Patent US3528809A successfully refreshed from Google Patents.
US3528809A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Hollow article production
Assignee: Canadian Patents and Development Ltd
•
Filing: 1966-04-07
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Granted: 1970-09-15
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Expires: 1986-04-07
Abstract
No abstract record available.
Inventors
- 👤 Joseph Redmond Farnand
- 👤 Ira Edwin Puddington
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-24 21:49
CPC Classifications
B; B01; B01J; B01J2/00; B22; B22F; B22F1/00; B22F1/06; B22F1/065; B22F1/0655; Y; Y10; Y10S; Y10S264/00; Y10S264/44; Y10S428/00; Y10S428/922; Y10S428/923; Y10S428/924; Y10S428/926; Y10S75/00; Y10S75/953; Y10T; Y10T428/00; Y10T428/12
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) | 1973-09-14 | 1974-03-16 | 1974-09-15 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1977-09-14 | 1978-03-16 | 1978-09-15 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1981-09-14 | 1982-03-16 | 1982-09-15 | $7700.00 | Window Closed / Lapsed |