Patent US3100889A successfully refreshed from Google Patents.
US3100889A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Apparatus for sensing variations
Assignee: International Business Machines Corp
•
Filing: 1958-04-17
•
Granted: 1963-08-13
•
Expires: 1978-04-17
Abstract
No abstract record available.
Inventors
- 👤 Maxwell R Cannon
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 10:51
CPC Classifications
B; B65; B65H; B65H23/00; B65H23/02; B65H23/0204; B65H23/0208; B65H23/04; B65H23/34; G; G01; G01B; G01B7/00; G01B7/02; G01B7/04; G01B7/048; G06; G06K; G06K19/00; G06K19/02; G06K19/022
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
176 words
IN A WEB WIDTH SENSING SYSTEM, IN COMBINATION, A SOURCE OF ALTERNATING WAVES, A PAIR OF DIFFERENTIALLY CONNECTED LINEARLY VARIABLE DIFFERENTIAL TRANSFORMERS CONNECTED TO SAID SOURCE, EACH SAID TRANSFORMER HAVING A MOVABLE MAGNETIC CORE NORMALLY LOCATED IN A NULL POSITION SUCH THAT NO OUTPUT IS PRODUCED BY EITHER TRANSFORMER WHILE THE CORES ARE IN THE NULL POSITIONS, BEARING MEMBERS RIGIDLY ATTACHED RESPECTIVELY TO SAID MOVABLE CORES, MEANS FOR PASSING A MOVING WEB BETWEEN SAID BEARING MEMBERS, MEANS SUPPORTING SAID BEARING MEMBERS WITH SAID BEARING MEMBERS FREE TO FOLLOW THE EDGES OF SAID WEB, MEANS FOR DERIVING AN OUTPUT FROM SAID TRANSFORMERS HAVING AN AMPLITUDE WHICH IS A FUNCTION OF A CHANGE IN THE WIDTH OF SAID WEB FROM A PREDETERMINED VALUE WITH SAID OUTPUT SUBSTANTIALLY INDEPENDENT OF LATERAL MOTION OF SAID WEB, MEANS COUPLED TO SAID SOURCE FOR PROVIDING A STEADY REFERENCE VOLTAGE, MEANS FOR COMPARING SAID OUTPUT AND SAID REFERENCE VOLTAGE AND FOR PROVIDING THEREFROM PERIODIC PULSES REPRESENTATIVE ONLY OF ANY EXCESS OF SAID OUTPUT OVER SAID REFERENCE VOLTAGE, MEANS FOR INTEGRATING GROUPS OF SAID
Claim 2
Dependent Claim
176 words
IN A WEB WIDTH SENSING SYSTEM, IN COMBINATION, A SOURCE OF ALTERNATING WAVES, A PAIR OF DIFFERENTIALLY CONNECTED LINEARLY VARIABLE DIFFERENTIAL TRANSFORMERS CONNECTED TO SAID SOURCE, EACH SAID TRANSFORMER HAVING A MOVABLE MAGNETIC CORE NORMALLY LOCATED IN A NULL POSITION SUCH THAT NO OUTPUT IS PRODUCED BY EITHER TRANSFORMER WHILE THE CORES ARE IN THE NULL POSITIONS, BEARING MEMBERS RIGIDLY ATTACHED RESPECTIVELY TO SAID MOVABLE CORES, MEANS FOR PASSING A MOVING WEB BETWEEN SAID BEARING MEMBERS, MEANS SUPPORTING SAID BEARING MEMBERS WITH SAID BEARING MEMBERS FREE TO FOLLOW THE EDGES OF SAID WEB, MEANS FOR DERIVING AN OUTPUT FROM SAID TRANSFORMERS HAVING AN AMPLITUDE WHICH IS A FUNCTION OF A CHANGE IN THE WIDTH OF SAID WEB FROM A PREDETERMINED VALUE WITH SAID OUTPUT SUBSTANTIALLY INDEPENDENT OF LATERAL MOTION OF SAID WEB, MEANS COUPLED TO SAID SOURCE FOR PROVIDING A STEADY REFERENCE VOLTAGE, MEANS FOR COMPARING SAID OUTPUT AND SAID REFERENCE VOLTAGE AND FOR PROVIDING THEREFROM PERIODIC PULSES REPRESENTATIVE ONLY OF ANY EXCESS OF SAID OUTPUT OVER SAID REFERENCE VOLTAGE, MEANS FOR INTEGRATING GROUPS OF SAID
References Cited (Backward Citations)
US2289737A
Cited
US2410249A
Cited
US2503851A
Cited
US2564221A
Cited
US2569228A
Cited
US2648058A
Cited
GB748612A
Cited
US2903522A
Cited
US2824299A
Cited
US2848815A
Cited
US2876551A
Cited
US2909623A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1966-08-12 | 1967-02-11 | 1967-08-13 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1970-08-12 | 1971-02-11 | 1971-08-13 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1974-08-12 | 1975-02-11 | 1975-08-13 | $7700.00 | Window Closed / Lapsed |