-06-22 | 1978-12-22 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1981-12-21 | 1982-06-22 | 1982-12-22 | $7700.00 | Window Closed / Lapsed |