US3393597A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Masking device
Assignee: HELPS CO
•
Filing: 1966-07-11
•
Granted: 1968-07-23
•
Expires: 1986-07-11
Abstract
No abstract record available.
Inventors
- 👤 Paul A Hoaglund
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-06 03:03
CPC Classifications
C; C25; C25D; C25D11/00; C25D11/02; C25D11/022
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US1422964A
Cited
US1826988A
Cited
US2358151A
Cited
US2726009A
Cited
US2820757A
Cited
GB933050A
Cited
US3273441A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1971-07-23 | 1972-01-22 | 1972-07-23 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1975-07-23 | 1976-01-22 | 1976-07-23 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1979-07-23 | 1980-01-22 | 1980-07-23 | $7700.00 | Window Closed / Lapsed |