Patent US3535707A successfully refreshed from Google Patents.
US3535707A
Expired / Lapsed
US
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Welding helmet and the like
Assignee: Trison Corp
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Filing: 1969-03-03
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Granted: 1970-10-27
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Expires: 1989-03-03
Abstract
No abstract record available.
Inventors
- 👤 Harry R Greenlee
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-28 23:31
CPC Classifications
A; A61; A61F; A61F9/00; A61F9/04; A61F9/06; A61F9/068
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) | 1973-10-26 | 1974-04-27 | 1974-10-27 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1977-10-26 | 1978-04-27 | 1978-10-27 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1981-10-26 | 1982-04-27 | 1982-10-27 | $7700.00 | Window Closed / Lapsed |