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US3262145A Expired / Lapsed US ⏱️ 0.0 years remaining

Blackboard eraser

Assignee: Progressive Products Corp
•
Filing: 1965-09-20
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Granted: 1966-07-26
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Expires: 1985-09-20
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Abstract

No abstract record available.

Inventors

  • 👤 Gilbert F Carlson

Bibliographic Details

Application Number —
Jurisdiction US
Data Source google_patents
Last Synchronized 2026-11-04 20:47
CPC Classifications
B; B43; B43L; B43L21/00

Claims Analysis

Total Claims: 0
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References Cited (Backward Citations)

US2186050A Cited
US2249912A Cited
US2303759A Cited
US2313787A Cited
US2731658A Cited
US2962746A Cited
US3081479A Cited

USPTO Annuity & Maintenance Windows

Annuity Stage Window Opens Payment Deadline Surcharge Period Until Estimated Fee Status
3.5 Years (Year 4) 1969-07-25 1970-01-24 1970-07-26 $2000.00 Window Closed / Lapsed
7.5 Years (Year 8) 1973-07-25 1974-01-24 1974-07-26 $3760.00 Window Closed / Lapsed
11.5 Years (Year 12) 1977-07-25 1978-01-24 1978-07-26 $7700.00 Window Closed / Lapsed

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