Patent US3131675A successfully refreshed from Google Patents.
US3131675A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Writing instrument
Assignee: Individual
•
Filing: 1962-03-12
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Granted: 1964-05-05
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Expires: 1982-03-12
Abstract
No abstract record available.
Inventors
- 👤 Emil S Wieszeck
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-04 11:09
CPC Classifications
B; B43; B43K; B43K29/00; B43K29/08
Claims Analysis
Total Claims: 1
Claim 1
Independent Claim
93 words
IN A WRITING INSTRUMENT, AN ELONGATED BODY EQUIPPED WITH A RECIPROCATORY MECHANISM FOR EXTENSION OF A WRITING POINT AT ONE END THEREOF AND ALSO EQUIPPED WITH A TRANSPARENT WALL PORTION, MEANS IN SAID BODY ALIGNED WITH SAID TRANSPARENT WALL PORTION SENSITIVE TO CHANGE IN HUMIDITY IN THE AIR SURROUNDING THE INSTRUMENT TO CHANGE THE APPEARANCE OF SAID MEANS AND THEREBY GIVE A SIGNAL VISIBLE THROUGH SAID TRANSPARENT WALL PORTION, AND MEANS ASSOCIATED WITH THE RECIPROCATORY MECHANISM FOR FLOWING A PORTION OF THE SURROUNDING AIR PAST SAID HUMIDITY-SENSITIVE MEANS UPON ACTUATION OF SAID MECHANISM.
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) | 1967-05-05 | 1967-11-04 | 1968-05-05 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1971-05-05 | 1971-11-04 | 1972-05-05 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1975-05-05 | 1975-11-04 | 1976-05-05 | $7700.00 | Window Closed / Lapsed |