Patent US3072102A successfully refreshed from Google Patents.
US3072102A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Mechanical pencil
Assignee: Individual
•
Filing: 1957-04-24
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Granted: 1963-01-08
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Expires: 1977-04-24
Abstract
No abstract record available.
Inventors
- 👤 Frank T Johmann
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-01 21:26
CPC Classifications
B; B43; B43K; B43K21/00; B43K21/02; B43K21/08; B43K21/10
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
140 words
A MECHANICAL PENCIL COMPRISING A BARREL INCLUDING AN UPPER BARREL PORTION AND A LOWER BARREL PORTION OPEN AT ITS WRITING END, A LEAD GUIDE TUBE MOUNTED WITHIN SAID BARREL FOR LONGITUDINAL MOVEMENT AND NORMALLY PROJECTING THROUGH THE OPEN WRITING END OF SAID LOWER BARREL PORTION, SPRING MEANS DISPOSED WITHIN SAID BARREL AND ADAPTED TO URGE SAID LEAD GUIDE TUBE TO A POSITION PROJECTING THROUGH SAID OPEN LOWER BARREL PORTION, GUIDE MEANS FOR PREVENTING THE ROTARY MOVEMENT OF SAID LEAD GUIDE TUBE RELATIVE TO SAID LOWER BARREL PORTION, A LEAD FOLLOWER LONGITUDINALLY MOVABLE WITHIN SAID LEAD GUIDE TUBE, A HELICAL GUIDEWAY FIXED AGAINST ROTATION RELATIVE TO SAID LOWER BARREL PORTION AND ENGAGING SAID LEAD FOLLOWER, AND A MECHANISM FOR CAUSING ROTATION OF SAID LEAD FOLLOWER RELATIVE TO SAID HELICAL GUIDEWAY WHEREBY SAID LEAD FOLLOWER IS LONGITUDINALLY MOVED WITHIN SAID LEAD GUIDE
Claim 2
Dependent Claim
140 words
A MECHANICAL PENCIL COMPRISING A BARREL INCLUDING AN UPPER BARREL PORTION AND A LOWER BARREL PORTION OPEN AT ITS WRITING END, A LEAD GUIDE TUBE MOUNTED WITHIN SAID BARREL FOR LONGITUDINAL MOVEMENT AND NORMALLY PROJECTING THROUGH THE OPEN WRITING END OF SAID LOWER BARREL PORTION, SPRING MEANS DISPOSED WITHIN SAID BARREL AND ADAPTED TO URGE SAID LEAD GUIDE TUBE TO A POSITION PROJECTING THROUGH SAID OPEN LOWER BARREL PORTION, GUIDE MEANS FOR PREVENTING THE ROTARY MOVEMENT OF SAID LEAD GUIDE TUBE RELATIVE TO SAID LOWER BARREL PORTION, A LEAD FOLLOWER LONGITUDINALLY MOVABLE WITHIN SAID LEAD GUIDE TUBE, A HELICAL GUIDEWAY FIXED AGAINST ROTATION RELATIVE TO SAID LOWER BARREL PORTION AND ENGAGING SAID LEAD FOLLOWER, AND A MECHANISM FOR CAUSING ROTATION OF SAID LEAD FOLLOWER RELATIVE TO SAID HELICAL GUIDEWAY WHEREBY SAID LEAD FOLLOWER IS LONGITUDINALLY MOVED WITHIN SAID LEAD GUIDE
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) | 1966-01-07 | 1966-07-09 | 1967-01-08 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1970-01-07 | 1970-07-09 | 1971-01-08 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1974-01-07 | 1974-07-09 | 1975-01-08 | $7700.00 | Window Closed / Lapsed |